Satellite and Spacecraft Radio Transmission Frequencies

This frequency list includes satellites and spacecraft tracked from the Zarya home location, with additional information from other observers that is credited appropriately. Some of the frequencies have been used by past satellites but generally only transmissions logged since the year 2000 are listed here.

Satellite and launch vehicle series tend to use frequencies repetitively so to see what might be coming up, there is a launch calendar that can be found in the Go For Launch! section (also available from the right hand menu).

NOTE: All frequencies based on observations from the Zarya location are Doppler corrected to give the true transmission frequency. Where another source gives a frequency near to, but different from, a frequency listed here, it is probably a received frequency which includes a Doppler shift.

Specifically excluded from being listed are amateur radio satellites, the US military VHF communications transponders near 250 MHz aboard geosynchronous satellites, and the plethora of transmitters near 435 MHz.



Acknowledgements

Identification of transmitting satellites for which SpaceTrack does not publish orbital elements is very dependent on the work of visual observers and people like Mike McCants who has spent the last 20 years computing orbital elements from the observations. Much of the effort is facilitated by the existence of the Seesat-L online visual satellite observing community. Their observational work is gratefully acknowledged.



Frequencies

In the menu on the left are some selective versions of the list for satellites in particular categories. There is also a list covering the now-defunct HF frequencies from earlier times in the space age.



Freq (MHz) Satellite Transmission Notes 121.500 Soyuz

TMA-M

Morse code 'AN' recovery beacon and direction finding for recovery teams ISS Crew ferry: Digital control system, three crew seats, from 2011 - NOTE: this is an international distress frequency 121.750 Soyuz

TMA-M

30 kHz deviation FM voice ISS Crew ferry: Digital control system, three crew seats, from 2011 130.167 ISS 1998-067A

25544 Medium bandwidth FM voice Space station: VHF-2 channel for Russian segment, used as an alternative to VHF-1 (143.625 MHz) during Shuttle/ISS on-orbit operations 130.167 ISS 1998-067A

25544 Ranging pulses Space station: Used by TORU remote control docking system on the Russian segment, usually tested 1-2 days before a Progress docking is due, the Progress return path is at 121.750 MHz 136.235 TIROS 10 1965-051A

1430 AM - 1.3 kHz tone Meteorology: Payload now inactive, radio transmission is not continuous - (information contributed by Michael D Kenny) 136.260 ERS 20 1967-040D

2768 AM - tone (unstable) USAF test satellite: High orbit, visible for long periods of time - (information contributed by Michael D Kenny) 136.410 Isis 1 1969-009A

3669 CW Ionosphere studies: (information contributed by Michael D Kenny) 136.440 ERS 15 1966-077C

2412 AM with 1.3 kHz tone Military satellite: Incorrectly catalogued by NORAD as SECOR 7 - (information contributed by Michael D Kenny) 136.500 Nimbus 4 1970-025A

4362 CW - sometimes modulated Meteorology (including imaging): Payload no longer operational - (information contributed by Michael D Kenny) 136.650 NNS O-2 1964-083D

965 CW Carrier plus telemetry tones Navigation: Second operational TRANSIT navsat, navigation system failed soon after launch but transmitter is still active (information contributed by Michael D Kenny) 136.695 Shinsei 1971-080A

5485 CW Japanese scientific satellite: Continuous transmission - (information contributed by Michael D Kenny) 136.770 NOAA 9 1984-123A

15427 CW Formerly meteorological imaging: Telemetry frequency, transmission is intermittent - (information contributed by Michael D Kenny) - Also has a transmission at 137.500 MHz 136.800 Solrad 7B 1965-016D

1291 AM IRIG telemetry channels Solar radiation studies (launched 1969): Continuous transmission - (information contributed by Michael D Kenny) 137.080 OPS 7898-2 1971-110C

5680 CW US military satellite: (information contributed by Michael D Kenny) 137.100 NOAA 18 2005-018A

28654 APT at 4 lines per second - interlaced visible light and infrared images Meteorological imaging: Revised frequency as of 2006 Jan 4, changed from 137.9125 MHz 137.142 Eutelsat I

F4 1987-078B

18351 CW Comms: Regular, intermittent signal possibly due to vehicle rotation causing periodic flow of power from solar panels 137.200 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies,individual satellites switch between them - Also transmits at 400.100 MHz 137.225 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies,individual satellites switch between them - Also transmits at 400.100 MHz 137.250 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies,individual satellites switch between them - Also transmits at 400.100 MHz 137.300 Russian

Imaging

APT at 2 lines per second Meteorological and remote sensing imaging: Frequency not currently active 137.350 NOAA 15 1998-030A

25338 CW Doppler Beacon and telemetry Meteorological imaging: Continuous transmission -(information contributed by Michael D Kenny) - Also transmits at 137.500 MHz 137.350 NOAA 16 2000-055A

26536 CW Doppler Beacon and telemetry Formerly meteorological imaging: Continuous transmission -(information contributed by Michael D Kenny) - Also transmits at 137.500 MHz 137.350 Compass 2 2006-019A

29157 CW/AM Russian scientific satellite studying possible ways of predicting earthquakes - not operating properly: After launch on 2006 May 26 - bursts of CW tone one to ten seconds duration in groups with peaks at central frequency and +/- 64 kHz - As of 2006 Nov 16 - data transmission at 64 kHz side bands only 137.380 OPS 7613-1 1969-082B

4256 Mixed modulation (PAM/FM/AM) Navigation technology: (information contributed by Michael D Kenny) 137.400 Russian

Imaging

APT at 2 lines per second Meteorological and remote sensing imaging: Frequency not currently active 137.410 OPS 7613-6 1969-082E

4237 CW USAF test satellite: (information contributed by Michael D Kenny) 137.440 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies, individual satellites switch between them - Also transmits at 400.100 MHz 137.460 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies, individual satellites switch between them - Also transmits at 400.100 MHz 137.500 TIROS-N 1978-096A

11060 CW - carrier only Meteorological imaging: Inactive satellite but reportedly transmitting 137.500 NOAA 6 1979-057A

11416 CW - carrier only Meteorological imaging: Inactive satellite but reportedly transmitting 137.500 NOAA 9 1984-123A

15427 Tone for 6 seconds out of every 25 seconds (periods vary - these are averages) Formerly meteorological imaging: Non-operational satellite but transmitter still had power long after the payload was switched off - Timings shown are as of 2001 January 6 - Probably no longer transmitting at this frequency - Also has a transmission at 136.770 MHz 137.500 NOAA 12 1991-032A

21263 APT at 4 lines per second - interlaced visible light and infrared images Meteorological imaging: Switched off occasionally when transmissions conflict with those from NOAA 15 - Also transmits at 137.770 MHz - De-commissioned 2007 Aug 10 137.500 NOAA 15 1998-030A

25338 APT at 4 lines per second - interlaced visible light and infrared images Meteorological imaging: Switched off occasionally when transmissions conflict with those from NOAA 12 - Also transmits at 137.350 MHz 137.625 NOAA 14 1994-089A

23455 APT at 4 lines per second - interlaced visible light and infrared images Meteorological imaging: Switched off occasionally when transmissions conflict with those from NOAA 17 - Also transmits at 137.770 MHz - Decommissioned 2007 May 23 137.625 NOAA 17 2002-032A

27453 APT at 4 lines per second - interlaced visible light and infrared images Meteorological imaging: Switched off occasionally when transmissions conflict with those from NOAA 14 137.663 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz 137.688 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz 137.713 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz 137.738 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz 137.770 NOAA 11 1988-089A

19531 CW Doppler Beacon and telemetry Meteorological imaging: Continuous transmission when operational - (information contributed by Michael D Kenny) - De-commissioned 2004 June 16 137.770 NOAA 12 1991-032A

21263 CW Doppler Beacon and telemetry Meteorological imaging: Also transmitted at 137.500 MHz - De-commissioned 2007 Aug 10 137.770 NOAA 14 1994-089A

23455 CW Doppler Beacon and telemetry Meteorological imaging: Also transmits at 137.625 MHz - Decommissioned 2007 May 23 137.770 NOAA 17 2002-032A

27453 CW Doppler Beacon and telemetry Meteorological imaging: Also transmits at 137.625 MHz 137.800 Orbcomm

Digital data - transmitted to/from mobile terminals Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz 137.850 Russian

Imaging

APT at 2 lines per second Meteorological and remote sensing imaging: Frequency not currently active 137.913 NOAA 18 2005-018A

28654 APT at 4 lines per second - interlaced visible light and infrared images Meteorological imaging: Frequency probably not active - changed to 137.100 MHz (2006 Jan 4?) 143.625 ISS 1998-067A

25544 Medium bandwidth FM voice Space station: Russian segment VHF-1 channel for communication with Moscow, also used to relay Mission Control to the Shuttle during docking.



Used as part of the ISS Early Communications System over the USA working with the Wallops Facility and White Sands and still used there occasionally but mainly in test mode.



