Freq (MHz)

Satellite

Payload

Signal Type

Notes

121.750

Soyuz

ISS Crew transport

Medium bandwidth FM voice

Frequency used during on-orbit operations to and from the Space Station, and reportedly used for recovery beacon during landing module descent

Also transmits at 166 MHz and 922.763 MHz

121.750

Progress

ISS Logistics

Ranging pulses

Used by TORU remote control docking system as the return signal path to ISS (see also 130.167 MHz for the ISS transmission)

Also transmits at 166 MHz and 922.763 MHz

130.167

ISS (Zarya)

1998-67A
25544

ISS module

Medium bandwidth FM voice

VHF-2 channel used as an alternative to VHF-1 (143.625 MHz) during Shuttle/ISS on-orbit operations

Also used in parallel with VHF-1 at other times

130.167

ISS

1998-67A
25544

Space Station

Ranging pulses

Used by TORU remote control docking system, usually tested 1-2 days before a Progress docking is due, the Progress return path is at 121.750 MHz

136.235

TIROS 10

1965-51A
1430

Meteorology

AM - 1.3 kHz tone

Payload now inactive, radio transmission is not continuous
(information contributed by Michael D Kenny)

136.260

OV5-3 (ERS-20)

1967-40D
2768

USAF test satellite

AM - tone (unstable)

High orbit, visible for long periods of time
(information contributed by Michael D Kenny)

136.410

ISIS 1

1969-9A
3669

Ionosphere studies

CW

(information contributed by Michael D Kenny)

136.440

ERS 15

1966-77B
2411

Military satellite

AM with 1.3 kHz tone

Incorrectly catalogued ny NORAD as SECOR 7
(information contributed by Michael D Kenny)

136.500

Nimbus 4

1970-25A
4362

Meteorology (including imaging)

CW - sometimes modulated

Payload no longer operational
(information contributed by Michael D Kenny)

136.650

OSCAR O-2

1964-83D
965

Navigation

CW Carrier plus telemetry tones

Second operational TRANSIT navsat, navigation system failed soon after launch in 1962
(information contributed by Michael D Kenny)

136.695

Shinsei

1971-80A
5485

Japanese scientific satellite

CW

Continuous transmission
(information contributed by Michael D Kenny)

136.770

NOAA 9

1984-123A
15427

Formerly meteorological imaging

CW

Telemetry frequency, transmission is intermittent
(information contributed by Michael D Kenny)

Also has a transmission at 137.500 MHz

136.800

Solrad 7B

1965-16D
1291

Solar radiation studies (launched 1969)

AM IRIG telemetry channels

Continuous transmission
(information contributed by Michael D Kenny)

137.080

DoD payload

1971-110C
5680

US military satellite

CW

(information contributed by Michael D Kenny)

137.100

NOAA 18

2005-18A
28654

Meteorological imaging

APT at 4 lines per second - interlaced visible light and infrared images

Revised frequency as of 2006 Jan 4, changed from 137.9125 MHz

137.142

Eutelsat F-1-4 (ECS-4)

1987-78B
18351

Defunct comsat

CW

Regular, intermittent signal possibly due to vehicle rotation causing periodic flow of power from solar panels

137.200

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies,individual satellites switch between them

Also transmits at 400.100 MHz

137.225

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies,individual satellites switch between them

Also transmits at 400.100 MHz

137.250

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies,individual satellites switch between them

Also transmits at 400.100 MHz

137.300

Russian Imaging Satellites

Meteorological imaging

APT at 2 lines per second

Frequency not currently active

137.350

Compass 2

2006-19A
29157

Russian scientific satellite studying possible ways of predicting earthquakes - not operating properly

CW/AM

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

137.350

NOAA 15

1998-30A
25338

Meteorological imaging

CW Doppler Beacon and telemetry

Continuous transmission -(information contributed by Michael D Kenny)

Also transmits at 137.500 MHz

137.350

NOAA 16

2000-55A
26536

Formerly meteorological imaging

CW Doppler Beacon and telemetry

Continuous transmission -(information contributed by Michael D Kenny)

Also transmits at 137.500 MHz

137.380

Timation 2

1969-82B
4256

Navigation technology

Mixed modulation (PAM/FM/AM)

(information contributed by Michael D Kenny)

137.400

Russian Imaging Satellites

Meteorological imaging

APT at 2 lines per second

Frequency not currently active

137.410

S69-4

1969-82E
4237

USAF test satellite

CW

(information contributed by Michael D Kenny)

137.440

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies, individual satellites switch between them

Also transmits at 400.100 MHz

137.460

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies, individual satellites switch between them

