Satellite Radio Frequencies

S-band is that part of the frequency spectrum between 2 GHz and 4 GHz. Many satellites transmit at S-band frequencies. This S-band catalogue includes a significant number of satellites in geosynchronous orbit and a quantity in inclined, highly eccentric orbits (HEOs). However, it is much used for low orbiting satellites also.

The United States Department of Defense satellite generally, but not always, use the fixed channels of SGLS (the Space Ground Link System). There is a more-detailed list for these available from the left-hand menu.

At these frequencies, experience has shown that actual transmissions are not precisely on-frequency. Some satellites wander around in frequency, sometimes by a significant amount. It seems to depend on electrical power available through the state of battery charge, output from solar panels, or a combination of the two.

S-band Frequency List

The late Ivan Artner produced a catalogue of S-band transmitting satellites that includes several of the satellites to be found in Mike McCants's "classfd.tle" orbital elements file. Many of these have now been identified.

Ivan's data is acknowledged in appropriate places.

Freq (MHz)	Satellite	Payload	Signal Type	Notes
2202.000	Beidou 5 (Beidou 5 (2A)) 2007-011A 31115	Navigation satellite	Carrier plus multiple sidebands	Probably no longer transmitting - initially tracked from Europe but line of sight lost as it approached the operational location near 140° east
2202.447	Sicral 2001-005A 26694	Geosynchronous comsat at 16° east longitude	CW carrier plus sub-carriers at 293kHz and 297 kHz	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2202.507	USA 32 (Singleton 1) 1988-078A 19460	Electronic Intelligence Gathering similar to USA-81	CW carrier plus side-bands	Also transmits at 2282.503 MHz but transmissions at the two frequencies are not always simultaneous
2202.530	USA 81 (Singleton 3) 1992-023A 21949	Electronic Intelligence Gathering similar to USA-32	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner, also transmits at 2257.530 MHz, no longer active
2204.400	CBERS 2B 2007-042A 32062	Remote sensing	CW carrier plus data sidebands	China Brazil Earth Resources Satellite - also transmits 180.013 MHz and 480.033 MHz
2205.328	Telecom 2D 1996-044B 24209	Geosynchronous comsat at 8° west longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2207.130	Telecom 2C 1995-067A 23730	Geosynchronous comsat at 3° east longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2207.487	GFO 1998-007A 25157	Oceanography - wave height measurement	CW carrier plus side-bands	Geosat Follow On - Also transmitted at 150.012 MHz and 400.032 MHz. Ceased to transmit 2208 November.
2207.500	AMS 2 (DMSP 5D F-2) 1977-044A 10033	Military meteorological satellite - unspecified secondary payloads	CW carrier plus side-bands	Advanced Meteorological Satellite - Also transmits at 2237.5MHz and 2252.5 MHz - Frequency Information contributed by the late Ivan Artner
2209.795	Huan Jing 1B (HJ-1B) 2008-041B 33321	Disaster monitoring within China	CW plus data sidebands	Part of constellation
2212.504	Coriolis 2003-001A 27640	Oceanographic and geomagnetic studies	CW carrier plus side-bands	Also transmits at 2222.528 MHz
2212.810	Yaogan 1 2006-015A 29092	Remote sensing, possible military connection - reportedly equipped with a synthetic aperture radar	CW carrier (+sidebands?)	Does not transmit on all passes - European observations are on southbound passes (these occur between passes over the PRC mainland)
2212.810	Yaogan 3 2007-055A 32289	Remote sensing, possible military connection - reportedly equipped with a synthetic aperture radar	CW carrier (+sidebands?)	Does not transmit on all passes - European observations are on southbound passes (these occur between passes over the PRC mainland)
2217.500	STS	ISS Crew/payload transport	CW carrier plus side bands carrying data	Integrated voice and data on SGLS Channel 4 - transmitter operates almost continuously while the payload bay doors are open, also transmits at 259.7 MHz
2222.481	USA 172 (DMSP 5D-3 F-16) 2003-048A 28054	Military meteorological satellite - unspecified secondary payloads	CW carrier plus side-bands	Defense Meteorological Satellite Program - Also transmits at 2237.5 MHz and 2247.5 MHz
