UHF-Satcom.com - L-Band monitoring (16/05/2009 22:05:34 +0100)
Don't forget - if you want to chat about L-Band reception, pop along to the
#hearsat IRC channel, details here
L-Band downlinks mostly consist of traffic which is delivered to mobile users
- there are exceptions to this of course. At L-band you can hear Inmarsat
digital telephony / data, Weather Fax, Iridium telephony, and many streams of
telemetry type traffic. There is about a 50/50 split in the traffic as to its
origin, with some coming from Geostationary satellites, other traffic from
orbiting satellites. One particularly interesting set of LEO L-Band
satellites are those that form the COSPAS-SARSAT search and rescue satellite
radiolocation system, a separate page dedicated to this is
here. Work has been progressing on an
Inmarsat pager obtained from eBay, you can read about that here.
In order to successfully receive L-band signals, you will need a
good preamplifier - the 13cm/23cm
VK5EME preamp
is recommended for this as it provides a low noise figure and high associated
gain. Coupled with the preamp, a suitable antenna must also be used. For feeding
either an offset or prime focus dish, a 3.5 turn helical can be used (details
below). Few L-band downlinks are linearly polarised, the exception is Meteosat
at 0W which uses horizontal polarisation. The frequency range to define L-band
as far as satellite downlinks go, can be from 1.3GHz to 1.7GHz. For Inmarsat-C
it is possible to use an amplified / filtered patch antenna such as the one
available here.
|
 |
The picture to the left shows an assembled
VK5EME dual
stage LNA board. N sockets are used as they are low-loss at 1.5GHz. This
particular LNA is suitable for Inmarsat Reception due to its low noise and
high associated gain.
The custom milled enclosure was chosen mainly for mechanical rigidity
reasons.
The picture to the left shows a new version of the LNA which is boxes and ready to
go as a plug and play solution to L-Band reception. The LNA has been
checked for any self oscillations caused by being mounted in the box, and
none were found. In fact the performance has been excellent.
|
|
A simple LHCP helical antenna centred on 1550MHz is
described to the right - this antenna can be used with prime focus or
offset dishes. This antenna is ideal for Inmarsat reception when combined
with a 60cm to 90cm dish and suitable LNA board such as the one mentioned
above.
The dimensions are not overly critical, but should be
within a couple of mm of those quoted. The ground plane can be made from
PCB or aluminium, and its recommended that an SMA or N-Type connector is
used. The helix element can be made of 1.5mm or 2mm wire - the prototype
used 2mm silver plated copper wire. The helix element can be made self
supporting, but its better practice to make a supporting rod from nylon or
plastic. The first quarter turn of the helical should be bent to be
parallel with the ground plane, leave a 1mm gap here. |
 |
Work is progressing well on the
Inmarsat B-Gan system which allows IP LAN extensions over satellite - this is
using an eBay sourced B-Gan modem which has been placed in promiscuous mode. In
addition to B-Gan, Std-B, Mini-M,
Std-C and Std-D+ are work in progress. Std-C is based
on a Thrane & Thrane TT3022C terminal, with demodulator data tapped out and
parsed with custom PC software, details to follow. The Inmarsat L-Band
transponder spectrum plots for 15.5W can be found here.
Inmarsat-C channels are analysed with the Inmarsat-C demo decoder available at
InmarsatDecoder.com
- no message content except broadcast messages like SafetyNet / EGC's are shown
in the demo, but CES capabilities, frequency info etc is shown as per the
screenshots below;
 |
 |
L-Band Geostationary satellite survey
contributions from #hearsat (xBr, pjm, kodar, gonzo, hfid, blh, Freq, r00t, trango)
Position Freq Service / Modulation / Notes
98.14W 1525.870 BGAN 33.6 40kHz ACF=80.2ms
Inmarsat 4F3 1528.785 LES 360 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
(tnx to blh,) 1528.805 LES 360 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
(trango and) 1530.953 6Kbps BPSK weak
(r00t) 1531.240 BGAN ~100kHz weak
1531.710 LES 056 Local=2 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1531.750 LES 253 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1531.770 LES 254 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1531.790 LES 252 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1531.810 LES 054 Local=3 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1532.080 BGAN ~100kHz weak
1533.215 LES 361 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1533.285 LES 361 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1533.615 6Kbps BPSK? weak
1533.625 Std-B NCS
1533.635 Std-M LES 0xBD
1535.1375 Seastar DGPS point to multipoint BPSK 2438bps {id=0xC685 scr=0x5C08}
1535.175 Veripos DGPS correction data BPSK 2438bps (High Power) {id=???? scr=0x1D2F}
1536.900 BGAN ~160khz
1537.0625 BGAN 8400bps QPSK
1540.300 BGAN ~160khz
1542.500 BGAN ~160khz
1542.700 BGAN ~160khz
1543.140 LES 252 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.160 LES 253 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.180 LES 054 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.185 BPSK 2498Bd 2240bit frame
1543.205 LES 051 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.250 LES 056 Local=0 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.290 2400bps BPSK BURSTS
1543.305 LES 053 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.310 3372bps QPSK - Inmarsat AMSC LES
1543.350 LES 254 Local=3 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.379 2400Bpsk BURSTS
1543.380 LES 052 Local=2 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.395 LES 054 Local=1 Joint NCS+TDM - private LES TDMA BPSK 1200bps
1543.955 BPSK 2498Bd 2240bit frame
1545.545 SkyFire DGPS 1200BPSK
1546.840 3372bps QPSK - Inmarsat AMSC LES
1546.840 3372bps QPSK - Inmarsat AMSC LES
1547.5475 4800bps BPSK
1547.625 3600bps QPSK - Inmarsat AMSC traffic channel ?