Also transmits at 400.100 MHz

137.500

NOAA 12

1991-32A
21263

Meteorological imaging

APT at 4 lines per second - interlaced visible light and infrared images

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

1998-30A
25338

Meteorological imaging

APT at 4 lines per second - interlaced visible light and infrared images

Switched off occasionally when transmissions conflict with those from NOAA 12

Also transmits at 137.350 MHz

137.500

NOAA 6

1979-57A
11416

Meteorological imaging

CW - carrier only

Inactive satellite but reportedly transmitting

137.500

NOAA 9

1984-123A
15427

Formerly meteorological imaging

Tone for 6 seconds out of every 25 seconds (periods vary - these are averages)

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

TIROS N

1978-98A
11060

Meteorological imaging

CW - carrier only

Inactive satellite but reportedly transmitting

137.625

NOAA 14

1994-89A
23455

Meteorological imaging

APT at 4 lines per second - interlaced visible light and infrared images

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

2002-32A
27453

Meteorological imaging

APT at 4 lines per second - interlaced visible light and infrared images

Switched off occasionally when transmissions conflict with those from NOAA 14

137.663

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies - individual satellites switch between them

Also transmits at 400.100 MHz

137.688

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies - individual satellites switch between them

Also transmits at 400.100 MHz

137.713

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies - individual satellites switch between them

Also transmits at 400.100 MHz

137.738

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies - individual satellites switch between them

Also transmits at 400.100 MHz

137.770

NOAA 11

1988-89A
19531

Formerly meteorological imaging

CW Doppler Beacon and telemetry

Continuous transmission when operational
(information contributed by Michael D Kenny)
De-commissioned 2004 June 16

137.770

NOAA 12

1991-32A
21263

Meteorological imaging

CW Doppler Beacon and telemetry

Also transmitted at 137.500 MHz
De-commissioned 2007 Aug 10

137.770

NOAA 14

1994-89A
23455

Meteorological imaging

CW Doppler Beacon and telemetry

Also transmits at 137.625 MHz
Decommissioned 2007 May 23

137.770

NOAA 17

2002-32A
27453

Meteorological imaging

CW Doppler Beacon and telemetry

Also transmits at 137.625 MHz

137.800

Orbcomm

Mobile telephony

Digitised telephone traffic

One of several frequencies - individual satellites switch between them

Also transmits at 400.100 MHz

137.850

Russian Imaging Satellites

Meteorological imaging

APT at 2 lines per second

Frequency not currently active

137.913

NOAA 18

2005-18A
28654

Meteorological imaging

APT at 4 lines per second - interlaced visible light and infrared images

Frequency probably not active - changed to 137.100 MHz (2006 Jan 4?)

143.625

ISS (Zarya)

1998-67A
25544

ISS module

Medium bandwidth FM voice

VHF-1 channel, sometimes used in parallel with VHF-2 (130.167 MHz)

Also used to relay Mission Control transmissions to the Space Shuttle during on-orbit operations with the ISS

As part of the ISS Early Communications System, this frequency was used over the USA to communicate through the Wallops Facility and White Sands, and it was detected carrying packet data transmissions (operational data - not Amateur Radio) during Expedition 1 but is no longer used in this mode

145.800

ISS

1998-67A
25544

Space Station

Amateur Radio downlink frequency

ISS amateur radio frequency used for voice (both as a repeater and as a crew Amateur downlink), previously also used for packet data - uplinks are 145.200 MHz (Europe, Africa, Middle East and Northern Asia), and 144.49 MHz (rest of the world) - an uplink at 437.800 MHz can also be used to cross-connect to the downlink in repeater mode

(Information correct as of 2008 January see NASA's ARISS Page)

145.825

ISS

1998-67A
25544

Space Station

Amateur Radio downlink frequency

ISS amateur radio frequency used for packet data - the same frequency is used worldwide for both the uplink and the downlink

(Information correct as of 2008 January see NASA's ARISS Page)

145.990

Radioskaf/ Suitsat

2005-35C
28933

Amateur radio experiment - life expired Orlan spacesuit equipped with a radio transmitter and released from ISS during a crew EVA

NFM - extremely weak

Faint 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
no longer active

149.910

Cosmos 2398

2003-23A
27818

Navigation (+ comms?)

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz

Transmission contains an almanac for all active satellites in the constellation

Use for navigation has probably ceased but is still supporting whatever other system requires reasonably precise positional information for the satellites

Coherent transmission at 399.760 MHz

149.940

Cosmos 2378

2001-23A
26818

Navigation (+ comms?)

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz

Transmission contains an almanac for all active satellites in the constellation

Use for navigation has probably ceased but is still supporting whatever other system requires reasonably precise positional information for the satellites

Coherent transmission at 399.840 MHz

149.970

Cosmos 2389

2002-26A
27436

Navigation (+ comms?)