2222.497	USA 191 (DMSP 5D-3 F-17) 2006-050A 29522	Military meteorological satellite - unspecified secondary payloads	CW carrier plus side-bands	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	USA 173 P/L 1 (NOSS 3-2 leader) 2003-054A 28095	Navy Ocean Surveillance System SIGINT	CW carrier plus side-bands	Navy Ocean Surveillance System - Also transmits at 2232.5 MHz. Frequency Information contributed by the late Ivan Artner
2222.500	USA 181 P/L 1 (NOSS 3-3 leader) 2005-004A 28537	Navy Ocean Surveillance System SIGINT	CW carrier plus side-bands	Navy Ocean Surveillance System - also transmits at 2232.5 MHz and 2277.5 MHz - Frequency Information contributed by the late Ivan Artner
2222.502	USA 69 (Lacrosse 2) 1991-017A 21147	Military radar reconnaissance satellite	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner
2222.502	USA 133 (Lacrosse 3) 1997-064A 25017	Military radar reconnaissance satellite	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner
2222.528	Coriolis 2003-001A 27640	Oceanographic and geomagnetic studies	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner, also transmits at 2212.504 MHz
2224.065	Shenzhou 7 2008-047A 33386	Piloted spacecraft	CW carrier plus side-bands	PRC piloted spacecraft - frequency first detected during the Shenzhou 7 mission (2008 September) by Richard Flagg, Hawaii USA - transmission is probably continuous while in orbit
2227.476	NATO 4B 1993-076A 22921	Geosynchronous comsat at 35° east longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2227.481	NATO 4A 1991-001A 21047	Miltary geosynchronous comsat at 18° west longitude	PSK with sub-carrier, 1024 kHz	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2227.487	Skynet 4C 1990-079A 20776	Miltary geosynchronous comsat at 1° west longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2227.497	Skynet 4E 1999-009B 25639	Miltary geosynchronous comsat at 53° east longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2227.508	Skynet 4D 1998-002A 25134	Miltary geosynchronous comsat at 34° west longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2227.514	Skynet 4F 2001-005B 26695	UK miltary and government comsat at 6° east longitude	CW carrier plus side-bands	Geosynchronous orbit -
2232.495	USA 118 (Mercury 2) 1996-026A 23855	Multi-tasking military satellite at 13° west longitude?	CW carrier plus side-bands	geosynchonous orbit - Frequency Information contributed by the late Ivan Artner
2232.495	USA 160 P/L 1 (NOSS 3-1 leader) 2001-040A 26905	Navy Ocean Surveillance System - ocean SIGINT	CW carrier plus side-bands	Transmision may be from 26907 (NOSS3-1 follower). Also reported to transmit 2277.5 MHz
2232.496	USA 105 (Mercury 1) 1994-054A 23223	Multi-tasking military satellite at 41° west longitude?	CW carrier plus side-bands	geosynchonous orbit - Frequency Information contributed by the late Ivan Artner
2232.497	USA 159 (DSP F-21) 2001-033A 26880	Geosynchronous missile early warning at 70° east longitude	FM wide-bandwidth data	Defense Support Program also transmits at 2237.5 MHz - Frequency Information contributed by the late Ivan Artner
2232.498	USA 149 (DSP F-20) 2000-024A 26356	Geosynchronous missile early warning at 8°.5 east longitude	FM wide-bandwidth data	Defense Support Program also transmits at 2237.5 MHz - Frequency Information contributed by the late Ivan Artner
2232.498	USA 173 P/L 1 (NOSS 3-2 leader) 2003-054A 28095	Navy Ocean Surveillance System - ocean SIGINT	CW carrier plus side-bands	Transmission may be from 28097 (NOSS 3-2 follower). Also reported to transmit at 2222.5 MHz
2232.500	USA 181 P/L 1 (NOSS 3-3 leader) 2005-004A 28537	Navy Ocean Surveillance System SIGINT	CW carrier plus side-bands	Transmission may be from 28541 (NOSS 3-3 follower), also reported to transmit at 2222.5 MHz and 2277.5 MHz - latter frequency Information contributed by the late Ivan Artner
2232.500	USA 194 P/L 1 (NOSS 3-4 leader) 2007-027A 31701	Navy Ocean Surveillance System - ocean SIGINT	CW carrier + side bands	Transmission may be from the NOSS 3-4 follower