1547.630 1800bps QPSK?? on-demand channel
1547.715 3372bps QPSK - Inmarsat AMSC LES
1547.840 3372bps QPSK - Inmarsat AMSC LES
1547.966 3600bps QPSK on demand channel
1550.150 3600bps QPSK on demand channel
1552.277 3372bps QPSK - Inmarsat AMSC LES
1552.532 3372bps QPSK - Inmarsat AMSC LES
1553.071 3372bps QPSK - Inmarsat AMSC LES
1557.465 3600bps GMSK
1557.570 6000bps BPSK weak
1557.605 3372bps QPSK - Inmarsat AMSC LES
1557.6175 3372bps QPSK - Inmarsat AMSC LES
1557.6295 3372bps QPSK - Inmarsat AMSC LES
1557.6415 3372bps QPSK - Inmarsat AMSC LES
1557.6535 3372bps QPSK - Inmarsat AMSC LES
1557.8345 2400bps BPSK weak
1557.8545 P2MP 2438.1Bd Fugro SeaStar {id=0xC685 scr=0x5C08}
1558.0045 3600GMSK
1558.0145 3600GMSK
1558.0245 3600GMSK
1558.0345 3600GMSK
1558.101 3600QPSK - Inmarsat AMSC traffic channel ?
1558.113 3600QPSK - Inmarsat AMSC traffic channel ?
1558.334 3372bps QPSK - Inmarsat AMSC LES
1558.346 3372bps QPSK - Inmarsat AMSC LES
1558.370 3372bps QPSK - Inmarsat AMSC LES
1558.3815 3372bps QPSK - Inmarsat AMSC LES rep. pat/idle
1558.3935 3372bps QPSK - Inmarsat AMSC LES rep. pat/idle
1558.430 3372bps QPSK - Inmarsat AMSC LES rep. pat/idle weak
1558.454 3372bps QPSK - Inmarsat AMSC LES rep. pat/idle
60W 1676.000 Digital data
GOES-10 1681.475 Digital data
(09/03/2008) 1692.700 Carrier
1694.000 Digital data
1694.300 Carrier
54.0W 1531.140 6Kbps BPSK Inmarsat-B/M
Inmarsat 3F4 1532.700 Wideband PSK 160KHz BGAN
1535.035 MFSK slow rate data 40bd Inmarsat-D
1535.045 MFSK slow rate data 20bd Inmarsat-D
1535.055 MFSK slow rate data 20bd Inmarsat-D
1535.0975 Seastar DGPS DGPS point to multipoint BPSK 2438bps
1535.115 Veripos DGPS correction data BPSK 2438bps
1535.185 Seastar DGPS point to multipoint BPSK 1219bps
1537.550 6Kbps BPSK Inmarsat-B/M
1537.560 6Kbps BPSK Inmarsat-B/M
1537.600 6Kbps BPSK Inmarsat-B/M
1537.700 NCS 044 - Network Coordination Station TDMA BPSK 1200bps
1537.860 MFSK slow rate data 20bd Inmarsat-D
1537.880 MFSK slow rate data 20bd Inmarsat-D
1537.890 MFSK slow rate data 20bd Inmarsat-D
1537.900 MFSK slow rate data 20bd Inmarsat-D
1538.010 6Kbps BPSK Inmarsat-B/M
1538.020 6Kbps BPSK Inmarsat-B/M
1538.030 6Kbps BPSK Inmarsat-B/M
1538.040 6Kbps BPSK Inmarsat-B/M
1538.060 6Kbps BPSK Inmarsat-B/M
1538.120 6Kbps BPSK Inmarsat-B/M NCS
1538.380 ID 002 - MFSK slow rate data 20bd Inmarsat-D Bulletin Board
1539.525 LES 021 - France Telecom MSC TDMA BPSK 1200bps
1539.535 LES 001 - Southbury USA TDMA BPSK 1200bps
1539.555 LES 002 - Stratos Burum Netherlands TDMA BPSK 1200bps
1539.565 LES 004 - EIK Telenor Norway TDMA BPSK 1200bps
1539.585 LES 012 - Stratos Burum Netherlands TDMA BPSK 1200bps
1539.685 LES 003 - KDDI Yamaguchi Japan TDMA BPSK 1200bps
