Transmissions at S-band

Freq (MHz)

Satellite

Payload

Signal Type

Notes

2202.000

Beidou 5
(Beidou 5 (2A))

2007-011A
31115

Navigation satellite

Carrier plus multiple sidebands

Transmission status not known - 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Frequency Information contributed by the late Ivan Artner, also transmits at 2257.530 MHz, no longer active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

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

Sweeping CW carrier plus side-bands

Defense Meteorological Satellite Program - Also transmits at 2242.473 MHz, 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)

2003-054A
28095

Navy Ocean Surveillance System SIGINT

CW carrier plus side-bands

Navy Ocean Surveillance System - Also transmits at 2232.5 MHzFrequency Information contributed by the late Ivan Artner

2222.500

USA 181 P/L 1
(NOSS 3-3)

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)

2001-040A
26905

Navy Ocean Surveillance System SIGINT

CW carrier + side-bands

Also transmits at 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

2232.499

USA 173 P/L 1
(NOSS 3-2)

2003-054A
28095

Navy Ocean Surveillance System SIGINT

CW carrier plus side-bands

Also transmits at 2222.5 MHzFrequency Information contributed by the late Ivan Artner

2232.500

USA 181 P/L 1
(NOSS 3-3)

2005-004A
28537

Navy Ocean Surveillance System SIGINT

CW carrier plus side-bands

Also transmits at 2222.5 MHz and 2277.5 MHz - Frequency Information contributed by the late Ivan Artner

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

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

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 F2)

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 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

2242.495

USA 137
(SDS-3 F1)

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

2242.498

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

Unknown

Not known

Periodic bursts (approx 1.5-2 hour intervals) of signal, sweeping upwards in frequency

Possibly a satellite in GEO with rotation on at least two axes

2242.500

USA 40
(SDS-2 1)

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 2-3)

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 F5)

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 F4)

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 F5)

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)

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

2247.415

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 2242.473 MHz and 2237.5 MHz - Frequency Information contributed by the late Ivan Artner

2247.415

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 2222.497 MHz and 2237.515 MHz

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

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 (information contributed by the late Ivan Artner), 150.012 MHz and 400.032 MHz

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

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

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)

2001-040A
26905

Navy Ocean Surveillance System 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)

2005-004A
28537

Navy Ocean Surveillance System SIGINT

CW carrier plus side-bands

Navy Ocean Surveillance System, lso transmits at 2224.5 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

2282.503

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

2286.000

Cosmos 2422
(OKO)

2006-030A
29260

Missile early warning satellite

CW carrier plus side-bands

OKO satellite in highly eccentric orbit - Also transmits at 2292.0 MHz, operates only above the northern hemisphere

2292.000

Cosmos 2422
(OKO)

2006-030A
29260

Missile early warning satellite

CW carrier plus side-bands

OKO satellite in highly eccentric orbit - Also transmits at 2298.0 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