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz

Transmission contains an almanac for all active satellites in the constellation

Use for navigation has probably ceased but is still supporting whatever other system requires reasonably precise positional information for the satellites

Coherent transmission at 399.920 MHz

149.979

Oscar 29 (Transit)

1987-80B
18362

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

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 (Transit)

1988-74B
19420

Ionospheric modelling for US military (NIMS)

FM telemetry (tones) +/- 2.4 kHz from carrier

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 23 (Transit)

1988-33A
19070

Ionospheric modelling for US military (NIMS)

FM telemetry (tones) +/- 2.4 kHz from carrier

Operational frequency

Coherent transmission at 399.968 MHz

Occasionally changes between this frequency and the maintenance one)

149.988

Oscar 25 (Transit)

1988-74A
19419

Ionospheric modelling for US military (NIMS)

FM telemetry (tones) +/- 2.4 kHz from carrier

Operational frequency

Coherent transmission at 399.968 MHz

Occasionally changes between this frequency and the maintenance one)

149.988

Oscar 27 (Transit)

1987-80A
18361

Ionospheric modelling for US military (NIMS)

FM telemetry (tones) +/- 2.4 kHz from carrier

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 32 (Transit)

1988-33B
19071

Ionospheric modelling for US military (NIMS)

FM telemetry (tones) +/- 2.4 kHz from carrier

Operational frequency

Coherent transmission at 399.968 MHz

Occasionally changes between this frequency and the maintenance one)

150.000

Tsikada and Nadezhda

Navigation - plus Search and Rescue monitoring

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz

Several satellites - the system is no longer operational, has been silent since 2003 November 26

Coherent transmission at 400.000 MHz

150.012

ARGOS

1999-8A
25634

USAF space experiments

CW - Doppler tracking beacon

Coherent transmission at 400.032 MHz

Ceased to transmit 2003

150.012

Geosat

1985-21A
15595

Oceanography - wave height measurement

CW - Doppler tracking beacon

Detected being switched on and off over Europe, not continuously active

Coherent transmission at 400.032 MHz

150.012

GFO

1998-7A
25157

Oceanography - wave height measurement

CW - Doppler tracking beacon

Geosat Follow On satellite

Coherent transmission at 400.032 MHz and also transmits at 2207.5 MHz

150.012

PicoSat 9

2001-43B
26930

USAF Space Test Program (STEP)

CW - Doppler tracking beacon

Coherent transmission at 400.032 MHz

Ceased to transmit late-2004

150.012

RADCAL

1993-41A
22698

Radar calibration

CW - Doppler tracking beacon

Radar Calibration satellite

Coherent transmission at 400.032 MHz, operation is intermittent

150.012

USA-147 (DMSP F-15)

1999-67A
25991

RADCAL secondary payload aboard US military metsat

CW - Doppler tracking beacon

Defense Meteorological Satellite Program

Also transmits at 2237.5 MHz and 2252.5 MHz (information contributed by the late Ivan Artner), 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

150.030

Cosmos 2361

1998-76A
25590

Navigation (+ comms?)

FM time and position information - sidebands at 3 kHz, 5 kHz and 7 kHz

Coherent transmission at 400.080 MHz

150.300

Cosmos 2373

2000-58A

Yantar/Cometa' recoverable satellite - photographic mapping

AM telemetry - wide bandwidth

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

2005-34A
28841

Yantar/Cometa' recoverable satellite - wide-area photographic reconnaissance

CW - Doppler tracking beacon

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

Progress

ISS logistics

FM telemetry - sidebands at +/- 128 kHz

Transmits during on-orbit operations to and from the ISS, and while docked with the space station

The transmission sounds as a loud buzz with sharp peaks at the sideband frequencies

Also transmits at 922.763 MHz

166.000

Soyuz

ISS Crew transport

FM telemetry - sidebands at +/- 128 kHz

Transmits during on-orbit operations to and from the ISS, and while docked with the space station

The transmission sounds as a loud buzz with sharp peaks at the sideband frequencies

Also transmits at 121.750 MHz and 922.763 MHz

179.951

Jiang Bing 3A (Zi-Yuan 2)

2000-50A
26481

Remote Sensing

CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz- and further carriers at +/- 40 kHz

Coherent transmission at 479.865 MHz

180.006

Fengyun 1C

1999-25A
25730

Meteorological imaging

CW carrier on centre frequency plus telemetry sidebands at +/- 5 kHz- and further carriers at +/- 10 kHz

Active transmitter until 2007 February when attacked in ground-based interceptor test

Coherent transmission at 480.017 MHz

180.007

Fengyun 1D

2002-24A
27431

Meteorological Imaging

CW carrier on centre frequency plus telemetry sidebands at +/- 5 kHz- and further carriers at +/- 10 kHz

