Satellite Radio Frequencies - 136-138 MHz band

The frequency band between 136 and 138 MHz was, at one time, reserved for use in space research. Many early satellites had transmission frequencies in this band, and the frequencies above 137 MHz are still used occasionally by new satellites.

Because of history, transmissions from older satellites can still be found in the lower half (136-137) MHz of the band even though it has lost its reserved status.

This list is not particularly up to date - it was last significantly updated in 2014. A more-current list can be found at Mike Kenny's web site that shows only satellites confirmed as active in 2017.

Freq (MHz)	Satellite	Transmission	Notes
136.235	TIROS 10 1965-051A 1430	AM - 1.3 kHz tone	metsat: Payload now inactive, radio transmission is not continuous - (information contributed by Michael D Kenny)
136.260	ERS 20 1967-040D 2768	AM - tone (unstable)	USAF test satellite: High orbit, visible for long periods of time - (information contributed by Michael D Kenny)
136.410	Isis 1 1969-009A 3669	CW	Ionosphere studies: (information contributed by Michael D Kenny)
136.440	ERS 15 1966-077C 2412	AM with 1.3 kHz tone	Military satellite: Incorrectly catalogued by NORAD as SECOR 7 - (information contributed by Michael D Kenny)
136.500	Nimbus 4 1970-025A 4362	CW - sometimes modulated	metsat: Payload no longer operational - (information contributed by Michael D Kenny)
136.650	NNS O-2 1964-083D 965	CW Carrier plus telemetry tones	navsat LEO: Second operational TRANSIT navsat, navigation system failed soon after launch but transmitter is still active (information contributed by Michael D Kenny)
136.695	Shinsei 1971-080A 5485	CW	Japanese scientific satellite: Continuous transmission - (information contributed by Michael D Kenny)
136.770	NOAA 9 1984-123A 15427	CW	metsat: Telemetry frequency, transmission is intermittent - (information contributed by Michael D Kenny) - Also has a transmission at 137.500 MHz
136.800	Solrad 7B 1965-016D 1291	AM IRIG telemetry channels	Solar radiation studies (launched 1969): Continuous transmission - (information contributed by Michael D Kenny)
137.080	OPS 7898-2 1971-110C 5680	CW	US military satellite: (information contributed by Michael D Kenny)
137.100	NOAA 18 2005-018A 28654	APT at 4 lines per second - interlaced visible light and infrared images	metsat: Revised frequency as of 2006 Jan 4, changed from 137.9125 MHz
137.142	Eutelsat 1 F-4 1987-078B 18351	CW	comsat: Regular, intermittent signal possibly due to vehicle rotation causing periodic flow of power from solar panels
137.200	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies,individual satellites switch between them - Also transmits at 400.100 MHz
137.225	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies,individual satellites switch between them - Also transmits at 400.100 MHz
137.250	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies,individual satellites switch between them - Also transmits at 400.100 MHz
137.300	Russian Imaging	APT at 2 lines per second	Meteorological and remote sensing imaging: Frequency not currently active
137.350	NOAA 15 1998-030A 25338	CW Doppler Beacon and telemetry	metsat: Continuous transmission -(information contributed by Michael D Kenny) - Also transmits at 137.500 MHz
137.350	NOAA 16 2000-055A 26536	CW Doppler Beacon and telemetry	metsat: Continuous transmission -(information contributed by Michael D Kenny) - Also transmits at 137.500 MHz
137.350	Compass 2 2006-019A 29157	CW/AM	Russian scientific satellite studying possible ways of predicting earthquakes - not operating properly: After launch on 2006 May 26 - bursts of CW tone one to ten seconds duration in groups with peaks at central frequency and +/- 64 kHz - As of 2006 Nov 16 - data transmission at 64 kHz side bands only
137.380	OPS 7613-1 1969-082B 4256	Mixed modulation (PAM/FM/AM)	Navigation technology: (information contributed by Michael D Kenny)
137.400	Russian Imaging	APT at 2 lines per second	Meteorological and remote sensing imaging: Frequency not currently active
137.410	OPS 7613-6 1969-082E 4237	CW	USAF test satellite: (information contributed by Michael D Kenny)
137.440	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies, individual satellites switch between them - Also transmits at 400.100 MHz
137.460	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies, individual satellites switch between them - Also transmits at 400.100 MHz
137.500	TIROS-N 1978-096A 11060	CW - carrier only	metsat: Inactive satellite but reportedly transmitting
137.500	NOAA 6 1979-057A 11416	CW - carrier only	metsat: Inactive satellite but reportedly transmitting
137.500	NOAA 9 1984-123A 15427	Tone for 6 seconds out of every 25 seconds (periods vary - these are averages)	metsat: Non-operational satellite but transmitter still had power long after the payload was switched off - Timings shown are as of 2001 January 6 - Probably no longer transmitting at this frequency - Also has a transmission at 136.770 MHz
137.500	NOAA 12 1991-032A 21263	APT at 4 lines per second - interlaced visible light and infrared images	metsat: Switched off occasionally when transmissions conflict with those from NOAA 15 - Also transmits at 137.770 MHz - De-commissioned 2007 Aug 10
137.500	NOAA 15 1998-030A 25338	APT at 4 lines per second - interlaced visible light and infrared images	metsat: Switched off occasionally when transmissions conflict with those from NOAA 12 - Also transmits at 137.350 MHz
137.625	NOAA 14 1994-089A 23455	APT at 4 lines per second - interlaced visible light and infrared images	metsat: Switched off occasionally when transmissions conflict with those from NOAA 17 - Also transmits at 137.770 MHz - Decommissioned 2007 May 23
137.625	NOAA 17 2002-032A 27453	APT at 4 lines per second - interlaced visible light and infrared images	metsat: Switched off occasionally when transmissions conflict with those from NOAA 14
137.626	ISS 1998-067A 25544	-	Space station: First detected 2020 Mar 20 by Scott Tilley of Canada and confirmed by others at diffferent locations around the world. Frequency is allocated to Swarm Technologies for its SpaceBee LEO comsat constellation
137.663	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz
137.688	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz
137.713	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz
137.738	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz
137.770	NOAA 11 1988-089A 19531	CW Doppler Beacon and telemetry	metsat: Continuous transmission when operational - (information contributed by Michael D Kenny) - De-commissioned 2004 June 16
137.770	NOAA 12 1991-032A 21263	CW Doppler Beacon and telemetry	metsat: Also transmitted at 137.500 MHz - De-commissioned 2007 Aug 10
137.770	NOAA 14 1994-089A 23455	CW Doppler Beacon and telemetry	metsat: Also transmits at 137.625 MHz - Decommissioned 2007 May 23
137.770	NOAA 17 2002-032A 27453	CW Doppler Beacon and telemetry	metsat: Also transmits at 137.625 MHz
137.800	Orbcomm	Digital data - transmitted to/from mobile terminals	Mobile telephony: One of several frequencies - individual satellites switch between them - Also transmits at 400.100 MHz
137.850	Russian Imaging	APT at 2 lines per second	Meteorological and remote sensing imaging: Frequency not currently active
137.913	NOAA 18 2005-018A 28654	APT at 4 lines per second - interlaced visible light and infrared images	metsat: Frequency probably not active - changed to 137.100 MHz (2006 Jan 4?)