| Name |
Catalog Number |
COSPAR ID |
Frequency MHz |
Modulation
|
Notes |
| TRANSIT |
965 |
1964-83D |
136.653 |
FM/PM |
Note 1. |
| SOLRAD 7B |
1291 |
1965-16D |
136.80 |
FM/AM |
Note 2. |
| ALOUETTE 2 |
1804 |
1965-98A |
136.98 |
Carrier only |
Note 18 |
| ERS 15 | 2411 |
1966-77B |
136.44 |
Carrier only |
Note 4 |
| EGRS 7 |
2412 |
1966-77C |
136.80 |
Carrier only |
Note 4a |
| ERS 20 |
2768 |
1967-40D |
136.26 |
PM |
910 Hz, 4 sec period Note 5. |
| ISIS 1 |
3669 |
1969-9A |
136.41 |
Carrier only |
|
| S69-4 |
4237 |
1969-82E |
137.41 |
Carrier only |
Note 8. |
| TIMATION
II |
4256 |
1969-82B |
137.383 |
FM/AM |
Note 6. |
| SHINSEI |
5485 |
1971-80A |
136.695 |
Carrier only |
Daylight only |
| NOSS |
5680 |
1971-110C |
137.08 |
Carrier only |
Note 9. |
| NOAA 9 |
15427 |
1984-123A |
136.77 |
Carrier only |
Note 16. |
| ECS 4 |
18351 |
1987-78B |
137.139 |
PCM/FSK/PM |
Note 15 |
| ECS 5 |
19331 |
1988-63B |
137.142 |
Carrier only |
Note 15 |
| OXP-1 |
22491 |
1993-09C |
137.05 |
PCM/PSK |
Note 19 |
| NOAA 15 |
25338 |
1998-30A |
137.35 137.62 |
PCM/PM AM/FM |
DSB Note 10 APT Note 11 |
| NOAA 18 |
28654 |
2005-18A |
137.35 137.9125 |
PCM/PM AM/FM |
DSB APT |
| NOAA 19 |
33591 |
2009-05A |
137.77 137.10 |
PCM/PM AM/FM |
DSB APT |
| Meteor-M
N2 |
40069 |
2014-37A |
137.10 |
QPSK |
LRPT
72 kbps Note 17. |
SpaceBEE |
numerous |
numerous |
137.050 137.845 137.975 |
SS-FM LoRa |
155 spacecraft. Note 20 |
| ORBCOMM |
various |
various |
137.2000 137.2250 137.2500 137.2875 137.3150 137.4400 137.4600 137.6625 137.6875 137.7125 137.7375 137.8000 & 137.5600 |
SDPSK OQPSK |
4800 bps PCM
Subscriber Communicator
downlink. Note 12. 57.6 kbps, 16 slot TDMA, Spacecraft to GES downlink. Note 12a. |
| VLD2 |
- |
- |
136.975 |
D8PSK |
Non satellite emitter in area.
ICAO VHF Data Link Mode
2 |
| 1 |
Launched on 13 Dec 1964 as the
second operational TRANSIT spacecraft, it should be more
correctly called OSCAR -2, O-2 or NSS 30020. Unfortunately, the
navigation system failed within 2 weeks of launch. The telemetry
beacon can be CW
or
modulated depending on solar lighting conditions. The PAM data is 35
steps
with a repeat cycle of about 12.5 seconds. Each step has a duty cycle
of about 75% data value and 25% return to centre frequency value. These
steps vary a 5400 Hz centre frequency sub carrier oscillator, IRIG 10,
that then frequency modulates the RF carrier. Another SCO at 10.5 kHz,
IRIG 12, is
sometimes present. It has a pattern of five pulses with gaps, followed
by a longer gap at about a 1.5 Hz rate. A SSB receiver will resolve,
separately, the carrier as a single tone and each of the sidebands as
"musical" tones. |
| 2 |
The telemetry is a multiplex of
six IRIG-106 7.5%
bandwidth sub carrier oscillators, linearly added and
amplitude modulate the RF carrier. IRIG 3 (730 Hz centre frequency) and
IRIG 4 (960 Hz cf) vary in step over 3.6 second with 8 periods of 450
millisecond each. IRIG 5 (1300 Hz cf), IRIG 6 (1700 Hz cf) and IRIG 7
(2300 Hz cf) are all fixed at their lower deviation limit of 1202 Hz,
1572 Hz and 2127 Hz respectively. IRIG 8 (3000 Hz) drifts from the the
lower limit, 2775 Hz, to the upper limit, 3225 Hz, over time. |
| 4 |
Called SECOR 7 by Space-Track.