Coherent transmission at 480.017 MHz

180.011

CBERS 1 (Zi-Yuan 1)

1999-57A
25940

Remote sensing

CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz - and further carriers at +/- 40 kHz

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

2007-42A
32062

Remote sensing

CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz- and further carriers at +/- 40 kHz

China Brazil Earth Resources Satellite

Coherent transmission at 480.033 MHz

180.014

CBERS 2A

2003-49A
28057

Remote sensing

CW carrier on centre frequency plus telemetry sidebands at +/- 20 kHz- and further carriers at +/- 40 kHz

China Brazil Earth Resources Satellite

Coherent transmission at 480.037 MHz

Ceased to transmit 2007

243.695

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 1 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.695

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 1 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.705

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 2 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.705

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 2 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.710

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 3 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.710

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 3 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.715

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 4 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.715

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 4 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.720

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 5 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.720

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 5 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.725

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 6 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.725

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 6 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.730

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 7 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.730

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 7 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.735

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 8 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.735

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 8 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.740

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

Channel usually occupied by an unmodulated carrier

AFSATCOM Channel 9 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.740

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

Channel usually occupied by an unmodulated carrier

AFSATCOM Channel 9 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.745

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 10 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.745

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 10 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.750

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 11 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.750

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 11 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.760

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 12 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

Early in 2007, USA-137 ceased to transmit AFSATCOM

243.760

USA-125 (SDS-2 F4)

1996-38A
23945
90028 (classfd.tle)

Military quick reaction comms

CW - RTTY-style data

AFSATCOM Channel 12 transmission

2005-2007, USA-137 and USA-125 were providing alternating coverage of the northern hemisphere from HEO

Second transmission frequency at 2242.50 MHz

2007 Oct 15, USA-125 ceased to transmit AFSATCOM

243.808

Unknown

USA Military communications

Spread spectrum signal - +/- 26 kHz from centre frequency

Satellite (may be more than one) in geosynchronous orbit, can be heard with relatively simple receiver/antenna setup - in CW mode, it sounds like trickling water!

250.075

Unknown (SDS-2?)

US intelligence-related satellite near 140° west longitude, possibly including communications

AM - 4.8 kHz data tone

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

NOSS 2-3 (cluster of 3 satellites)

1996-29D
23862

US Military ocean surveillance

Spread spectrum transmission with modulated signal at 9.6 kHz intervals - total spread is +/- 50 kHz

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)

250.158

NOSS 2-2 (cluster of 3 satellites)

1991-76D
21808

US Military ocean surveillance

CW carrier detectable at 250.158 MHz then a series weaker carriers up and down from this frequency at approx 10 kHz intervals between approximate limits of 250.0 and 250.25 MHz

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)

251.275

USA-198 (SDS-3 F5)

2007-60A
32378

US mult--tasking intelligence-gathering and communications satellite

Data transmission (possibly in test mode)

Transmissions from a secondary payload on US classified satellite in HEO

Switched on and off near 44 degrees north latitude to provide eight hours near-continuous transmission

Also transmits at 258.800 MHz and 2242.5 MHz

251.325

USA-155 (SDS-3 F2)

2000-80A
26633
(90043 in classfd.tle)

US intelligence-related satellite near 10° west longitude, possibly including communications

AM - 4.8 kHz data tone

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

251.700

USA-179 (SDS-3 F4)

2004-34A
28384
(90027 in classfd.tle)

US intelligence-related satellite, possibly including communications

AM - 4.8 kHz data tone

One of a pair of transmissions from a secondary payload on US classified satellite in HEO

Switched on and off near 44 degrees north latitude to provide eight hours near-continuous transmission, it is similar to transmissions from USA-155

Also transmits at 256.375 MHz and 2242.50 MHz

252.675

USA-155 (SDS-3 F2)

2000-80A
26633
(90043 in classfd.tle)

US intelligence-related satellite near 10° west longitude, possibly including communications

AM - high speed (19.2 kb/s?) data transmission

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

256.375

USA-179 (SDS-3 F4)

2004-34A
28384
(90027 in classfd.tle)

US intelligence-related satellite - possibly including communications

AM - 4.8 kHz data tone

One of a pair of transmissions from a secondary payload on US classified satellite in HEO


Switched on and off near 44 degrees north latitude to provide eight hours near-continuous transmission, it is similar to transmissions from USA-155

Also transmits at 251.700 MHz and 2242.50 MHz

256.475

Unknown (SDS-2?)