Sven Grahn detected it carrying packet data transmissions during Expedition 1. 145.800 ISS 1998-067A

25544 Amateur Radio downlink frequency Space station: Amateur radio downlink from US segment - see NASA's ARISS Page 145.825 ISS 1998-067A

25544 Amateur Radio downlink frequency Space station: Amateur radio downlink from US segment - see NASA's ARISS Page 145.919 Kedr 1998-067CK

37772 CW - morse code telemetry Amateur radio satellite released during Russian EVA from ISS 2011 Aug 3, still operating at the time of re-entry: Only transmitted at this frequency when 145.950 MHz was being used for BPSK-1000 digital telemetry transmission 145.939 Kedr 1998-067CK

37772 CW - morse code telemetry Amateur radio satellite released during Russian EVA from ISS 2011 Aug 3, still operating at the time of re-entry: Only used when the digital telemetry sytem switched to backup BPSK-400 mode 145.950 Kedr 1998-067CK

37772 Automatic switching between several transmission modes including BPSK telemetry Amateur radio satellite released during Russian EVA from ISS 2011 Aug 3, still operating at the time of re-entry: Ceased to operate on re-entry 2012 Jan 4 145.990 Suitsat 2005-035C

28933 NFM - extremely weak Amateur radio experiment - life expired Orlan spacesuit equipped with a radio transmitter and released from ISS during a crew EVA: Voice recording + SSTV image - the low power was due to a failed amplifier - Released from ISS 2006 Feb 3 and battery exhausted 2006 Feb 18 149.665 Cosmos

2463 2010-017A

36519 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Duplicate of the standard 149.940 MHz transmission at a frequency 275 kHz below it. The transmitter is faulty. 149.910 Cosmos

2341 1997-017A

24772 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.920 MHz 149.910 Cosmos

2398 2003-023A

27818 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.760 MHz 149.940 Cosmos

2378 2001-023A

26818 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.840 MHz 149.940 Cosmos

2454 2009-039A

35635 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.840 MHz 149.940 Cosmos

2463 2010-017A

36519 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.840 plus duplicated transmissions at other frequencies around 150 and 400 MHz . The transmitter is faulty. 149.970 Cosmos

2336 1996-071A

24677 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.840 MHz 149.970 Cosmos

2389 2002-026A

27436 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Transmission contains an almanac for all active satellites in the constellation - coherent transmission at 399.920 MHz 149.979 Oscar 29 1987-080B

18362 Modulated CW carrier Ionospheric modelling for US military (NIMS): Maintenance frequency - Coherent transmission at 399.944 MHz (has been heard to transmit tones similar to the other OSCAR satellite but 2003 December 28 - this frequency was occupied by a modulated 'buzzing' signal - No longer transmitting as of 2008 Feb 1 149.979 Oscar 31 1988-074B

19420 FM telemetry (tones) +/- 2.4 kHz from carrier Ionospheric modelling for US military (NIMS): Maintenance frequency - Coherent transmission at 399.944 MHz - Occasionally changes between this frequency and the operational one - Sometime between 2007 Dec 21 and 2008 Feb 7, the normal transmissions at both frequencies were replaced with a highly unstable CW carrier (wandering frequency + variations in strength) 149.988 Oscar 27 1987-080A

18361 FM telemetry (tones) +/- 2.4 kHz from carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 399.968 MHz - Occasionally changes between this frequency and the maintenance one) - No longer transmitting as of 2008 Jan 1 149.988 Oscar 23 1988-033A

19070 FM telemetry (tones) +/- 2.4 kHz from carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 399.968 MHz - Occasionally changes between this frequency and the maintenance one) 149.988 Oscar 32 1988-033B

19071 FM telemetry (tones) +/- 2.4 kHz from carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 399.968 MHz - Occasionally changes between this frequency and the maintenance one) 149.988 Oscar 25 1988-074A

19419 FM telemetry (tones) +/- 2.4 kHz from carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 399.968 MHz - Occasionally changes between this frequency and the maintenance one) 150.000 Nadezhda

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Navigation - plus Search and Rescue monitoring: Several satellites - the system is no longer operational, has been silent since 2003 November 26 - Coherent transmission at 400.000 MHz 150.000 Tsikada

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Navigation - plus Search and Rescue monitoring: Several satellites - the system is no longer operational, has been silent since 2003 November 26 - Coherent transmission at 400.000 MHz 150.012 Unknown

'Wandering' CW Unidentified satellite: Satellite in GEO, possibly graveyard orbit, also transmits 400.032 MHz 150.012 Geosat 1985-021A

15595 CW - Doppler tracking beacon Oceanography - wave height measurement: Detected being switched on and off over Europe, not continuously active. Sometime around 2007, transmissions ceased to be detected but Geosat was subsequently determined to be transmitting continuously while in sunlight. Coherent transmission at 400.032 MHz 150.012 RADCAL 1993-041A

22698 CW - Doppler tracking beacon Radar calibration: Radar Calibration satellite - Coherent transmission at 400.032 MHz, operation is intermittent 150.012 GFO 1998-007A

25157 CW - Doppler tracking beacon Oceanography - wave height measurement: Geosat Follow On satellite - Coherent transmission at 400.032 MHz and also transmitted at 2207.5 MHz. Ceased to transmit 2008 November. 150.012 ARGOS 1999-008A

25634 CW - Doppler tracking beacon USAF space experiments: Coherent transmission at 400.032 MHz - Ceased to transmit 2003 150.012 USA 147 1999-067A

25991 CW - Doppler tracking beacon Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2207.535 MHz, 2237.5 MHz and 2252.5 MHz, and 400.032 MHz - Post-launch testing revealed interference with other equipment from the 150/400 MHz transmitters so they remained inactive (apart from further testing) until 2006 Aug 14 150.012 Picosat 9 2001-043B

26930 CW - Doppler tracking beacon USAF Space Test Program (STEP): Coherent transmission at 400.032 MHz - Ceased to transmit late-2004 150.012 Formosat

3A 2006-011A

29047 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 400.032 MHz and 1066.752 MHz 150.012 Formosat

3B 2006-011B

29048 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 400.032 MHz and 1066.752 MHz 150.012 Formosat

3C 2006-011C

29049 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 400.032MHz and 1066.752 MHz 150.012 Formosat

3D 2006-011D

29050 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 400.032 MHz and 1066.752 MHz 150.012 Formosat

3E 2006-011E

29051 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 400.032 MHz and 1066.752 MHz 150.012 Formosat

3F 2006

29052 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 400.032 MHz and 1066.752 MHz 150.030 Cosmos

2361 1998-076A

25590 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Coherent transmission at 400.080 MHz 150.215 Cosmos

2463 2010-017A

36519 FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz Positional signal transmissions and store/forward comms: Duplicate of the standard 149.940 MHz transmission at a frequency 275 kHz above it. The transmitter is faulty. 150.300 Cosmos

2373 2000-058A

26552 AM telemetry - wide bandwidth Photographic mapping: Coherent transmission at 400.800 MHz - Cameras and film recovered after mission running between 2000 September 29 and 2000 November 14 - no longer in orbit 150.300 Cosmos

2415 2005-034A

28841 CW - Doppler tracking beacon Photographic reconnaissance: Coherent transmission at 400.800 MHz - Cameras and film recovered after mission mission running between 2005 September 2 and 2005 October 14 - transmissions heard over the USA - no longer in orbit 166.000 Soyuz

TMA-M

Telemetry transmission PCM-FM, sidebands ±128 kHz ISS Crew ferry: Digital control system, three crew seats, from 2011 166.000 Progress

M-M

Telemetry transmission PCM-FM, sidebands ±128 kHz ISS supplies ferry: 2008- 179.951 Ziyuan

2-01 2000-050A

26481 CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz- and further carriers at +/- 40 kHz Remote Sensing: Coherent transmission at 479.865 MHz. No longer transmitting. 180.006 Fengyun 1C 1999-025A

25730 CW carrier on centre frequency plus telemetry sidebands at +/- 5 kHz- and further carriers at +/- 10 kHz Meteorological imaging: Active transmitter until 2007 February when attacked in ground-based interceptor test - Coherent transmission at 480.017 MHz 180.007 Fengyun 1D 2002-024B

27431 CW carrier on centre frequency plus telemetry sidebands at +/- 5 kHz- and further carriers at +/- 10 kHz Meteorological imaging: Coherent transmission at 480.017 MHz, also transmits 2201.050 MHz 180.011 CBERS 1 1999-057A

25940 CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz - and further carriers at +/- 40 kHz Remote sensing: China Brasil Earth Resources Satellite - Coherent transmission at 480.025 MHz - Silent since mid 2003, the last public report being 2003 Jun 6 by Maik Hermenau of www.satellitenwelt.de 180.013 CBERS 2B 2007-042A

32062 CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz- and further carriers at +/- 40 kHz Remote sensing: China Brazil Earth Resources Satellite - Coherent transmission at 480.033 MHz, also transmits 2204.400 MHz and 2267.500 MHz. No longer transmitting - switched off 2010 May 10 after an operating anomaly was detected 2010 March. 180.014 CBERS 2 2003-049A

28057 CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz- and further carriers at +/- 40 kHz Remote sensing: China Brazil Earth Resources Satellite - Coherent transmission at 480.037 MHz, also transmits 2204.400 MHz and 2267.500 MHz, ceased to transmit 2007 243.000 Shenzhou

Signal content not known Piloted spacecraft: Recovery beacon transmitted during descent under parachute - NOTE: this is an international distress frequency 243.695 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 1, no longer transmitting. 243.695 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 1, no longer transmitting. 243.705 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 2, no longer transmitting. 243.705 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 2, no longer transmitting. 243.710 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 3, no longer transmitting. 243.710 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 3, no longer transmitting. 243.715 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 4, no longer transmitting. 243.715 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 4, no longer transmitting. 243.720 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 5, no longer transmitting. 243.720 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 5, no longer transmitting. 243.725 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 6, no longer transmitting. 243.725 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 6, no longer transmitting. 243.730 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 7, no longer transmitting. 243.730 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 7, no longer transmitting. 243.735 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 8, no longer transmitting. 243.735 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 8, no longer transmitting. 243.740 USA 125 1996-038A

23945 Channel usually occupied by an unmodulated carrier US comms and intelligence gathering: AFSATCOM Channel 9, no longer transmitting. 243.740 USA 137 1998-005A

25148 Channel usually occupied by an unmodulated carrier US comms and intelligence gathering: AFSATCOM Channel 9, no longer transmitting. 243.745 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 10, no longer transmitting. 243.745 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 10, no longer transmitting. 243.750 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 11, no longer transmitting. 243.750 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 11, no longer transmitting. 243.760 USA 125 1996-038A

23945 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 12, no longer transmitting. 243.760 USA 137 1998-005A

25148 CW - RTTY-style data US comms and intelligence gathering: AFSATCOM Channel 12, no longer transmitting. 243.825 USA 99 1994-009A

22988 Spread spectrum signal - +/- 64 kHz from centre frequency Comms: Tentative identification (may be more than one satellite) in geosynchronous orbit, can be heard with relatively simple receiver/antenna setup - in CW mode, it sounds like trickling water! 244.512 Cosmos

2385 2001-058B

27056 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Gonets

D1-8 2001-058E

27059 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz.



