| Name |
Catalog Number |
COSPAR
ID |
Frequency MHz |
Modulation
|
Audio (kB) |
Notes |
| TRANSIT
|
965 |
1964-83D |
136.653 |
FM/PM |
118 |
Note 1. |
| SOLRAD 7B |
1291 |
1965-16D |
136.80 |
FM/AM |
157 |
Note 2. |
| TIROS-10 |
1430 |
1965-51A |
136.232 |
PM |
approx
1280 Hz. Intermittent operation. |
|
| ERS 15 | 2411 |
1966-77B |
136.44 |
PM | 466 |
1200-1300 Hz, approx. 8 sec
period
Note 4 |
| ERS 20 |
2768 |
1967-40D |
136.26 |
PM |
156 |
910 Hz, 4 sec period Note 5. |
| ISIS 1 |
3669 |
1969-9A |
136.41 |
Carrier only |
||
| EGRS-13 |
3891 |
1969-37B |
136.800 |
Carrier only |
74 | Note 3 |
| S69-4 |
4237 |
1969-82E |
137.41 |
Carrier only |
Note 8. |
|
| TIMATION-II |
4256 |
1969-82B |
137.383 |
FM/AM |
79 |
Note 6. |
| SHINSEI |
5485 |
1971-80A |
136.695 |
Carrier only |
Daylight only |
|
| NOSS |
5680 |
1971-110C |
137.08 |
Carrier only |
Note 9. | |
| TIROS-N |
11060 |
1978-98A |
137.77 |
Carrier only |
on/off
unmodulated
carrier in daylight only |
|
| NOAA-9 |
15427 |
1984-123A |
137.505 |
Carrier only |
Usually with 136.77 MHz. Note 16. | |
| ECS-4 |
18351 |
1987-78B |
137.141 |
PCM/FSK/PM |
78 |
Note 15 |
| NOAA 15 |
25338 |
1998-30A |
137.35 137.62 |
PCM/PM AM/FM |
DSB Note 10 APT Note 11 |
|
| NOAA 16 |
26536 |
2000-55A |
137.77 |
PCM/PM |
DSB not always on, APT failed November, 2000 | |
| HAMSAT |
28650 |
2005-17B |
137.20 |
PCM/PSK/PM |
84 |
256 bps on ± 25.6 kHz subcarrier sidebands & ±51.2 kHz unmodulated sidebands |
| NOAA-18 |
28654 |
2005-18A |
137.35 137.9125 |
PCM/PM AM/FM |
DSB APT |
|
| NOAA-19 |
33591 |
2009-5A |
137.77 137.10 |
PCM/PM AM/FM |
DSB APT |
|
| Meteor-M
N1 |
35865 |
2009-49A |
137.100 |
QPSK |
282 |
LRPT
72 kbps or 80 kbps Note 17. |
| ORBCOMM |
various |
various |
137.2000 137.2250 137.2500 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. 41 spacecraft have been launched. These are Flight Model 1 to 41, FM 29 is Concept Demonstration Satellite 3 and FM 37 to FM 41 are Quick Launch 1 to 5. FM 1, 2, 3, 17, 26, 28 & 33 are not transmitting. FM 29 (CDS-3) and FM 37 to FM 41 (Quick Launch 1 to 5) have all failed, also here and here 57.6 kbps, 16 slot TDMA, Spacecraft to GES downlink. Note 12a. |
| 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. Also see Maik Hermenau's TRANSIT 5B5 page |
| 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. |
| 3 |
Previously had IRIG 3 SCO, 730
Hz
c.f., 16 segment, .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. |
| 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. |
| 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. 3 SCOs (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 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). TLEs from Mike McCants' classified section. |
| 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, ½ turn, ½
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. |
| 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, now drifting westward at
approximately 5° per day. Telemetry is 160 bps NRZ TDM PCM data, Bi-Phase-L coded, BPSK on 2560 Hz subcarrier, PM on 137.1420 MHz at 8 Watts. On for 263 seconds, off for 527 seconds, approximately, as spacecraft rotates solar panels periodically into sunlight. Next period of visibility in Melbourne, Australia is 16/5/2013 to 11/6/2013, 60° peak on 27/5/2013 |
| 16 |
The 136 and 137 MHz carriers are
on for about 25% of a sunlt pass. NOAA-9-2011-5-16-0718.JPG Off between December 2011and July 2013 |
| 17 |
Rate ½, k = 7 Convolution
coded,
I = G1, Q = G2, Power I:Q = 1:1, Symbol Rate 72 kilosymbols per second CCSDS Format. SCID 00, VCID 05, 3 out of APIDs 64 to 69, (MSU-MR channels 1 to 6) & 70 (calibration or telemetry). 8 bit data, default jpeg Huffman table Sometimes, switches to 80 ksps Metop LRPT format. Infrequently uses 137.90 MHz User LRPT Websites: Jakub, Paul Recent activity: 04 May 20212 LRPT off 00 Nov 2012 LRPT resumed on 137.90 Mhz and UW 80 kbps LRPT mode 06 Dec 2012 LRPT changes to 72 kbps mode 20 Jan 2013 LRPT 137.9 MHz 72k in fill mode 11 Feb 2013 LRPT restored on 137.1 MHz 72k mode 20 Feb 2013 LRPT 137.1 MHz 72k mode sending 'fill' packet 22 Mar 2013 LRPT 137.1 MHZ 72k mode but APIDs 64 to 69 not being used |
| Spacecraft no longer
heard but
still monitored occasionally |
Frequency |
Last Heard |
| PROSPERO
(1971 Paper, 1973 Paper
,1975 Paper) |
137.560 |
November
2003 |
| MEGSAT-1
2000-57B/26546 Intermittent 1200 bps PCM/PM telemetry Audio file 305 |
137.905 |
December
2011 |