US intelligence-related satellite near 140° west longitude, possibly including communications

AM - 4.8 kHz data tone

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

1992-23A
21949

Electronic Intelligence Gathering similar to USA-32

AM - data plus modulated tones at 4.8 and 9.6 kHz

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

258.775

USA-155 (SDS-3 F2)

2000-80A
26633
(90043 in classfd.tle)

US intelligence-related satellite near 10° west longitude, possibly including communications

AM - 4.8 kHz data tone

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

258.800

USA-198 (SDS-3 F5)

2007-60A
32378

US mult--tasking intelligence-gathering and communications satellite

Data transmission (possibly in test mode)

Transmissions from a secondary payload on US classified satellite in HEO

Switched on and off near 44 degrees north latitude to provide eight hours near-continuous transmission

Also transmits at 251.275 MHz and 2242.5 MHz

259.700

STS Space Shuttle

ISS Crew/ payload transport

AM voice

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 transmits at 2217.500 MHz

262.913

Gonets D1-1

1996-9A
23787

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 49s after each minute with activity increasing over eastern Europe

Used 264.750 MHz in the past

Identified by Ivan Artner 2005 Oct/Nov

262.913

Gonets D1-7

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 42s after each minute with activity increasing over eastern Europe

Identified by Ivan Artner 2005 Oct/Nov

263.090

Gonets D1-4

1997-6D
24728

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 5s after each minute with activity increasing over eastern Europe

Identified by Ivan Artner 2005 Oct/Nov

263.225

Unknown (SDS-2?)

US intelligence-related satellite near 140° west longitude, possibly including communications

AM - high speed (19.2 kb/s?) data transmission

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

1997-6E
24729

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 39s after each minute with activity increasing over eastern Europe

Identified by Ivan Artner 2005 Oct/Nov

264.600

Gonets D1-3

1996-9C
23789

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 27s after each minute with activity increasing over eastern Europe

No longer active? - see 265.1375 MHz

264.750

Cosmos 2386 (Gonets D1-8)

2001-58C
27057

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 20s after each minute with activity increasing over eastern Europe - catalogued by NORAD as Cosmos 2386 but transmissions suggest that it is Gonets D1-8

Identified by Ivan Artner 2005 Oct/Nov

264.750

Gonets D1-1

1996-9A
23787

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 15s after each minute then silence

Extended transmitter activity when over eastern Europe

No longer active

See 262.9125 MHz

264.788

Gonets D1-9

2001-58F
27060

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 9s after each minute with activity increasing over eastern Europe

Identified by Ivan Artner 2005 Oct/Nov

264.900

Gonets D1-2

1996-9B
23788

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted at one minute intervals and then silence

Extended transmitter activity when over eastern Europe

Trigger at 33s after the minute (2002 July)

No longer active - see 265.0625 MHz

264.900

Gonets D1-6

1997-6F
24730

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 58s after each minute with activity increasing over eastern Europe

Discovered by Paul Marsh and Ivan Artner 2005 Oct/Nov

265.063

Gonets D1-2

1996-9B
23788

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 11s after each minute with activity increasing over eastern Europe

Used 264.750 MHz in the past

Identified by Ivan Artner 2005 Oct/Nov

265.138

Gonets D1-3

1996-9C
23789

Store-dump communications (Russian)

AM data sidebands (2.7, 5.4 and 8.1 kHz) transmitted in sub-second bursts

Trigger pulse transmitted 25s after each minute with activity increasing over eastern Europe

Used 264.600 MHz in the past

Identified by Ivan Artner 2005 Oct/Nov

267.550

Unknown (SDS-2?)

US intelligence-related satellite near 140° west longitude, possibly including communications

AM - 4.8 kHz data tone

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 (SDS-3 F2)

2000-80A
26633
(90043 in classfd.tle)

US intelligence-related satellite near 10° west longitude, possibly including communications

AM - 4.8 kHz data tone

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

399.760

Cosmos 2341

1997-17A
24772

Navigation

CW - Doppler tracking beacon

Coherent transmission at 149.910 MHz

399.840

Cosmos 2366

1999-45A
25892

Navigation

CW - Doppler tracking beacon

Coherent transmission at 149.940 MHz

399.920

Cosmos 2336

1996-71A
24677

Navigation

CW - Doppler tracking beacon

Coherent transmission at 149.970 MHz

399.944

Oscar 29 (Transit)

1987-80B
18362

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

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 (Transit)

1988-74B
19420

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

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 23 (Transit)

1988-33A
19070

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

Operational frequency

Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one)

399.968

Oscar 25 (Transit)

1988-74A
19419

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

Operational frequency

Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one)

399.968

Oscar 27 (Transit)

1987-80A
18361

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

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 32 (Transit)

1988-33B
19071

Ionospheric modelling for US military (NIMS)

Modulated CW carrier

Operational frequency

Coherent transmission at 149.988 MHz (known to change between this frequency and the maintenance one)

