| 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 |
CW only |
approx. 60s roll fading |
|
| EGRS-13 |
3891 |
1969-37B |
136.800 |
Various |
74 | Note 3 |
| S69-4 (Poppy-6) | 4237 |
1969-82E |
137.41 |
CW only |
Note 8. |
|
| TIMATION-II |
4256 |
1969-82B |
137.383 |
FM/AM |
79 |
Note 6. |
| SHINSEI |
5485 |
1971-80A |
136.695 |
CW only |
Daylight only |
|
| NOSS (Poppy-7) |
5680 |
1971-110C |
137.08 |
CW only |
Note 9. | |
| TIROS-N |
11060 |
1978-98A |
137.77 |
CW |
on/off
unmodulated
carrier in daylight only |
|
| NOAA-9 |
15427 |
1984-123A |
137.505 |
CW |
Usually with 136.77 MHz and sometimes 137.77 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 | |
| MEGSAT-1 | 26546 |
2000-57B |
137.905 |
PCM/PM |
305 |
Intermittent 1200 bps telemetry |
| NOAA 17 |
27453 |
2002-32A |
137.77 137.50 |
PCM/PM AM/FM |
DSB APT Changed from 137.62 to 137.50 on 12 Oct 2010 Note. APT faultly |
|
| 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 - Frequency change 23/6/2009 from 137.10 |
|
| NOAA-19 |
33591 |
2009-5A |
137.77 137.10 |
PCM/PM AM/FM |
DSB APT - Frequency change 23/6/2009 from 137.9125 |
|
| 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 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 |
Sometimes has
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. Also called S69-2. |
| 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. Acquisition of Signal (AOS) time series (pdf) 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-7. 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.
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 99 seconds, off for 229 seconds, approximately, as spacecraft rotates solar panels periodically into sunlight. Next period of visibility in Melbourne, Australia is 2/5/2012 to 29/5/2012, 60° peak on 13/5/2012. |
| 16 |
The 136 and 137 MHz carriers
may come for all of the pass (25% of passes), some of the pass (25%) or
not at all (50%). Some passes coincide with other NOAAs on 137.5 MHz (currently NOAA-17), causing RFI when the NOAA-9 137.5 carrier is on. NOAA-9-2011-5-16-0718.JPG Last Heard: December 2011 |
| 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 kbps Metop LRPT format. Infrequently uses 137.90 MHz User LRPT Websites: Jakub, Paul |
| Spacecraft no longer heard but still monitored occasionally |
Frequency |
Last Heard |
| PROSPERO (1971 Paper, 1973 Paper ,1975 Paper) |
137.560 |
November
2003 |