The
telemetry is random levels of about 8 seconds duration each, on a 1300
Hz centre frequency SCO that amplitude modulates the RF carrier. The RF
exhibits short term frequency instability. |
| 4a |
Called ERS-15 by Space-Track. |
| 5 |
ERS-20
aka OV5-3,
sounds like a "moan". OV5 series. Unstable carrier (± 100 Hz), amplitude modulated with 910 Hz tone with approx. 4.6 second period. It can be heard about an hour earlier every 2 days for up to 12 hours over a 3 to 4 week period with a repeat cycle of about 7 weeks. An updated TLE was derived by Greg Roberts and Mike McCants in September 2007 |
| 6 |
Called OPS 7613 P/L 1 by
Space-Track.
Telemetry is PAM/FM/AM. 4 SCOs (Ch 4 960 Hz,Ch 6 1700 Hz, Ch 7 2300 Hz
and
Ch 8
3000 Hz centre frequencies). PAM is 30 levels plus a min and max
calibration/sync pulses over 4 secs. Ch 4 floating, Ch 6 & 7 are
repeating
patterns, Ch 8 is a 4 Hz clock. |
| 8 |
POPPY program declassified 12
Sept 2005 by NRO.
Preliminarily called POPPY-6B,
also known as OPS 7613 P/L 4 or NRL
PL162. Historically but incorrectly called S69-4 |
| 9 |
POPPY program declassified 12 sept 2005 by NRO. Preliminarily called POPPY-7B. also known as OPS 7898 P/L 2, previously thought to be US Navy Ocean Surveillance System (NOSS), Sub-Satellite Unit C (SSU-C). |
| 10 |
DSB -
Direct Sounder Broadcast - 8320 bps TIROS Information Processor (TIP)
data, Bi-phase-level encoded (Manchester), ±67°
PM
modulation, 1W, RHCP. 104, 8-bit words/minor frame. 20 bit sync code (EDE20 hex) + 4 bit S/C ID. |
| 11 |
APT -
Automatic Picture Transmission - 120 line/min Visible and Infrared
video (1600 Hz BW) amplitude
modulates a 2400 Hz carrier that then frequency modulates the 5W RF
carrier, deviation is ±17 kHz. RHCP, ˝ turn, ˝
wavelength resonant quadrifilar antenna (boom deployed VRA on TIROS-N
series spacecraft) |
| 12 |
ORBCOMM spacecraft are frequency
agile and may, can and do vary their downlink
frequency on a orbit by orbit basis. (TLEs) 59 spacecraft have been launched. These are Flight Model 1 to 28, 30 to 36 (now called OG1 models) of which only FM 4, 31, 32 and 36 are still active. FM 29 was Concept Demonstration Satellite 3 and FM 37 to FM 41 were Quick Launch 1 to 5. All have failed. FM 101 OG2 model, launched 8 Oct 2012, decayed 10 Oct 2012 FM 103, 104, 106, 107, 109 & 111 OG2 model launched 14 July 2014 FM 105, FM 108, FM 110, FM 112, FM 113, FM 114, FM 115, FM 116, FM 117, FM 118 & FM 119 OG2 model launched 22 December 2015. FM 104, 105 106, 111, 115 and 119 are not active. |
| 12a |
A Gateway Earth Station (NCC ID
120 (78 hex)) opened
early 2007 at Rutherglen, Australia, about 250 km North of my location.