400.000

Tsikada and Nadezhda

Navigation - plus Search and Rescue monitoring

CW - Doppler tracking beacon

Coherent transmission at 150.000 MHz
no longer active (see 150 MHz note)

400.032

ARGOS

1999-8A
25634

USAF space experiments

CW - Doppler tracking beacon

Coherent transmission at 150.012 MHz

Ceased to transmit 2003

400.032

Geosat

1985-21A
15595

Oceanography - wave height measurement

CW - Doppler tracking beacon

Coherent transmission at 150.012 MHz

400.032

GFO

1998-7A
25157

Oceanography - wave height measurement

CW - Doppler tracking beacon

Geosat Follow On

Coherent transmission at 150.012 MHz and also transmits at 2207.5 MHz

400.032

PicoSat 9

2001-43B
26930

USAF Space Test Program (STEP)

CW - Doppler tracking beacon

Detected being switched on and off over Europe, not continuously active

Coherent transmission at 150.012 MHz

Ceased to transmit late-2004

400.032

RADCAL

1993-41A
22698

Radar calibration

CW - Doppler tracking beacon

Radar Calibration satellite

Coherent transmission at 150.012 MHz, operation is intermittent

400.032

USA-147 (DMSP F-15)

1999-67A
25991

RADCAL secondary payload aboard US military metsat

CW - Doppler tracking beacon

Defense Meteorological Satellite Program - also transmits at 2237.5 MHz (information contributed by the late Ivan Artner), 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

400.080

Cosmos 2361

1998-76A
25590

Navigation

CW - Doppler tracking beacon

Non operational but still transmitting 2000 December 13

Coherent transmission at 150.030 MHz

400.080

Cosmos 2373

2000-58A

Navigation

CW - Doppler tracking beacon

Coherent transmission at 150.030 MHz

400.100

Orbcomm

Mobile telephony

CW - Doppler tracking beacon

Several satellites

Also transmitting digitised telephony signals at various frequencies 137-138 MHz (see individual entries)

400.450

Akebono (EXOS-D)

1989-16A
19822

Studies of Magnetosphere and Ionosphere - Japan

CW modulated

Carrier with data modulation - appears as a tone modulated by a buzz

400.550

Resurs O1-4

1998-43A
25394

Remote sensing

CW Spread Spectrum

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

2000-75C
26621

Auroral research - Sweden

AM - modem-type databursts

Telemetry but silent since 2001 Feb 12 (shortly after launch) probably due to onboard computer failure
no longer active

400.800

Cosmos 2373

2000-58A

'Yantar/Cometa' recoverable satellite - photographic mapping

CW - Doppler tracking beacon

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

2005-34A
28841

Yantar/Cometa' recoverable satellite - wide-area photographic reconnaissance

CW - Doppler tracking beacon

Coherent transmission at 150.300 MHz

Cameras and film recovered after mission running between 2005 September 2 and 2005 October 14?
no longer active

479.865

Jiang Bing 3A (Zi-Yuan 2)

2000-50A
26481

Remote sensing

CW - Doppler tracking beacon

Coherent transmission at at 179.951 MHz

480.017

Fengyun 1D

2002-24A
27431

Meteorological Imaging

CW - Doppler tracking beacon

Coherent transmission at 180.007 MHz

480.019

Fengyun 1C

1999-25A
25730

Remote sensing

CW - Doppler tracking beacon

Active transmitter until 2007 February when attacked in ground-based interceptor test

Coherent transmission at 180.007 MHz

480.025

CBERS 1 (Zi-Yuan 1)

1999-57A
25940

Remote sensing

CW - Doppler tracking beacon

China Brasil Earth Resources Satellite

Coherent transmission at 180.011 MHz - silent since mid-2003

480.033

CBERS 2B

2007-42A
32063

Remote sensing

CW - Doppler tracking beacon

China Brazil Earth Resources Satellite

Coherent transmission at 180.013 MHz

480.037

CBERS 2A

2003-49A
28057

Remote sensing

CW - Doppler tracking beacon

China Brazil Earth Resources Satellite

Coherent transmission at 180.014 MHz

628.000

ISS (Zvezda)

1998-67A
25544

ISS module

FM telemetry - sidebands at +/- 128 kHz

Transmits on command from within Russia - 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 (Zvezda)

1998-67A
25544

ISS module

FM telemetry - sidebands at +/- 128 kHz

Transmits on command from within Russia - 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 (Zarya)

1998-67A
25544

ISS module

FM telemetry - sidebands at +/- 128 kHz

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

634.000

ISS (Zarya)