This is a Stela-3 even though listed elsewhere as Gonets-D1. There was a NORAD name mix-up with Cosmos 2386. 244.512 Cosmos

2390 2002-036A

27464 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2391 2002-036B

27465 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2400 2003-037A

27868 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2408 2004-037A

28419 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2409 2004-037B

28420 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2437 2008-025B

32954 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2438 2008-025C

32955 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2439 2008-025D

32956 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2451 2009-036A

35498 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2453 2009-036C

35500 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.512 Cosmos

2467 2010-043B

37153 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 261.035 MHz. 244.999 Gonets M-2 2010-043A

37152 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 388.688 MHz. 244.999 Cosmos

2468 2010-043C

37154 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 388.688 MHz. 245.157 Gonets

D1-1 1996-009A

23787 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Gonets

D1-2 1996-009B

23788 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Gonets

D1-4 1997-006D

24728 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Gonets

D1-5 1997-006E

24729 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Gonets

D1-6 1997

24730 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Cosmos

2386 2001-058C

27057 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Gonets

D1-7 2001-058D

27058 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 245.157 Gonets

D1-9 2001

27060 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at another frequency in the 240-260 MHz band 250.075 USA 162 2001-046A

26948 AM - 4.8 kHz data tone US intelligence-related satellite near 144° west longitude, possibly including communications: One of a triplet of reported frequencies carrying similar signals from satellite in geosynchronous orbit, exact frequency not known - also reported to transmit at 256.475, 263.225, 267.550 MHz and 2242.5 MHz 250.150 USA 76 1991-076D

21808 CW carrier detectable at 250.158 MHz then a series weaker carriers up and down from this frequency at 9.6 kHz intervals between approximate limits of 250.0 and 250.25 MHz US Military ocean surveillance: Navy Ocean Surveillance System, transmission is probably from a secondary payload - Transmission intermittent - First reported 2005 September then went into a period of silence - (the listed satellite is one of a cluster) 250.158 USA 121 1996-029D

23862 AM - 4.8 kHz data tone US Military ocean surveillance: Navy Ocean Surveillance System, transmission is probably from a secondary payload and is on for extended periods - no reports of any switch on/off activity - (the listed satellite is one of a cluster) 251.275 USA 198 2007-060A

32378 AM - 4.8 kHz data tone plus various test modes Intelligence-related satellite, possibly including communications: One of a pair of transmissions from a secondary payload on US classified satellite in HEO used during the test phase of the satellite up until 2008 March 13 - on March 14, USA-198 switched to its operational frequencies at 251.700 MHz and 256.375 MHz, test transmission also at 258.800 MHz, plus transmitter at 2242.50 MHz 251.325 USA 155 2000-080A

26635 AM - 4.8 kHz data tone US intelligence-related satellite near 10° west longitude: One of a triplet of similar of transmissions from a secondary payload on a US classified satellite in GEO, signal appears to be continuous and is similar to ones from USA-179 - Also transmits at 252.675 MHz, 258.775 MHz, 268.6755 MHz and 2242.486 MHz. No longer operational. 251.700 USA 179 2004-034A

28384 AM - 4.8 kHz data tone US intelligence-related satellite: One of a pair of transmissions from a secondary payload on US classified satellite in HEO - Switched on and off to co-ordinate coverage with USA-198 - Prior to 2008 Mar 14, USA-179 was operating alone and was providing near 8 hours' coverage per pass at this frequency - Also transmits at 256.375 MHz and 2242.50 MHz 251.700 USA 198 2007-060A

32378 AM - 4.8 kHz data tone Intelligence-related satellite, possibly including communications: One of a pair of transmissions from a secondary payload on US classified satellite in HEO - Switched on and off to co-ordinate coverage with USA-179 - Also transmits at 256.375 MHz and 2242.50 MHz 252.675 USA 155 2000-080A

26635 AM - high speed (19.2 kb/s?) data transmission US intelligence-related satellite near 10° west longitude: Transmissions from a secondary payload on a US classified satellite in GEO, signal appears to be continuous - Also transmits at 251.325 MHz, 258.775 MHz, 268.675 MHz and 2242.486 MHz. No longer operational. 256.375 USA 179 2004-034A

28384 AM - 4.8 kHz data tone US intelligence-related satellite: One of a pair of transmissions from a secondary payload on US classified satellite in HEO - Switched on and off to co-ordinate coverage with USA-198 - Prior to 2008 Mar 14, USA-179 was operating alone and was providing near 8 hours' coverage per pass at this frequency - Also transmits at 251.700 MHz and 2242.50 MHz 256.375 USA 198 2007-060A

32378 AM - 4.8 kHz data tone Intelligence-related satellite, possibly including communications: One of a pair of transmissions from a secondary payload on US classified satellite in HEO - Switched on and off to co-ordinate coverage with USA-179 - Also transmits at 251.700 MHz and 2242.50 MHz 256.475 USA 162 2001-046A

26948 AM - 4.8 kHz data tone US intelligence-related satellite near 144° west longitude, possibly including communications: One of a triplet of reported frequencies carrying similar signals from satellite in geosynchronous orbit, exact frequency not known - also reported to transmit at 250.075, 263.225, 267.550 MHz and 2242.5 MHz 258.150 USA 81 1992-023A

21949 AM - data plus modulated tones at 4.8 and 9.6 kHz Electronic intelligence gathering: European observations indicates that it is switched on and off on command from ground stations in Italy and Spain - also transmits at 2202.5 MHz and 2257.53 MHz, no longer active 258.775 USA 155 2000-080A

26635 AM - 4.8 kHz data tone US intelligence-related satellite near 10° west longitude: One of a triplet of similar of transmissions from a secondary payload on a US classified satellite in GEO, signal appears to be continuous and is similar to ones from USA-179 - Also transmits at 251.325 MHz, 252.675 MHz, 268.675 MHz and 2242.486 MHz. No longer operational. 258.800 USA 198 2007-060A

32378 AM - 4.8 kHz data tone plus various test modes Intelligence-related satellite, possibly including communications: One of a pair of transmissions from a secondary payload on US classified satellite in HEO used during the test phase of the satellite up until 2008 March 13 - on March 14, USA-198 switched to its operational frequencies at 251.700 MHz and 256.375 MHz, sharing duties with USA-179 - Test transmission also at 251.275 MHz, plus transmitter also at 2242.50 MHz 259.700 STS

AM voice ISS Crew/payload transport: Detected over Europe occasionally prior to Shuttle re-entry from ISS operations, and with voice during the orbital injection phase from Kennedy SC to Europe - also transmitted at 2217.500 MHz, 1981-2011 261.035 Cosmos

2385 2001-058B

27056 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Gonets

D1-8 2001-058E

27059 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz.



This is a Strela-3 even though listed elsewhere as Gonets-D1. There was a NORAD name mix-up with Cosmos 2386. 261.035 Cosmos

2390 2002-036A

27464 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2391 2002-036B

27465 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2400 2003-037A

27868 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2408 2004-037A

28419 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2409 2004-037B

28420 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2437 2008-025B

32954 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2438 2008-025C

32955 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2439 2008-025D

32956 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2451 2009-036A

35498 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2453 2009-036C

35500 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 261.035 Cosmos

2467 2010-043B

37153 Data transmission as messages are forwarded Store and Forward communications: Message Signal at 244.512 MHz. 262.910 Gonets

D1-6 1997

24730 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 8.



Message Signal at 261.035 MHz. 262.910 Cosmos

2386 2001-058C

27057 Data transmission as messages are forwarded Store and Forward communications: This is a Gonets-D1 even though listed elsewhere as Strela-3. There was a NORAD name mix-up with Gonets D1-8. Has been reported on other frequencies in the past - entry updated 2009 Mar 8.

262.910 Gonets

D1-7 2001-058D

27058 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 8. 262.910 Gonets

D1-9 2001

27060 Data transmission as messages are forwarded Store and Forward communications: Frequency is changed occasionally - entry updated 2009 Mar 8.



Message Signal at 261.035 MHz. 263.086 Gonets

D1-1 1996-009A

23787 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 8.