Multiple 125 msec bursts, 1 sec apart, on 137.56 MHz. Photo GoogleEarth Placemark |
| 15 |
ECS-4
(EUTELSAT
1F4) re-orbited
above geostationary orbit December 2002 and drifting westward at
approximately 5° per day. ECS-4 Telemetry is 160 bps NRZ TDM PCM data, Bi-Phase-Level coded, BPSK on 2560 Hz subcarrier, PM on 137.14 MHz at 8 Watts. ECS-5 (EUTELSAT 1F5) re-orbited above geostationary orbit May 2000 and drifting westward at approximately 7.5° per day, ECS-5 Telemetry is 160 bps NRZ TDM PCM data, Bi-Phase-Level coded, BPSK on 2560 Hz subcarrier, PM on 137.14 MHz at 8 Watts. August 2020 - Carrier duty cycle - 1 minute on, 7 minutes off approx. PCM subcarrier intermittent. |
| 16 |
136.77 MHz is an erratic carrier. 137.505 MHz not heard since December 2014. |
| 17 |
Meteor-M2
Rate ˝, k = 7 Convolution coded, I = G1, Q = G2, Power I:Q = 1:1, 144 kilosymbols per second. CCSDS Format. SCID 00, VCID 05 with 3 out of APIDs 64 to 69, (MSU-MR channels 1 to 6) or VCID 63, Fill 29 September 2020, LRPT on 137.10 MHz, 72 kbps QPSK, 2 vis + 1 IR channels, APIDs 64, 65 & 68 Check status at http://happysat.nl/Meteor/html/Meteor_Status.html |
| 17a |
Meteor-M2-2
Rate ˝, k = 7 Convolution coded, I = G1, Q = G2, Power I:Q = 1:1, 144 kilosymbols per second. 72 kbps mode or 80 kbps Metop LRPT mode with Unique Word (UW) Insertion CCSDS Format. SCID 00, VCID 05 with 3 out of APIDs 64 to 69, (MSU-MR channels 1 to 6) or VCID 63, Fill As of December 2019 LRPT on 137.90 MHz, 72 kbps OQPSK mode, 2 vis + 1 IR channels, APIDs 64, 65 & 68 18 December 2019 - Not working, reportedly hit by a meteorite and damaged beyond repair. 22 January 2020 - Limited service restored but LRPT off permanetly |
| 18 |
Alouette-2 on 136.59 MHz re-discovered
by Raydel of Cuba in early August 2013. Subsequently found to be transmitting on 136.08 and 136.98 MHz as well. 136.08 MHz was a Wideband FM system for Sounder data with two sub-carriers, 22 and 30 kHz, FM/FM, 4W, 100 kHz bandwidth, 136.59 MHz was a Narrowband PM system for Experiment Data on 4 sub-carriers,3.9, 5.4. 14.5 & 22 kHz, PAM/FM/PM, 2 W, 50 kHz bandwidth and 136.98 MHz was a 100 mW CW tracking beacon Currently, only 136.98 MHz CW is on |
| 19 |
An unknown emitter on 137.05
MHz,
initially reported by Raydel,
has been
identified by experts on the Hearsat list as OXP-1 that was launched
in 1993. The search found that the
closest match was for the Pegasus R/B but a comparison of RCS suggests
the “correct assignments are
22491 for OXP-1 and 22489 for the Pegasus R/B stage. OXP-1 carried an
experimental payload to determine global
VHF frequency utilization prior to the launch of the ORBCOMM
constellation
satellites and measured user density, power levels and interference
world-wide in the 148.00 MHz-150.05 MHz band. 1200 bps HDLC-like format. 9 sec bursts, 33 sec apart. Not active on every sunlit pass nor when in eclipse. Last heard - June 2022 |
| 20 |
Long Range (LoRa)
spread-spectrum frequency
modulation. Semtech
proprietary phyical layer protocol. Speading Factor = 7 or 8, Bandwidth = 41.7 kHz. Implict Header used to indicate variable PacketLength (15 to 255 bytes), Code Rate (4/8) and CRC present. |
| Spacecraft no longer
heard but
still monitored occasionally |
Frequency |
Last
Heard |
| PROSPERO
(1971 Paper,
1973 Paper
,1975 Paper) |
137.56 |
Nov
2003 |
| MEGSAT-1
2000-57B/26546 1200 bps PCM/PM telemetry
|
137.905 |
Dec
2011 |
| TIROS-N 11060 1978-98A | 137.77 | Dec 2015 |
| TIROS-10
1430 1965-51A
1280 Hz. |
136.232 | Aug
2017 |
| HAMSAT
28650 2005-17B Hamsat not heard since December 2014, heard again from 19 September 2017 to Jan 2018, heard again 27 Jan 2020, 2 Feb 2020. 256 bps on ± 25.6 kHz subcarrier sidebands & ±51.2 kHz unmodulated sidebands |
137.20 | 23
Feb 2020 |
| EGRS 13 3891 1969-37B 136.80 Carrier only Note 3 Previously had IRIG 3 SCO, 730 Hz c.f., 16 segment, 0.67s per segment, PAM/FM/PM telemetry or just 680 Hz or CW EGRS (Electronic & Geodetic Ranging Satellite or Experimental Geodetic Research Satellite) with a SECOR (Sequential Collation of Range) transponder. | 137.80 |
Jan
2019 |
| Meteor-M N2-2 44387 2019-38A 137.90 OQPSK LRPT 72 kbps Note 17a | 137.90 | 18 Dec 2019 |