1998-67A
25544

ISS module

FM telemetry - sidebands at +/- 128 kHz

Transmissions originally reported by Sven Grahn when Zarya first reached orbit

Transmits on command from Moscow, 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

922.763

Progress

ISS logistics

CW

Part of the REGUL command and control system - there may be other elements of signal on sidebands around this frequency

Active during the approach and departure phases from the ISS and occasionally during checks while docked

Also transmits at 121.75 MHz and 166 MHz

922.763

Soyuz

ISS crew transport

CW

Part of the REGUL command and control system - there may be other elements of signals on sidebands around this frequency - transmits during the approach and departure phases from the ISS and occasionally during checks while docked

Also transmits at 121.75 MHz and 166 MHz

2202.000

Beidou 1M

Navigation satellite

Carrier plus multiple sidebands

Probably no longer transmitting

2202.447

Sicral 1

2001-5A
26694

Geosynchronous comsat at 16deg east longitude

CW carrier plus sub-carriers at 293kHz and 297 kHz

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2202.500

USA-32

1988-78A
19460

Electronic Intelligence Gathering similar to USA-81

CW carrier plus side-bands

Reported frequency - definite transmission at 2282.503 MHz

2202.530

USA-81

1992-23A
21949

Electronic Intelligence Gathering similar to USA-32

CW carrier plus side-bands

(frequency information contributed by the late Ivan Artner)

2205.328

Telecom 2D

1996-44B
24209

Geosynchronous comsat at 8deg west longitude

CW carrier plus side-bands

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2207.130

Telecom 2C

1995-76A
23730

Geosynchronous comsat at 3deg east longitude

CW carrier plus side-bands

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2207.487

GFO

1998-7A
25157

Oceanography - wave height measurement

CW carrier plus side-bands

Geosat Follow On

Also transmits at 150.012 MHz and 400.032 MHz(frequency information contributed by the late Ivan Artner)

2207.500

AMS 2

1977-44A
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)

2217.500

STS Space Shuttle

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

2222.473

DMSP F-16

2003-48A
28054

Military meteorological satellite - unspecified secondary payloads

Sweeping CW carrier plus side-bands

Defense Meteorological Satellite Program

Also transmits at 2242.473 MHz, 2236.5 MHz and 2248.415 MHz

2222.500

DMSP F-17

2006-50A
29522

Military meteorological satellite - unspecified secondary payloads

CW carrier plus side-bands

Defense Meteorological Satellite Program

Also transmits at 2237.5 MHz and 2249.415 MHz
(frequency information contributed by the late Ivan Artner)

2222.500

NOSS 3-2

2003-54A
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

NOSS 3-3

2005-4A
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-133 (Lacrosse 3)

1997-64A
25017

Military radar reconnaissance satellite

CW carrier plus side-bands

(frequency information contributed by the late Ivan Artner)

2222.502

USA-69 (Lacrosse 2)

1991-17A
21147

Military radar reconnaissance satellite

CW carrier plus side-bands

(frequency information contributed by the late Ivan Artner)

2222.528

Coriolis

2003-1A
27640

Oceanographic and geomagnetic studies

CW carrier plus side-bands

(frequency information contributed by the late Ivan Artner)

2227.476

NATO 4B

1993-76A
22921

Geosynchronous comsat at 35deg east longitude

CW carrier plus side-bands

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2227.481

NATO 4A

1991-1A
21047

Miltary geosynchronous comsat at 18deg west longitude

PSK with sub-carrier, 1024 kHz

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2227.487

Skynet 4C

1990-79A
20776

Miltary geosynchronous comsat at 1deg west longitude

CW carrier plus side-bands

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2227.497

Skynet 4E

1999-9B
25639

Miltary geosynchronous comsat at 53deg east longitude

CW carrier plus side-bands

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2227.508

Skynet 4D

1998-2A
25134

Miltary geosynchronous comsat at 34deg west longitude

CW carrier plus side-bands

Geosynchronous orbit
(frequency information contributed by the late Ivan Artner)

2227.514

Skynet 4F

2001-5B
26695

UK miltary and government comsat at 6deg east longitude

CW carrier plus side-bands

Geosynchronous orbit

2232.495

Unknown

90016 (classfd.tle)

Multi-tasking military satellite at 13deg west longitude?

CW carrier plus side-bands

geosynchonous orbit
(frequency information contributed by the late Ivan Artner)

2232.496

Unknown

90056 (classfd.tle)

Multi-tasking military satellite at 41deg west longitude?