Message Signal at 261.035 MHz. 263.225 USA 162 2001-046A

26948 AM - high speed (19.2 kb/s?) data transmission US intelligence-related satellite near 144° west longitude, possibly including communications: Reported frequency for a satellite in geosynchronous orbit, exact frequency not known - also reported to transmit at 250.075 MHz,256.475, 267.550 MHz and 2242.5 MHz 264.400 Gonets

D1-5 1997-006E

24729 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 8.



Message Signal at 261.035 MHz. 264.750 Gonets

D1-4 1997-006D

24728 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 8.



Message Signal at 261.035 MHz. 265.059 Gonets

D1-2 1996-009B

23788 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 8.



Message Signal at 261.035 MHz. 265.137 Gonets

D1-3 1996-009C

23789 Data transmission as messages are forwarded Store and Forward communications: Has been reported on other frequencies in the past - entry updated 2009 Mar 13.



May now be silent, no Message Signal detected 2009 Sept. 267.550 USA 162 2001-046A

26948 AM - 4.8 kHz data tone US intelligence-related satellite near 144° west longitude, possibly including communications: One of a triplet of reported frequencies carrying similar signals from satellite in geosynchronous orbit, exact frequency not known - also reported to transmit at 250.075 MHz, 256.475 MHz, 263.225MHz and 2242.5 MHz 268.675 USA 155 2000-080A

26635 AM - 4.8 kHz data tone US intelligence-related satellite near 10° west longitude: One of a triplet of similar of transmissions from a secondary payload on a US classified satellite in GEO, signal appears to be continuous and is similar to ones from USA-179 - Also transmits at 251.325 MHz, 252.675 MHz, 258.775 MHz and 2242.486 MHz. No longer operational. 388.688 Cosmos

2452 2009-036B

35499 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 244.999 MHz. 388.688 Gonets M-2 2010-043A

37152 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 244.999 MHz. 388.688 Cosmos

2468 2010-043C

37154 Message Signal every 60s, silent when receiving data message from ground Store and Forward communications: Stored messages are transmitted at 244.999 MHz. 388.688 Gonets M-3

2012-041B

38734 Message Signal every 60s or 120s depending on the operating mode, silent when receiving data message from ground. Store and Forward communications: Stored messages are transmitted at 244.999 MHz. 388.688 Gonets M-4 2012-041D

38736 Message Signal every 60s or 120s depending on the operating mode, silent when receiving data message from ground. Store and Forward communications: Stored messages are transmitted at 244.999 MHz. 399.150 Cosmos

2463 2010-017A

36519 CW carrier Positional signal transmissions and store/forward comms: Duplicate of the standard 399.840 MHz transmission at a frequency 690 kHz below it. The transmitter is faulty. 399.703 Cosmos

2463 2010-017A

36519 CW carrier Positional signal transmissions and store/forward comms: Duplicate of the standard 399.840 MHz transmission at a frequency 137 kHz below it. The transmitter is faulty. 399.760 Cosmos

2341 1997-017A

24772 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.910 MHz 399.760 Cosmos

2398 2003-023A

27818 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.910 MHz 399.840 Cosmos

2378 2001-023A

26818 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.940 MHz 399.840 Cosmos

2389 2002-026A

27436 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.940 MHz 399.840 Cosmos

2454 2009-039A

35635 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.940 MHz 399.840 Cosmos

2463 2010-017A

36519 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.940 MHz plus plus duplicated transmissions at other frequencies around 150 and 400 MHz due. The transmitter is faulty. 399.920 Cosmos

2336 1996-071A

24677 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Coherent transmission at 149.970 MHz 399.944 Oscar 29 1987-080B

18362 Modulated CW carrier Ionospheric modelling for US military (NIMS): Maintenance frequency - Coherent transmission at 149.979 MHz (known to change between this frequency and the operational one) - No longer transmitting as of 2008 Jan 1 399.944 Oscar 31 1988-074B

19420 Modulated CW carrier Ionospheric modelling for US military (NIMS): Maintenance frequency - Coherent transmission at 149.979 MHz (known to change between this frequency and the operational one) - Sometime between 2007 Dec 21 and 2008 Feb 7, the normal transmissions at both frequencies were replaced with a highly unstable CW carrier (wandering frequency + variations in strength) 399.968 Oscar 27 1987-080A

18361 Modulated CW carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one) - No longer transmitting as of 2008 Feb 1 399.968 Oscar 23 1988-033A

19070 Modulated CW carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one) 399.968 Oscar 32 1988-033B

19071 Modulated CW carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one) 399.968 Oscar 25 1988-074A

19419 Modulated CW carrier Ionospheric modelling for US military (NIMS): Operational frequency - Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one) 399.977 Cosmos

2463 2010-017A

36519 CW carrier Positional signal transmissions and store/forward comms: Duplicate of the standard 399.840 MHz transmission at a frequency 137 kHz above it. The transmitter is faulty. 400.000 Nadezhda

CW - Doppler tracking beacon Navigation - plus Search and Rescue monitoring: Coherent transmission at 150.000 MHz - no longer active (see 150 MHz note) 400.000 Tsikada

CW - Doppler tracking beacon Navigation - plus Search and Rescue monitoring: Coherent transmission at 150.000 MHz - no longer active (see 150 MHz note) 400.032 Unknown

'Wandering' CW Unidentified satellite: Satellite in GEO, possibly graveyard orbit, also transmits 150.012 MHz 400.032 Geosat 1985-021A

15595 CW - Doppler tracking beacon Oceanography - wave height measurement: Detected being switched on and off over Europe, not continuously active. Sometime around 2007, transmissions ceased to be detected but Geosat was subsequently determined to be transmitting continuously while in sunlight. Coherent transmission at 150.012 MHz 400.032 RADCAL 1993-041A

22698 CW - Doppler tracking beacon Radar calibration: Radar Calibration satellite - Coherent transmission at 150.012 MHz, operation is intermittent 400.032 GFO 1998-007A

25157 CW - Doppler tracking beacon Oceanography - wave height measurement: Geosat Follow On - Coherent transmission at 150.012 MHz and also transmittedat 2207.5 MHz. Ceased to transmit 2008 November. 400.032 ARGOS 1999-008A

25634 CW - Doppler tracking beacon USAF space experiments: Coherent transmission at 150.012 MHz - Ceased to transmit 2003 400.032 USA 147 1999-067A

25991 CW - Doppler tracking beacon Military meteorological satellite: Defense Meteorological Satellite Program - also transmits at 2207.535 MHz, 2237.5 MHz, and 150.012 MHz - Post-launch testing revealed interference with other equipment from the 150/400 MHz transmitters so they remained inactive (apart from further testing) until 2006 Aug 14 . 400.032 Picosat 9 2001-043B

26930 CW - Doppler tracking beacon USAF Space Test Program (STEP): Detected being switched on and off over Europe, not continuously active - Coherent transmission at 150.012 MHz - Ceased to transmit late-2004 400.032 Formosat

3A 2006-011A

29047 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 1066.752 MHz 400.032 Formosat

3B 2006-011B

29048 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 1066.752 MHz 400.032 Formosat

3C 2006-011C

29049 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 1066.752 MHz, during 2007 December, Formosat 3C appeared to be about 5 kHz lower than the nominal frequency - the other frequencies may be shifted pro-rata

400.032 Formosat

3D 2006-011D

29050 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 1066.752 MHz 400.032 Formosat

3E 2006-011E

29051 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 1066.752 MHz 400.032 Formosat

3F 2006

29052 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 1066.752 MHz 400.080 Cosmos

2361 1998-076A

25590 CW - Doppler tracking beacon Positional signal transmissions and store/forward comms: Non operational but still transmitting 2000 December 13 - Coherent transmission at 150.030 MHz 400.100 Orbcomm

CW - Doppler tracking beacon Mobile telephony: Several satellites - Also transmitting digitised telephony signals at various frequencies 137-138 MHz (see individual entries) 400.117 Cosmos

2463 2010-017A

36519 CW carrier Positional signal transmissions and store/forward comms: Duplicate of the standard 399.840 MHz transmission noted late-September 2010. The transmitter is faulty. 400.180 USA 217 2010-062A

37222 Trigger pulse for ground ground-based transmitters at 16s intervals Military space technology experiments incl Store-Dump comms: Transmission from Ocean Data Telemetry Microsat Link payload to collect data from sensors on such as ocean data buoys or small, unattended ground stations. Transmits only when in range of an active sensor. 400.450 Akebono 1989-016A

19822 CW modulated Studies of Magnetosphere and Ionosphere - Japan: Carrier with data modulation - appears as a tone modulated by a buzz 400.530 Cosmos

2463 2010-017A

36519 CW carrier Positional signal transmissions and store/forward comms: Duplicate of the standard 399.840 MHz transmission at a frequency 690 kHz above it. The transmitter is faulty. 400.550 Resurs-O1 1998-043A

25394 CW Spread Spectrum Remote sensing: Signals from Little LEO ranging between 400.318 and 400.787 MHz - Piggy-back 'store and forward' communications payload carried by Russian satellite - Transmitter not heard since 2001 February - The meteorological payload transmitted at 137.85 MHz - no longer active 400.552 Munin 2000-075C

26621 AM - modem-type databursts Auroral research - Sweden: Telemetry but silent since 2001 Feb 12 (shortly after launch) probably due to onboard computer failure - no longer active 400.595 AprizeSat

