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 work is acknowledged in appropriate places.

Freq (MHz)	Satellite	Transmission	Notes
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21949	CW carrier plus side-bands	Electronic intelligence gathering: Also transmits at 2257.530 MHz, thought to be no longer active but detected early 2011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