2232.504	USA 197 (DSP F-23) 2007-054A 32287	Geosynchronous missile early warning	CW carrier plus side-bands	Defense Support Program - Frequency Information contributed by Greg Roberts
2232.511	USA 75 (DSP F-16) 1991-080B 21805	Geosynchronous missile early warning at 38° west longitude	FM wide-bandwidth data	Defense Support Program also transmits at 2237.5 MHz - Frequency Information contributed by the late Ivan Artner
2232.517	USA 184 (Trumpet 4/NROL-22) 2006-027A 29249	US - military and intelligence	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	Lunar orbiting satellite	CW carrier plus data sidebands and secondary carriers - two modes - 2 MHz bandwidth and 256 kHz bandwidth	Lunar probe built and launched by the Peoples' Republic of China, originally tracked in HEO and then followed to the Moon - easily detectable with simple equipment; since arrival at the Moon, Chang'e has been transmitting internittently on command from ground stations
2237.480	USA 149 (DSP F-20) 2000-024A 26356	Geosynchronous missile early warning at 8°.5 east longitude	PSK with sub-carrier, 1024 kHz	Defense Support Program - Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner
2237.495	USA 142 (DSP F-19) 1999-017A 25669	Missile early warning	CW carrier plus side-bands	Defense Support Program, suffered mission failure, satellite stranded in geosynchronous transfer orbit - Frequency Information contributed by the late Ivan Artner
2237.496	USA 75 (DSP F-16) 1991-080B 21805	Geosynchronous missile early warning at 38° west longitude	CW carrier plus side-bands	Defense Support Program - Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner
2237.499	USA 159 (DSP F-21) 2001-033A 26880	Geosynchronous missile early warning at 70° east longitude	PSK with sub-carrier, 1024 kHz	Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner
2237.500	AMS 2 (DMSP 5D F-2) 1977-044A 10033	Military meteorological satellite - unspecified secondary payloads	CW - wide sweeping carrier	Advanced Meteorological Satellite - Also transmits at 2207.5MHz and 2252.5 MHz
2237.500	USA 131 (DMSP 5D-2 F-14) 1997-012A 24753	Military meteorological satellite - unspecified secondary payloads	CW + side-bands	Defense Meteorological Satellite Program
2237.510	USA 172 (DMSP 5D-3 F-16) 2003-048A 28054	Military meteorological satellite - unspecified secondary payloads	CW - wide sweeping carrier	Defense Meteorological Satellite Program - Also transmits at 2222.473 MHz and 2247.415 MHz
2237.515	USA 109 (DMSP 5D-2 F13) 1995-015A 23533	Military meteorological satellite - unspecified secondary payloads	CW + side-bands	Defense Meteorological Satellite Program
2237.515	USA 191 (DMSP 5D-3 F-17) 2006-050A 29522	Military meteorological satellite - unspecified secondary payloads	CW - wide sweeping carrier	Defense Meteorological Satellite Program - Also transmits at 2222.5 MHz and 2247.415 MHz
2237.517	USA 147 (DMSP F-15) 1999-067A 25991	Military meteorological satellite with secondary payloads (one is a pair of RADCAL transmitters)	CW - wide sweeping carrier	Defense Meteorological Satellite Program - Also transmits at 2252.5 MHz, 150.012 MHz and 400.032 MHz (the last two are the RADCAL frequencies)
2237.517	USA 210 (DMSP 5D-3 F-18) 2009-057A 35951	Meteorological observations	CW carrier plus sidebands	Strong carrier
2237.518	DSP F7 (DSP 9) 1977-007A 9803	DSP - Missile early warning	CW carrier plus side-bands	Defunct satellite in geosynchronous 'graveyard' orbit - Frequency Information contributed by the late Ivan Artner
2241.500	Delta Launch Vehicle (Second Stage)	Satellite launches	CW + side-bands	Detectable during on-orbit launch vehicle operations at start of satellite mission
2241.600	Huan Jing 1A (HJ-1A) 2008-041A 33320	Disaster monitoring within China	CW plus data side-bands	Part of constellation
2242.473	USA 172 (DMSP 5D-3 F-16) 2003-048A 28054	Military meteorological satellite - unspecified secondary payloads	CW carrier plus side-bands	Defense Meteorological Satellite Program - Also transmits at 2249.415 MHz and 2237.5 MHz - Frequency Information contributed by the late Ivan Artner
2242.482	USA 129 (Improved Crystal/KH-12-3) 1996-072A 24680	US - military and intelligence	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner
2242.482	USA 186 (KH-12-5/Crystal) 2005-042A 28888	US - military and intelligence	CW carrier plus side-bands	Possible transmission frequency - Frequency Information contributed by the late Ivan Artner
2242.485	Unknown	Not known	CW (plus sidebands?)	Satellite in LEO
2242.486	USA 155 (SDS-3 F1) 2000-080A 26635	US intelligence-related satellite at 10° west longitude, possibly including communications	PSK with sub-carrier, 1024 kHz	Geosynchronous orbit, Frequency varies according to solar illumination and can occasionally be found as low as 2242.47 MHz - also transmits at 251.325 MHz, 252.675, 258.775 and 268.775 MHz
2242.493	USA 8 (Magnum 1) 1985-010B 15543	Probably signals intelligence gathering, from geosynchronous orbit	CW carrier plus side-bands	Frequency information from Greg Roberts
2242.495	USA 137 (SDS-2 F5) 1998-005A 25148	US mult--tasking intelligence-gathering and communications satellite	CW carrier plus side-bands	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
2242.496	USA 67 (SDS-2 F2) 1990-097B 20963	Multi-tasking military satellite near 75° east longitude	PSK with sub-carrier, 1024 kHz	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	USA 125 (SDS-2 F4) 1996-038A 23945	US mult--tasking intelligence-gathering and communications satellite	CW carrier plus side-bands	Formerly part of the operational constellation of three SDS satellites in highly eccentric orbit (HEO) - Also transmits AFSATCOM signal near 243.7 MHz; the S-band transmission from USA-125, an SDS-2 satellite, is at a lower power than the SDS-3 satellites
2242.500	USA 40 (SDS 2 F1/90020 ) 1989-061B 20167	US mult--tasking intelligence-gathering and communications satellite	CW carrier, oscillates in frequency due to satellite spinning at 5.2s per rev	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	USA 89 (SDS 2 F3) 1992-086B 22518	US mult--tasking intelligence-gathering and communications satellite, now deactivated	CW carrier plus side-bands	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	USA 162 (SDS-3 F2) 2001-046A 26948	US intelligence-related satellite near 144° west longitude, possibly including communications	CW carrier (plus side-bands?)	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	USA 179 (SDS-3 F3) 2004-034A 28384	US mult--tasking intelligence-gathering and communications satellite	CW carrier plus side-bands - strong	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	USA 198 (SDS-3 F4) 2007-060A 32378	US mult--tasking intelligence-gathering and communications satellite	CW carrier plus side-bands - strong	Part of a constellation of three satellites in highly eccentric orbit (HEO), lanched 2007 Dec 10 as a replacement for USA-125, the other satellites are USA-137 and USA-179, also transmits at 251.700 MHz and 256.375 MHz - was transmitting at 251.275 and 258.800 MHz during the orbital test phase up to 2008 Mar 13
2242.515	USA 21 (SDS-1 F6/90004) 1987-015A 17506	US mult--tasking intelligence-gathering and communications satellite	CW carrier, oscillates in frequency due to satellite spinning at 4.6s per rev	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	ASTEX (P71-2) 1971-089A 5560	Technology experiments	Multiple sidebands - very small dispersion	Old satellite detected as still transmitting during 2008 March
2247.478	TSX-5 2000-030A 26374	Experiments in advanced spae technologies	CW carrier	Frequency is unstable, noted as high as 2247.512 MHz, came back on air 2009 November
2247.499	USA 208 (STSS Demo SV1) 2009-052A 35937	Ballistic missile detection tests	CW carrier plus sidebands	STSS Demonstrators dual satellite mission with USA 209 testing missile detection technology, variation possibly due to internal electrical power loading - see also 2272.5 MHz
2247.500	NOAA 11 (NOAA H) 1988-089A 19531	Metsat	Cyclic carrier - approx 4s on then 4s off	De-commissioned, faulty transmssion from TIP, detected 2009 Oct, although a frequency in the SGLS - NOAA 11 probably never transmitted SGLS format signals
2247.500	NOAA 19 (NOAA N') 2009-005A 33591	Metsat	Data	Downlink for TIP data - used during launch and contingency, occasionally heard from orbit and heard to switch on and off, detected 2009 Oct, although a frequency corresponding to SGLS Channel 10, the transmission format is not SGLS