2 2004-025A

28366 Data bursts, approx 35s intervals Data comms: - 400.800 Cosmos

2373 2000-058A

26552 CW - Doppler tracking beacon Photographic mapping: Coherent transmission at 150.300 MHz - Cameras and film recovered after mission running between 2000 September 29 and 2000 November 14 - no longer active 400.800 Cosmos

2415 2005-034A

28841 CW - Doppler tracking beacon Photographic reconnaissance: Coherent transmission at 150.300 MHz - Cameras and film recovered after mission running between 2005 September 2 and 2005 October 14? - no longer active 435.360 MiR 2012-041C

38735 Multiple side bands, varying data content Technology: Noted while checking payloads of 2012-043 Launch 465.000 Omid 2009-004A

33506 AM - multiple sidebands with 25 kHz bandwidth Testing comms up/down links: Switched on and off by onboard timer programmed from the ground 465.000 Rasad 1 2011-025A

37675 Testing gravity gradient stabilisation and, possibly, Earth imaging: Uplink at 401 MHz 465.000 Navid 2012-005A

38075 Imaging satellite: Images reported successfully returned, may only be transmitting over Iraq, uplink at 401 MHz 470.000

Mixed - music and telemetry : Failed to reach orbit, the music consisted of songs in praise of Korean leaders Kim Jong Il and Kim Il Sung. The previous KMS satellite (2009) also failed to reach orbit and was reported to use the same frequency. 479.865 Ziyuan

2-01 2000-050A

26481 CW - Doppler tracking beacon Remote Sensing: Coherent transmission at at 179.951 MHz. No longer transmitting. 480.017 Fengyun 1D 2002-024B

27431 CW - Doppler tracking beacon Meteorological imaging: Coherent transmission at 180.007 MHz, also transmits 2201.050 MHz 480.019 Fengyun 1C 1999-025A

25730 CW - Doppler tracking beacon Meteorological imaging: Active transmitter until 2007 February when attacked in ground-based interceptor test - Coherent transmission at 180.007 MHz 480.025 CBERS 1 1999-057A

25940 CW - Doppler tracking beacon Remote sensing: China Brasil Earth Resources Satellite - Coherent transmission at 180.011 MHz - silent since mid-2003 480.033 CBERS 2B 2007-042A

32062 CW - Doppler tracking beacon Remote sensing: China Brazil Earth Resources Satellite - Coherent transmission at 180.013 MHz, also transmits at 2204.400 MHz and 2267.500 MHz. No longer transmitting - switched off 2010 May 10 after an operating anomaly was detected 2010 March 480.037 CBERS 2 2003-049A

28057 CW - Doppler tracking beacon Remote sensing: China Brazil Earth Resources Satellite - Coherent transmission at 180.014 MHz, also transmits 2204.400 MHz and 2267.500 MHz, ceased to transmit 2007 628.000 ISS 1998-067A

25544 FM telemetry - sidebands at +/- 128 kHz Space station: Transmission from the Zvezda module.



Transmits on command from within Russia, several times per day - usually in parallel with 630 MHz - Similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system. 630.000 ISS 1998-067A

25544 FM telemetry - sidebands at +/- 128 kHz Space station: Transmission from the Zvezda module.



Transmits on command from within Russia, several times per day - usually in parallel with 628 MHz - Similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system. 632.000 ISS 1998-067A

25544 FM telemetry - sidebands at +/- 128 kHz Space station: Transmission from the Zarya module.



Transmissions originally reported by Sven Grahn when Zarya first reached orbit - Similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system and probably no longer in use 633.909 ISS 1998-067A

25544 FM telemetry - sidebands at +/- 128 kHz Space station: Transmission from the Zarya module. The central frequency is 91 kHz lower than what might be regarded as the norm for this type of transmission.



Transmissions originally reported by Sven Grahn when Zarya first reached orbit - similar transmission format to Soyuz/Progress at 166 MHz but with lower power - part of the BITS telemetry system. Transmissions are infrequent. 922.763 Soyuz

TMA-M

CW carrier. ISS Crew ferry: Part of the REGUL command and control system - there may be other elements of signals on sidebands around this frequency. Digital control system, three crew seats, from 2011 922.763 Progress

M-M

CW carrier. ISS supplies ferry: Part of the REGUL command and control system - there may be other elements of signals on sidebands around this frequency. 2008- 1018.500 Briz-M

CW carrier plus sidebands Space launcher: Final launch vehicle stage, also transmits 1020.5 MHz - first tracked by Sven Grahn 1020.500 Briz-M

CW carrier plus sidebands Space launcher: Final launch vehicle stage, also transmits 1018.5 MHz - first tracked by Sven Grahn 1066.752 Formosat

3A 2006-011A

29047 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 400.032 MHz 1066.752 Formosat

3B 2006-011B

29048 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 400.032 MHz 1066.752 Formosat

3C 2006-011C

29049 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 400.032 MHz 1066.752 Formosat

3D 2006-011D

29050 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 400.032 MHz 1066.752 Formosat

3E 2006-011E

29051 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 400.032 MHz 1066.752 Formosat

3F 2006

29052 CW Atmospheric studies: Switched on when observation required, European observations usually 08:00-17:00 UTC Mon-Fri, also transmits 150.012 MHz and 400.032 MHz 2200.647 Meteor M-1 2009-049A

35865 CW Meteorology: Appears to be continuous transmission - first noted 2010 September 2201.050 Fengyun 1D 2002-024B

27431 CW Meteorological imaging: Appears to be continuous transmission - first noted 2010 September, also transmits 180.007 and 480.017 MHz 2202.447 SGLS 1 Sicral 1A 2001-005A

26694 CW carrier plus sub-carriers at 293kHz and 297 kHz Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2202.507 SGLS 1 USA 32 1988-078A

19460 CW carrier plus side-bands Electronic intelligence gathering: Also transmits at 2282.5 MHz but transmissions at the two frequencies are not simultaneous 2202.513 SGLS 1 USA 81 1992-023A

21949 CW carrier plus side-bands Electronic intelligence gathering: Also transmits at 2257.530 MHz, thought to be no longer active but detected early 2011 2203.700 USA 205 2009-023A

34903 CW carrier + sidebands Development of missile sensors: Frequency not measured precisely 2204.400 CBERS 2 2003-049A

28057 CW carrier + sidebands Remote sensing: China Brazil Earth Resources Satellite, also transmits 180.014 MHz, 480.037 MHz and 2267.500 MHz, ceased to transmit 2007 2204.400 CBERS 2B 2007-042A

32062 CW carrier plus data sidebands Remote sensing: China Brazil Earth Resources Satellite, also transmits 180.013 MHz, 480.033 MHz and 2267.500 MHz. No longer transmitting - switched off 2010 May 10 after an operating anomaly was detected 2010 March 2205.328 Telecom 2D 1996-044B

24209 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2205.500 Shijian 7 2005-024A

28737 CW carrier + sidebands Science/technology experiments: Frequency reported 2008, also transmits 2227.500 MHz 2207.130 Telecom 2C 1995-067A

23730 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2207.487 SGLS 2 GFO 1998-007A

25157 CW carrier plus side-bands Oceanography - wave height measurement: Geosat Follow On - Also transmitted at 150.012 MHz and 400.032 MHz. Ceased to transmit 2008 November. 2207.500 SGLS 2 AMS 2 1977-044A

10033 CW carrier plus side-bands Military meteorological satellite: Advanced Meteorological Satellite - Also transmits at 2237.5MHz and 2252.5 MHz - Frequency Information contributed by the late Ivan Artner 2207.500 Ziyuan

2-03 2004-044A

28470 CW carrier + sidebands Military reconnaissance: Frequency reported 2008, also transmits at 2220.5 MHz 2207.510 SGLS 2 USA 172 2003-048A

28054 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2222.5 MHz, 2237.5 MHz and 2247.5 MHz 2207.535 SGLS 2 USA 147 1999-067A

25991 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2252.5 MHz, 150.012 MHz and 400.032 MHz (the last two are the RADCAL frequencies) 2209.797 Huan Jing

1B 2008-041B

33321 CW plus data sidebands Disaster monitoring within China: Strong, Part of constellation 2212.504 SGLS 3 Coriolis 2003-001A

27640 CW carrier plus side-bands Military science satellite: Also transmits at 2222.528 MHz 2212.809 Yaogan 3 2007-055A

32289 CW carrier (+sidebands?) Remote sensing, possible military connection - reportedly equipped with a synthetic aperture radar: May not transmit on all passes - European observations are more common on southbound passes (these occur between passes over the PRC mainland), also transmits 2295.650 MHz 2212.810 Yaogan 1 2006-015A

29092 CW carrier (+sidebands?) Remote sensing with synthetic aperture radar, government and military: European observations tend to be on southbound passes (these occur between passes over the PRC mainland), also transmits 2295.650 MHz. No longer active - Yaogan 1 broke into several pieces 2010 Feb 4. 2213.600 Shijian

6C 2006-046A

29505 CW carrier + sidebands Science/technology experiments: Frequency reported 2008 2216.525 Yaogan 4 2008-061A

33446 CW carrier (+sidebands?) Optical remote sensing - military or government: - 2216.527 Yaogan 2 2007-019A

31490 CW carrier (+sidebands?) Optical remote sensing - military or government: - 2216.527 Yaogan 7 2009-069A

36110 CW Carrier + sidebands Optical remote sensing - military or government: - 2217.367 Shiyan 2 2004-046A

28479 CW carrier + sidebands Science/technology experiments: Strong, possibly pulsating rapidly 2217.500 SGLS 4 STS

CW carrier plus side bands carrying data ISS Crew/payload transport: Integrated voice and data on SGLS Channel 4 - transmitter operates almost continuously while the payload bay doors are open, also transmitted at 259.7 MHz, 1981-2011 2217.500 SGLS 4 Cloudsat 2006-016A