CW carrier plus side-bands

geosynchonous orbit
(frequency information contributed by the late Ivan Artner)

2232.497

DSP F-21

2001-33A
26880

Geosynchronous missile early warning at 70deg 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

DSP F-20

2000-24A
26356

Geosynchronous missile early warning at 8.5deg east longitude

FM wide-bandwidth data

Defense Support Program also transmits at 2237.5 MHz
(frequency information contributed by the late Ivan Artner)

2232.500

NOSS 3-3

2005-4A
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)

2232.500

NOSS 3-2

2003-54A
28095

Navy Ocean Surveillance System SIGINT

CW carrier plus side-bands

Also transmits at 2222.5 MHz(frequency information contributed by the late Ivan Artner)

2232.511

DSP F-16

1991-80B
21805

Geosynchronous missile early warning at 38deg 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

2006-27A
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

2007-51A
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

DSP F-20

2000-24A
26356

Geosynchronous missile early warning at 8.5deg 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

DSP F-19

1999-17A
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

DSP F-16

1991-80B
21805

Geosynchronous missile early warning at 38deg 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

DSP F-21

2001-33A
26880

Geosynchronous missile early warning at 70deg 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

1977-44A
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-147 (DMSP F-15)

1999-67A
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 (information contributed by the late Ivan Artner), 150.012 MHz and 400.032 MHz

2237.500

DMSP F-16

2003-48A
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
(frequency information contributed by the late Ivan Artner)

2237.500

DMSP F-17

2006-50A
29522

Military meteorological satellite - unspecified secondary payloads

CW - wide sweeping carrier

Defense Meteorological Satellite Program

Also transmits at 2222.5 MHz and 2249.415 MHz
(frequency information contributed by the late Ivan Artner)

2237.518

DSP-F7

90067 (classfd.tle)

DSP - Missile early warning

CW carrier plus side-bands

Defunct satellite in geosynchronous 'graveyard' orbit
(frequency information contributed by the late Ivan Artner)

2242.473

DMSP F-16

2003-48A
28054

Military meteorological satellite - unspecified secondary payloads

CW carrier plus side-bands

Defense Meteorological Satellite Program

Also transmits at 2249.415 MHz and 2236.5 MHz
(frequency information contributed by the late Ivan Artner)

2242.482

USA-129

1996-72A
24680

US - military and intelligence

CW carrier plus side-bands

(frequency information contributed by the late Ivan Artner)

2242.482

USA-186

2005-42A
28888

US - military and intelligence

CW carrier plus side-bands

Possible transmission frequency
(frequency information contributed by the late Ivan Artner)

2242.486

USA-155 (SDS-3 F2)

2000-80A
26633
(90043 in classfd.tle)

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

2242.495

USA-67 (SDS 2 F2)

20963
1990-97B
90037 (classfd.tle)

Multi-tasking military satellite near 75° east longitude,

PSK with sub-carrier, 1024 kHz

Satellite Data System - the equatorial orbit has evolved to an inclination of 15°
Identified by Ivan Artner - a study by him in 2006 March showed that the S-band transmitter responds to eclipse periods by becoming intermittent while out of direct sunlight, indicating that the onboard batteries are not charging

2242.495

USA-137 (SDS-3 F1)

1998-5A
25148
90025 (classfd.tle)

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)

1996-38A
23945
90028 (classfd.tle)

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)

Formerly transmitted 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; late 2007 - USA-137 appears to be in the process of decommissioning

2242.500

Unknown (SDS-2?)

90020 (classfd.tle)

US mult--tasking intelligence-gathering and communications satellite

CW carrier, oscillates in frequency due to satellite spinning at 4.6s per rev

Highly eccentric orbit, possibly communications but non-operational, the signal oscillation is probably due to the originally de-spun aerial platform having matched rotation with the satellite body

2242.500

Unknown (SDS-2?)

US intelligence-related satellite near 140° west longitude, possibly including communications

CW carrier (plus side-bands?)

Reported frequency for satellite in geosynchronous orbit, exact frequency not known - also reported to transmit at 250.075 MHz, 256.475, 263.225 and 267.550 MHz

2242.500

Unknown

90026 (classfd.tle)

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

2242.503

USA-179 (SDS-3 F4)

2004-34A
28384
(90027 in classfd.tle)

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)

2007-60A
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 251.275 and 258.800 MHz

2242.515

Unknown (SDS-2?)

90004 (classfd.tle)

US mult--tasking intelligence-gathering and communications satellite

CW carrier, oscillates in frequency due to satellite spinning at 5.2s per rev

Highly eccentric orbit, possibly communications but non-operational, the signal oscillation is probably due to the originally de-spun aerial platform having matched rotation with the satellite body

2247.415

DMSP F-16

2003-48A
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

DMSP F-17

2006-50A
29522

Military meteorological satellite - unspecified secondary payloads

CW carrier plus side-bands

Defense Meteorological Satellite Program

Also transmits at 2222.5 MHz and 2237.5 MHz
(frequency information contributed by the late Ivan Artner)