2249.500	USA 193 (NROL-21) 2006-057A 29651	US intelligence-related satellite	CW carrier plus side-bands	Satellite failed soon after launch 2006 December - no longer transmitting Frequency Information contributed by the late Ivan Artner
2250.000	Oceansat 2 2009-051A 35931	Ocean Studies	CW carrier plus sidebands	Sun-synchronous orbit, Indian satellite
2252.490	USA 95 (UFO F- 2) 1993-056A 22787	Miltary geosynchronous comsat at 29° east longitude	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner
2252.490	USA 146 (UFO F-10) 1999-063A 25967	Miltary geosynchronous comsat at 72° east longitude	PSK with sub-carrier, 1.7 MHz	Frequency Information contributed by the late Ivan Artner - co-located so this may be UFO-F11
2252.493	USA 127 (UFO F- 7) 1996-042A 23967	Miltary geosynchronous comsat at 22° west longitude	PSK with sub-carrier, 1.7 MHz	Frequency Information contributed by the late Ivan Artner
2252.499	USA 147 (DMSP F-15) 1999-067A 25991	Military meteorological satellite with secondary payloads (one is a pair of RADCAL transmitters)	CW carrier plus side-bands	Defense Meteorological Satellite Program - Also transmits at 2237.5 MHz, 150.012 MHz and 400.032 MHz (the last two are the RADCAL frequencies)
2252.500	AMS 2 (DMSP 5D F-2) 1977-044A 10033	Military meteorological satellite - unspecified secondary payloads	CW carrier plus side-bands	Advanced Meteorological Satellite - Also transmits at 2207.5 MHz and 2234.5 MHz - Frequency Information contributed by the late Ivan Artner
2252.500	USA 109 (DMSP 5D-2 F13) 1995-015A 23533	Military meteorological satellite - unspecified secondary payloads	CW carrier plus side-bands	Defense Meteorological Satellite Program, - Frequency Information contributed by the late Ivan Artner
2252.506	USA 207 (PAN) 2009-047A 35815	Communications	CW carrier + sidebands	Initial reception reported by Greg Roberts (SA) some 38 minutes after lift-off
2257.500	DSCS III F-1 (DSCS III A-1) 1982-106B 13637	USA DoD comsat	CW carrier plus side-bands	Possibly defunct, in geosynchronous drift orbit - Frequency Information contributed by the late Ivan Artner
2257.508	USA 153 (DSCS III F-12) 2000-065A 26575	Miltary geosynchronous comsat at 12° west longitude	PSK with sub-carrier, 1024 kHz	Defense Satellite Communications System, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2257.511	USA 167 (DSCS III F-13) 2003-008A 27691	Miltary geosynchronous comsat at 60° east longitude	CW carrier plus side-bands	Defense Satellite Communications System, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2257.512	USA 97 (DSCS III F-8) 1993-074A 22915	Miltary geosynchronous comsat at 57° east longitude	CW carrier plus side-bands	Defense Satellite Communications System, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2257.530	USA 81 (Singleton 3) 1992-023A 21949	Electronic Intelligence Gathering similar to USA-32	CW carrier plus side-bands	Also transmits at 2202.5 MHz (Frequency Information contributed by the late Ivan Artner) and 258.150 MHz, no longer active
2262.493	USA 46 (FltSatCom F-8) 1989-077A 20253	Miltary geosynchronous comsat at 15°.5 west longitude	PSK with sub-carrier, 1024 kHz	Frequency Information contributed by the late Ivan Artner
2262.499	USA 174 (UFO F-11) 2003-057A 28117	Miltary geosynchronous comsat at 72° east longitude	PSK with sub-carrier, 1.7 MHz	Frequency Information contributed by the late Ivan Artner - co-located so this may be UFO-F10
2262.507	USA 164 (Milstar 5) 2002-001A 27168	Miltary geosynchronous comsat at 28°.5 east longitude	CW carrier plus side-bands	Also transmits 2267.513 MHz, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2262.509	USA 99 (Milstar 1) 1994-009A 22988	Miltary geosynchronous comsat at 39° west longitude	CW carrier plus side-bands	Geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2263.600	Kaguya (Selene) 2007-039A 32054	Lunar orbiting satellite	CW Carrier plus side-bands	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
2264.725	QuikScat 1999-034A 25789	Ocean surface wind measurement using radar	CW + sidebands	Stop-gap mission launched to cover for a similar instrument aboard NSCAT, strong signal