29107 CW carrier + sidebands NASA - cloud & precipitation studies: Frequency is approximate 2220.476 Yaogan 5 2008-064A

33456 CW carrier (+sidebands?) Remote sensing, possible military connection - reportedly equipped with a synthetic aperture radar: Also reportedly transmits 2282.1 MHz 2220.500 Ziyuan

2-03 2004-044A

28470 CW carrier + sidebands Military reconnaissance: Frequency reported 2008, also transmits at 2207.5 MHz 2222.476 SGLS 5 USA 152 2000-047A

26473 CW carrier plus side-bands Military radar reconnaissance satellite: - 2222.481 SGLS 5 USA 172 2003-048A

28054 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2207.5, MHz, 2237.5 MHz and 2247.5 MHz 2222.487 SGLS 5 USA 210 2009-057A

35951 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program 2222.497 SGLS 5 USA 191 2006-050A

29522 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2237.515 MHz and (according to observations by the late Ivan Artner) at 2249.415 MHz 2222.500 SGLS 5 USA 173

p/l 1 2003-054A

28095 CW carrier plus side-bands Ocean SIGINT: Navy Ocean Surveillance System - Also transmits at 2232.5 MHz. Frequency Information contributed by the late Ivan Artner 2222.500 SGLS 5 USA 181

p/l 1 2005-004A

28537 CW carrier plus side-bands Navy Ocean Surveillance System SIGINT: Navy Ocean Surveillance System - also transmits at 2232.5 MHz and 2277.5 MHz - latter frequency Information contributed by the late Ivan Artner 2222.502 SGLS 5 USA 133 1997-064A

25017 CW carrier plus side-bands Radar imaging reconnaissance: Frequency Information contributed by the late Ivan Artner 2222.508 SGLS 5 USA 69 1991-017A

21147 CW carrier plus side-bands Radar imaging reconnaissance: Frequency Information originally contributed by the late Ivan Artner - later confirmed by other observers 2222.528 SGLS 5 Coriolis 2003-001A

27640 CW carrier plus side-bands Military science satellite: Frequency Information contributed by the late Ivan Artner, also transmits at 2212.504 MHz 2224.065 Shenzhou

CW carrier plus side-bands Piloted spacecraft: Frequency first detected during the Shenzhou 7 mission (2008 September) by Richard Flagg, Hawaii USA - transmission is probably continuous while in orbit 2224.564 Shijian

6-03A 2008-053A

33408 CW carrier + sidebands Science/technology experiments: - 2227.476 SGLS 6 NATO 4B 1993-076A

22921 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2227.481 SGLS 6 NATO 4A 1991-001A

21047 PSK with sub-carrier, 1024 kHz Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2227.487 SGLS 6 Skynet 4C 1990-079A

20776 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2227.497 SGLS 6 Skynet 4E 1999-009B

25639 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2227.500 Shijian 7 2005-024A

28737 CW carrier + sidebands Science/technology experiments: Frequency reported 2008, also transmits 2205.500 MHz 2227.508 SGLS 6 Skynet 4D 1998-002A

25134 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2227.514 SGLS 6 Skynet 4F 2001-005B

26695 CW carrier plus side-bands Comms: Geosynchronous orbit - 2229.605 Shijian

6A 2004-035A

28413 CW carrier + sidebands Science/technology experiments: - 2230.795 Shiyan 3 2008-056A

33433 CW carrier + sidebands Science/technology experiments: Weak 2232.215 Tiangong 1 2011-053A

37820 - Experimental space laboratory: Frequency reported by Richard Flagg, Hawaii. Continuous transmission. Also transmits 2250.720 MHz. 2232.495 SGLS 7 USA 118 1996-026A

23855 CW carrier plus side-bands Multi-tasking military satellite at 13° west longitude?: Geosynchonous orbit - Frequency Information contributed by the late Ivan Artner 2232.495 SGLS 7 USA 160

p/l 1 2001-040A

26905 CW carrier plus side-bands Ocean SIGINT: Also reported to transmit 2277.5 MHz 2232.496 SGLS 7 USA 105 1994-054A

23223 CW carrier plus side-bands Multi-tasking military satellite at 27°.5 west longitude: Geosynchonous orbit - Frequency Information contributed by the late Ivan Artner 2232.497 SGLS 7 USA 159 2001-033A

26880 FM wide-bandwidth data Geosynchronous missile early warning at 70° east longitude: Defense Support Program also transmits at 2237.5 MHz - Frequency Information contributed by the late Ivan Artner 2232.498 SGLS 7 USA 149 2000-024A

26356 FM wide-bandwidth data Geosynchronous missile early warning at 8°.5 east longitude: Defense Support Program also transmits at 2237.5 MHz - Frequency Information contributed by the late Ivan Artner 2232.498 SGLS 7 USA 173

p/l 1 2003-054A

28095 CW carrier plus side-bands Ocean SIGINT: Transmission may be from 28097 (NOSS 3-2 follower). Also reported to transmit at 2222.5 MHz 2232.498 SGLS 7 USA 194

p/l 1 2007-027A

31701 CW carrier + side bands Navy Ocean Surveillance System - ocean SIGINT: Transmission may be from the NOSS 3-4 follower 2232.498 SGLS 16 USA 198 2007-060A

32378 CW carrier plus side-bands Intelligence-related satellite, possibly including communications: Navy Ocean Surveillance System 2232.500 SGLS 7 USA 181

p/l 1 2005-004A

28537 CW carrier plus side-bands Navy Ocean Surveillance System SIGINT: Also reported to transmit at 2222.5 MHz and 2277.5 MHz - latter frequency Information contributed by the late Ivan Artner 2232.504 SGLS 7 USA 197 2007-054A

32287 CW carrier plus side-bands Geosynchronous missile early warning: Defense Support Program - Frequency Information contributed by Greg Roberts

2232.511 SGLS 7 USA 75 1991-080B

21805 FM wide-bandwidth data Geosynchronous missile early warning at 38° west longitude: Defense Support Program also transmits at 2237.5 MHz - Frequency Information contributed by the late Ivan Artner 2232.517 SGLS 7 USA 184 2006-027A

29249 CW carrier plus side-bands : Also transmits at 2277.5 MHz - Frequency Information contributed by the late Ivan Artner 2234.520 Chang'e 1 2007-051A

32273 CW carrier plus data sidebands and secondary carriers - two modes - 2 MHz bandwidth and 256 kHz bandwidth Lunar orbiting satellite: Lunar probe built and launched by the Peoples' Republic of China, originally tracked in HEO and then followed to the Moon. Mission ended 2010 Mar 1 when Chang'e made a retrograde rocket firing and impacted the lunar surface. 2235.800 Shijian

6B 2004-035B

28414 CW carrier + sidebands Science/technology experiments: Frequency reported 2008 2235.800 Shijian

6-03B 2008-053B

33409 CW carrier + sidebands Science/technology experiments: Frequency reported by other observers in 2008, but appears to be silent 2237.480 SGLS 8 USA 149 2000-024A

26356 PSK with sub-carrier, 1024 kHz Geosynchronous missile early warning at 8°.5 east longitude: Defense Support Program - Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner 2237.495 SGLS 8 USA 142 1999-017A

25669 CW carrier plus side-bands Missile early warning: Defense Support Program, suffered mission failure, satellite stranded in geosynchronous transfer orbit - Frequency Information contributed by the late Ivan Artner 2237.496 SGLS 8 USA 75 1991-080B

21805 CW carrier plus side-bands Geosynchronous missile early warning at 38° west longitude: Defense Support Program - Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner 2237.499 SGLS 8 USA 159 2001-033A

26880 PSK with sub-carrier, 1024 kHz Geosynchronous missile early warning at 70° east longitude: Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner 2237.500 SGLS 8 AMS 2 1977-044A

10033 CW - wide sweeping carrier Military meteorological satellite: Advanced Meteorological Satellite - Also transmits at 2207.5MHz and 2252.5 MHz 2237.500 SGLS 8 USA 131 1997-012A

24753 CW + side-bands Military meteorological satellite$: Defense Meteorological Satellite Program 2237.512 SGLS 8 USA 172 2003-048A

28054 CW + side-bands Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2207.5 MHz, 2222.473 MHz and 2247.415 MHz 2237.514 SGLS 8 USA 191 2006-050A

29522 CW Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2222.5 MHz and 2247.415 MHz 2237.515 SGLS 8 USA 109 1995-015A

23533 CW + side-bands Military meteorological satellite: Defense Meteorological Satellite Program 2237.517 SGLS 8 USA 147 1999-067A

25991 CW - wide sweeping carrier Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2207.535 MHz, 2252.5 MHz, 150.012 MHz and 400.032 MHz (the last two are the RADCAL frequencies) 2237.517 SGLS 8 USA 210 2009-057A

35951 CW carrier plus sidebands Military meteorological satellite: Strong carrier 2237.518 SGLS 8 OPS 3151 1977-007A

9803 CW carrier plus side-bands DSP - Missile early warning: Defunct satellite in geosynchronous 'graveyard' orbit - Frequency Information contributed by the late Ivan Artner 2241.500 Delta

Launch

Vehicle

(Second

Stage)

CW + side-bands Satellite launches: Detectable during on-orbit launch vehicle operations at start of satellite mission 2241.600 Huan Jing

1A 2008-041A

33320 CW plus data side-bands Disaster monitoring within China: Part of constellation 2242.485 SGLS 9 USA 116 1995-066A

23728 CW carrier + sidebands Digital transmission, multi-tasking reconnaissance satellite: Identified from a single radio observation (early 2008) which is not normally sufficient. However, there is significant circumstantial evidence that the identification is correct.



No longer in orbit 2242.485 SGLS 9 USA 129 1996-072A

24680 CW carrier plus side-bands Imaging reconnaissance: Possible small error in the frequency measurement 2242.485 SGLS 9 USA 161 2001-044A

26934 CW carrier + sidebands Digital transmission, multi-tasking reconnaissance satellite: - 2242.486 SGLS 9 USA 155 2000-080A

26635 PSK with sub-carrier, 1024 kHz US intelligence-related satellite near 10° west longitude: Geosynchronous orbit, frequency variable according to onboard power available - increases significantly at times of eclipse. Also transmitted at 251.325 MHz, 252.675, 258.775 and 268.775 MHz. No longer operational. 2242.493 SGLS 9 USA 8 1985-010B

15543 CW carrier plus side-bands Probably signals intelligence gathering, from geosynchronous orbit: Frequency information from Greg Roberts 2242.495 SGLS 9 USA 137 1998-005A

25148 CW carrier plus side-bands US comms and intelligence gathering: Part of a constellation of three satellites in highly eccentric orbit (HEO), switches to low power when over the southern hemisphere - formerly transmitted AFSATCOM signal near 243.7 MHz. Reported still active 2013 May. Lost to visual observers because of changes brought about gravity effects and air drag on the eccentric orbit. 2242.496 SGLS 9 USA 67 1990-097B

20963 PSK with sub-carrier, 1024 kHz Multi-tasking military satellite near 75° east longitude: Originally GEO but the orbit has evolved to an inclination of 15° and is slightly elliptical so reception varies according to the sub-satellite latitude - a study by Ivan Artner 2006 March showed that the transmitter responds to eclipse periods by becoming intermittent while out of direct sunlight, indicating that the batteries are not charging properly from the solar cells 2242.498 SGLS 9 USA 125 1996-038A

23945 CW carrier plus side-bands US comms and intelligence gathering: Formerly part of the operational constellation of three SDS satellites in highly eccentric orbit (HEO) - Also transmitted AFSATCOM signal near 243.7 MHz. The S-band transmission from USA-125, an SDS-2 satellite, was at a lower power than the SDS-3 satellites. Ceased to transmit around 2010 Aug 31 when either the transmitter was switched off, or the satellite was guided to a destructive re-entry. 2242.500 SGLS 9 USA 40 1989-061B

20167 CW carrier, oscillates in frequency due to satellite spinning at 5.2s per rev US mult--tasking intelligence-gathering and communications satellite: Tentative identification of satellite with received signals - non-operational but still transmitting, the signal oscillation is probably due to the originally de-spun aerial platform having matched rotation with the satellite body - identified as 90020 in classfd.tle 2242.500 SGLS 9 USA 89 1992-086B

22518 CW carrier plus side-bands US mult--tasking intelligence-gathering and communications satellite, now deactivated: During 2006, Ivan Artner tracked a spinning satellite in HEO, the times did not fit known satellites in that type of orbit - it has been tentatively identified as 90026 (last observed in 2004) but transmissions ceased during the first quarter of 2007 before an orbit could be determined, the identification of it as USA-89 is also tentative 2242.500 SGLS 9 USA 162 2001-046A

26948 CW carrier (plus side-bands?) US intelligence-related satellite near 144° west longitude, possibly including communications: Reported frequency for satellite in geosynchronous orbit - also reported to transmit at 250.075 MHz, 256.475, 263.225 and 267.550 MHz 2242.503 SGLS 9 USA 179 2004-034A

28384 CW carrier plus side-bands - strong US intelligence-related satellite: Part of a constellation of three satellites in highly eccentric orbit (HEO), switches to low power when over the southern hemisphere - Also transmits at 251.700 MHz and 256.375 MHz 2242.504 SGLS 9 USA 198 2007-060A

32378 CW carrier plus side-bands - strong Intelligence-related satellite, possibly including communications: Part of a constellation of three satellites in highly eccentric orbit (HEO), lanched 2007 Dec 10 as a replacement for USA-125, also transmits at 251.700 MHz and 256.375 MHz, and used 251.275 and 258.800 MHz during the orbital test phase up to 2008 Mar 13



Frequency discovered independently by Bob Christy and Sven Grahn about 20 minutes after launch. 2242.504 SGLS 9 USA 227 2011-011A

37377 Carrier + sidebands US intelligence-related satellite near 10° west longitude: Continous transmission 2242.505 SGLS 9 USA 186 2005-042A

28888 CW carrier + sidebands Reconnaissance satellite: - 2242.506 SGLS 9 USA 215 2010-046A

37162 CW Reconnaissance using radar: Discovered by Bob Christy immediately after launch 2242.506 SGLS 9 USA 234 2012-014A

38109 Carrier + sidebands Reconnaissance using radar: 2242.514 SGLS 9 USA 224 2011-002A

37348 CW carrier + sidebands Digital transmission, multi-tasking reconnaissance satellite: Discovered by Bob Christy on day of launch. Intensive radio tracking over first few days allowed good determination of the orbit for acquisition by visual observers. 2242.515 SGLS 9 USA 21 1987-015A

17506 CW carrier, oscillates in frequency due to satellite spinning at 4.6s per rev US mult--tasking intelligence-gathering and communications satellite: Identification very tentative - highly eccentric orbit, non-operational, the signal oscillation is probably due to the originally de-spun aerial platform having matched rotation with the satellite body, probably an SDS-1 satellite (either F4 or F6) - listed in classfd.tle as 90004 2242.517 SGLS 9 ASTEX 1971-089A

5560 Multiple sidebands - very small dispersion Technology experiments: Old satellite detected as still transmitting during 2008 March 2246.400 Fengyun 3A 2008-026A

32958 CW carrier + sidebands Meteorological imaging: Frequency reported 2008, also transmits 2264.700 MHz, below horizon from UK 2247.478 SGLS 10 TSX-5 2000-030A

26374 CW carrier Experiments in advanced space technologies: Frequency is unstable, noted as high as 2247.512 MHz, came back on air 2009 November 2247.499 SGLS 10 USA 208 2009-052A

35937 CW carrier plus sidebands STSS Demonstrator dual satellite mission together with USA 209 testing missile detection technology: Frequency shows variability, possibly due to internal electrical power loading. Transmission frequency sometimes locked to the uplink leading to dual Doppler effect.



See 2272.5 MHz for USA-209. 2247.500 SGLS 10 NOAA 11 1988-089A

19531 Cyclic carrier - approx 4s on then 4s off Meteorological imaging: Satellite de-commissioned and batteries disconnected 2004 Jun 22 at 16:24:28 UTC - output from STX4 transmitter detected 2009 Oct, probably powered by output from solar cells (only detectable on daylight passes) 2247.500 SGLS 10 NOAA 19 2009-005A

33591 Data Metsat: STX4 transmitter - used during launch and contingency, occasionally heard from orbit and heard to switch on and off, detected 2009 Oct 2249.500 USA 193 2006-057A

29651 CW carrier plus side-bands US intelligence-related satellite: Satellite failed soon after launch 2006 December - no longer transmitting Frequency Information contributed by the late Ivan Artner 2249.995 Chuangxin

1-02 2008-056B

33434 CW carrier + sidebands Earth observation - meteorological data for disaster relief: - 2250.000 Oceansat

P2 2009-051A

35931 CW carrier plus sidebands Ocean Studies: Sun-synchronous orbit, Indian satellite 2250.054 RISat 1 2012-017A

38248 - Radar imaging: Identified by Sven Grahn on day of launch 2250.720 Tiangong 1 2011-053A

37820 - Experimental space laboratory: Frequency reported by Richard Flagg, Hawaii. Continuous transmission. Also transmits 2232.215 MHz. 2251.446 Shijian

6-03B 2008-053B

33409 CW carrier + sidebands Science/technology experiments: Relatively strong signal 2252.490 SGLS 11 USA 95 1993-056A

22787 CW carrier plus side-bands Comms: Frequency Information contributed by the late Ivan Artner 2252.490 SGLS 11 USA 146 1999-063A

25967 PSK with sub-carrier, 1.7 MHz Comms: Frequency Information contributed by the late Ivan Artner - co-located so this may be UFO-F11 2252.493 SGLS 11 USA 127 1996-042A

23967 PSK with sub-carrier, 1.7 MHz Comms: Frequency Information contributed by the late Ivan Artner 2252.499 SGLS 11 USA 147 1999-067A

25991 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program - Also transmits at 2207.535 MHz, 2237.5 MHz, 150.012 MHz and 400.032 MHz (the last two are the RADCAL frequencies) 2252.500 SGLS 11 AMS 2 1977-044A

10033 CW carrier plus side-bands Military meteorological satellite: Advanced Meteorological Satellite - Also transmits at 2207.5 MHz and 2234.5 MHz - Frequency Information contributed by the late Ivan Artner 2252.500 SGLS 11 USA 109 1995-015A