2267.513	USA 164 (Milstar 5) 2002-001A 27168	Miltary geosynchronous comsat at 28°.5 east longitude	CW carrier plus side-bands	Occasional transmission - Also transmits 2262.507 MHz MHz, geosynchronous orbit - Frequency Information contributed by the late Ivan Artner
2272.514	USA 209 (STSS Demo SV2) 2009-052B 35938	Ballistic missile detection tests	CW carrier plus sidebands	STSS Demonstrators dual satellite mission with USA 208 testing missile detection technology, frequency is not fixed, variation possibly due to internal electrical power loading - see also 2247.5 MHz
2273.520	Haiyang 1B 2007-010A 31113	Oceanic Remote Sensing	CW plus data sidebands	Weak
2277.485	OPS 4029 (Vortex 3) 1981-107A 12930	Multi-tasking military satellite at 41° west longitude?	CW carrier plus side-bands	Geosynchronous orbit Frequency Information contributed by the late Ivan Artner
2277.500	USA 78 (DSCS III F-5) 1992-006A 21873	USA DoD comsat	CW carrier plus side-bands	Defunct satellite in geostationary drift orbit - Frequency Information contributed by the late Ivan Artner
2277.500	USA 105 (Mercury 1) 1994-054A 23223	Multi-tasking military satellite at 27°.5 west longitude	CW carrier plus side-bands	Frequency Information contributed by the late Ivan Artner
2277.500	USA 160 P/L 1 (NOSS 3-1 leader) 2001-040A 26905	Navy Ocean Surveillance System - ocean SIGINT	CW carrier plus side-bands	Navy Ocean Surveillance System - Frequency Information contributed by the late Ivan Artner, also transmits at 2232.495 MHz
2277.500	USA 181 P/L 1 (NOSS 3-3 leader) 2005-004A 28537	Navy Ocean Surveillance System SIGINT	CW carrier plus side-bands	Navy Ocean Surveillance System, also transmits at 2222.5 MHz and 2232.5 MHz - Frequency Information contributed by the late Ivan Artner
2277.520	USA 184 (Trumpet 4/NROL-22) 2006-027A 29249	US intelligence-related satellite	CW carrier plus side-bands	Also transmits at 2232.5 MHz - Frequency Information contributed by the late Ivan Artner
2282.500	MSX 1996-024A 23851	Experiments satellite	AM - 1 kHz tone	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	AIM (Aeronomy of Ice in the Mesosphere) 2007-015A 31304	NASA - atmospheric studies	FM	Indistinct lines when viewed with SDR and software
2282.503	USA 32 (Singleton 1) 1988-078A 19460	Electronic Intelligence Gathering similar to USA-81	CW carrier plus side-bands	Observed to switch on and off and does not transmit every rev - at least while over Europe, also transmits 2202.507 MHz but transmissions at the two frequencies are not always simultaneous
2286.001	Cosmos 2422 (OKO) 2006-030A 29260	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmits at 2292.001 MHz, operates only above the northern hemisphere
2292.001	Cosmos 2422 (OKO) 2006-030A 29260	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmits at 2298.001 MHz, operates only above the northern hemisphere
2298.000	Cosmos 2388 (OKO) 2002-017A 27409	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmitted at at 2298.0 MHz - ceased to operate 2006 November
2298.000	Cosmos 2393 (OKO) 2002-059A 27613	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmitted at 2286.0 MHz - ceased to operate 2007 March
2298.000	Cosmos 2430 (Oko US-KS?) 2007-049A 32268	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmits at 2304.0 MHz, operates only above the northern hemisphere
2298.000	Cosmos 2446 (73D6/US-KS/OKO) 2008-062A 33447	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmits at 2304.000 MHz, operates only above the northern hemisphere
2304.000	Cosmos 2388 (OKO) 2002-017A 27409	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmitted at 2298.0 MHz - ceased to operate 2006 November
2304.000	Cosmos 2393 (OKO) 2002-059A 27613	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmitted at 2286.0 MHz - ceased to operate 2007 March
2304.000	Cosmos 2430 (Oko US-KS?) 2007-049A 32268	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmits at 2298.0 MHz, operates only above the northern hemisphere
2304.000	Cosmos 2446 (73D6/US-KS/OKO) 2008-062A 33447	Missile early warning satellite	CW carrier plus side-bands	OKO satellite in highly eccentric orbit - Also transmits at 2298.000 MHz, operates only above the northern hemisphere