23533 CW carrier plus side-bands Military meteorological satellite: Defense Meteorological Satellite Program, - Frequency Information contributed by the late Ivan Artner 2252.506 SGLS 11 USA 207 2009-047A

35815 CW carrier + sidebands Comms: Initial reception reported by Greg Roberts (SA) some 38 minutes after lift-off 2256.251 Shijian

6D 2006-046B

29506 CW carrier + sidebands Science/technology experiments: Weak signal 2257.500 SGLS 12 DSCS III

F-1 1982-106B

13637 CW carrier plus side-bands Comms: Possibly defunct, in geosynchronous drift orbit - Frequency Information contributed by the late Ivan Artner 2257.508 SGLS 12 USA 153 2000-065A

26575 PSK with sub-carrier, 1024 kHz Comms: Defense Satellite Communications System, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2257.511 SGLS 12 USA 167 2003-008A

27691 CW carrier plus side-bands Comms: Defense Satellite Communications System, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2257.512 SGLS 12 USA 97 1993-074A

22915 CW carrier plus side-bands Comms: Defense Satellite Communications System, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2257.530 SGLS 12 USA 81 1992-023A

21949 CW carrier plus side-bands Electronic intelligence gathering: Also transmits at 2202.5 MHz and 258.150 MHz, , frequency may be active intermittently 2262.493 SGLS 13 USA 46 1989-077A

20253 PSK with sub-carrier, 1024 kHz Comms: Frequency Information contributed by the late Ivan Artner 2262.499 SGLS 13 USA 174 2003-057A

28117 PSK with sub-carrier, 1.7 MHz Comms: Frequency Information contributed by the late Ivan Artner - co-located so this may be UFO-F10 2262.505 SGLS 13 USA 214 2010-039A

36868 CW carrier, for a period after launch, the received frequency was oscillating because of Doppler shift caused by rotation Comms: Unable to reach GEO using designated thrusters so manoeuvred to GEO over a long period using its station-keeping thrusters 2262.507 SGLS 13 USA 164 2002-001A

27168 CW carrier plus side-bands Comms: Also transmits 2267.513 MHz, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2262.509 SGLS 13 USA 99 1994-009A

22988 CW carrier plus side-bands Comms: Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2263.600 Kaguya 2007-039A

32054 CW Carrier plus side-bands Lunar orbiting satellite: Japanese built and launched lunar probe - easily detectable, can be observed locking-on to, and releasing, the uplink as it appears or disappears at the lunar limb - transmission appears to be continuous 2264.700 Fengyun 3A 2008-026A

32958 CW carrier + sidebands Meteorological imaging: Frequency reported 2008, also transmits 2246.400 MHz, below horizon from UK 2264.725 QuikScat 1999-034A

25789 CW + sidebands Ocean surface wind measurement using radar: Stop-gap mission launched to cover for a similar instrument aboard NSCAT, strong signal 2266.319 Yaogan 8 2009-072A

36121 Weak CW Remote sensing: - 2267.500 CBERS 2 2003-049A

28057 CW carrier + sidebands Remote sensing: China Brazil Earth Resources Satellite, also transmits 180.014 MHz, 480.037 MHz and 2204.400 MHz, ceased to transmit 2007 2267.500 CBERS 2B 2007-042A

32062 CW carrier + sidebands Remote sensing: China Brazil Earth Resources Satellite, also transmits 180.013 MHz and 480.033 MHz and 2204.400 MHz. No longer transmitting - switched off 2010 May 10 after an operating anomaly was detected 2010 March 2267.513 SGLS 14 USA 164 2002-001A

27168 CW carrier plus side-bands Comms: Occasional transmission - Also transmits 2262.507 MHz MHz, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner 2270.000 Chibis-M 2011-062C

38051 Lightning studies satellite: Frequency information provided by Sven Grahn 2272.514 SGLS 15 USA 209 2009-052B

35938 CW carrier plus sidebands STSS Demonstrator dual satellite mission together with USA 208 testing missile detection technology: Frequency shows variability, possibly due to internal electrical power loading. Transmission frequency sometimes locked to the uplink leading to dual Doppler effect.



See 2247.5 MHz for USA-208. 2273.520 Haiyang 1B 2007-010A

31113 CW plus data sidebands Oceanic Remote Sensing: Weak 2277.485 SGLS 16 OPS 4029 1981-107A

12930 CW carrier plus side-bands Multi-tasking military satellite at 41° west longitude?: Geosynchronous orbit Frequency Information contributed by the late Ivan Artner 2277.500 SGLS 16 USA 78 1992-006A

21873 CW carrier plus side-bands Comms: Defunct satellite in geostationary drift orbit - Frequency Information contributed by the late Ivan Artner 2277.500 SGLS 16 USA 105 1994-054A

23223 CW carrier plus side-bands Multi-tasking military satellite at 27°.5 west longitude: Frequency Information contributed by the late Ivan Artner 2277.500 SGLS 16 USA 160

p/l 1 2001-040A

26905 CW carrier plus side-bands Ocean SIGINT: Navy Ocean Surveillance System - Frequency Information contributed by the late Ivan Artner, also transmits at 2232.5 MHz 2277.500 SGLS 16 USA 181

p/l 1 2005-004A

28537 CW carrier plus side-bands Navy Ocean Surveillance System SIGINT: Navy Ocean Surveillance System, also transmits at 2222.5 MHz and 2232.5 MHz 2277.520 SGLS 16 USA 184 2006-027A

29249 CW carrier plus side-bands : Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner 2280.716 Yaogan 6 2009-021A

34839 CW carrier (+sidebands?) Digital imaging for remote sensing, government/military use: Weak, also reported at 2296.500 MHz 2282.100 Yaogan 5 2008-064A

33456 CW carrier (+sidebands?) Remote sensing, possible military connection - reportedly equipped with a synthetic aperture radar: Frequency reported 2008, also transmits 2220.476 MHz 2282.500 SGLS 17 MSX 1996-024A

23851 AM - 1 kHz tone Missile detection experiments: Midcourse Space Experiment, infrared sources with a view to improved design of missile detecting sensors - Frequency Information contributed by the late Ivan Artner 2282.500 SGLS 17 AIM 2007-015A

31304 FM NASA - atmospheric studies: Indistinct lines when viewed with SDR and software 2282.507 SGLS 17 USA 32 1988-078A

19460 CW carrier plus side-bands Electronic intelligence gathering: Observed to switch on and off and does not transmit every rev - at least while over Europe, also transmits 2202.5 MHz but transmissions at the two frequencies are not simultaneous 2285.525 ZP 1A2 2010-047C

37167 Weak CW Microelectronics studies: - 2286.000 Cosmos

2469 2010-049A

37170 Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2298.000 MHz, operates only above the northern hemisphere 2286.001 Cosmos

2422 2006-030A

29260 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2292.001 MHz, operates only above the northern hemisphere 2286.001 Cosmos

2469 2010-049A

37170 CW Missile early warning: Transmission not continuous, also transmits 2292.001 MHz 2287.500 SGLS 18 Aqua 2002-022A

27424 CW carrier + sidebands Climate research: Frequency is +/-10 kHz 2287.500 SGLS 18 Aura 2004-026A

28376 CW carrier + sidebands Climate research: Frequency is +/-10 kHz 2292.000 Cosmos

2469 2010-049A

37170 Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2298.000 MHz, operates only above the northern hemisphere 2292.001 Cosmos

2422 2006-030A

29260 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2286.001 MHz, operates only above the northern hemisphere 2292.001 Cosmos

2469 2010-049A

37170 CW Missile early warning: Transmisiion not continuous, also tranmits 2286.001 MHz 2295.650 Yaogan 1 2006-015A

29092 CW carrier (+sidebands?) Remote sensing with synthetic aperture radar, government and military: Frequency reported 2008, also transmits 2212.810 MHz. No longer active - Yaogan 1 broke into several pieces 2010 Feb 4. 2295.650 Yaogan 3 2007-055A

32289 CW carrier (+sidebands?) Remote sensing, possible military connection - reportedly equipped with a synthetic aperture radar: Frequency reported 2008, also transmits 2212.810 MHz 2296.500 Yaogan 6 2009-021A

34839 CW carrier (+sidebands?) Digital imaging for remote sensing, government/military use: Frequency reported 2008, also transmits 2280.716 MHz 2298.000 Cosmos

2388 2002-017A

27409 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmitted at at 2298.0 MHz - ceased to operate 2006 November 2298.000 Cosmos

2393 2002-059A

27613 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmitted at 2286.0 MHz - ceased to operate 2007 March 2298.000 Cosmos

2430 2007-049A

32268 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2304.0 MHz, operates only above the northern hemisphere 2298.000 Cosmos

2446 2008-062A

33447 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2304.000 MHz, operates only above the northern hemisphere 2298.525 Mars

Orbiter 2013-060A

39370 - Mars exploration: 2304.000 Cosmos

2388 2002-017A

27409 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmitted at 2298.0 MHz - ceased to operate 2006 November 2304.000 Cosmos

2393 2002-059A

27613 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmitted at 2286.0 MHz - ceased to operate 2007 March 2304.000 Cosmos

2430 2007-049A

32268 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2298.0 MHz, operates only above the northern hemisphere 2304.000 Cosmos

2446 2008-062A

33447 CW carrier plus side-bands Missile early warning: OKO satellite in highly eccentric orbit - Also transmits at 2298.000 MHz, operates only above the northern hemisphere