1539.750 MFSK slow rate data 20bd Inmarsat-D
1539.7575 ID 012 - MFSK slow rate data 40bd Inmarsat-D
1539.760 MFSK slow rate data 20bd Inmarsat-D
1539.7675 MFSK slow rate data 20bd Inmarsat-D
1539.770 MFSK slow rate data 20bd Inmarsat-D
1539.7775 MFSK slow rate data 20bd Inmarsat-D
1539.7825 MFSK slow rate data 20bd Inmarsat-D
1539.785 MFSK slow rate data 20bd Inmarsat-D
1539.7875 MFSK slow rate data 20bd Inmarsat-D
1539.790 MFSK slow rate data 20bd Inmarsat-D
1541.280 6Kbps BPSK Inmarsat-B/M NCS
1542.500 Wideband PSK 160KHz BGAN
1545.02000 NCS - AERO 600Bd GMSK
1545.02500 GES-005 Aussaguel - AERO 600Bd GMSK
1545.05500 GES-002 Southbury - AERO 600Bd GMSK
1545.07000 GES-002 Southbury - AERO 600Bd GMSK
1545.09000 GES-005 Aussaguel - AERO 600Bd GMSK
1545.10000 GES-005 Aussaguel - AERO 600Bd GMSK
1545.20500 GES-002 Southbury - AERO 600Bd GMSK
1545.900 Wideband PSK 160KHz BGAN
1546.0475 GES-002 Southbury - Aero-I control / messaging
1546.062 GES-005 Aussaguel - Aero-I control / messaging
1536.0925 GES-002 Southbury - Aero-I control / messaging
1547.640 Wideband PSK 40KHz
33.5W 1540.870 TT&C sidebands at +- 4KHz
Marisat-F2
15.43W 1526.280 6Kbps BPSK Inmarsat-B/M
Inmarsat 3F2 1528.290 6Kbps BPSK Inmarsat-B/M
1528.300 6Kbps BPSK Inmarsat-B/M
1532.490 6Kbps BPSK Inmarsat-B/M
1535.075 Seastar DGPS point to multipoint 1219bps
1535.090 Seastar DGPS point to multipoint 2438bps
1535.105 Veripos DGPS correction data 2438Bd BPSK point to multipoint circuit 8192bit frame
1535.170 StarFire space-based GPS augmentation service (1200bps BPSK)
1536.250 256bps BPSK 1 second framing (perhaps for Russian Volna system)
1537.120 6Kbps BPSK Inmarsat-B/M
1537.1395 6Kbps BPSK Inmarsat-B/M
1537.150 6Kbps BPSK Inmarsat-B/M
1537.160 6Kbps BPSK Inmarsat-B/M
1537.170 6Kbps BPSK Inmarsat-B/M
1537.190 6Kbps BPSK Inmarsat-B/M
1537.200 6Kbps BPSK Inmarsat-B/M
1537.210 6Kbps BPSK Inmarsat-B/M
1537.220 6Kbps BPSK Inmarsat-B/M
1537.320 6Kbps BPSK Inmarsat-B/M NCS
1537.550 6Kbps BPSK Inmarsat-B/M
1537.600 6Kbps BPSK Inmarsat-B/M
1537.680 6Kbps BPSK Inmarsat-B/M
1537.710 LES 103 - KDDI Yamaguchi Japan TDMA BPSK 1200bps
1537.750 Inmarsat TDM channel 1200bd DBPSK (xBr recording QRT 31/12/07)
1537.870 ID 102 - MFSK slow rate data 20bd Inmarsat-D Bulletin Board
1538.220 6Kbps BPSK Inmarsat-B/M NCS
1539.175 1200bps DBPSK (possibly inter LES comms X25 based)
1539.180 1200bps DBPSK (possibly inter LES comms X25 based)
1539.185 1200bps DBPSK (possibly inter LES comms X25 based)
1539.190 1200bps DBPSK (possibly inter LES comms X25 based)
1539.195 1200bps DBPSK (possibly inter LES comms X25 based)
1539.200 1200bps DBPSK (possibly inter LES comms X25 based)
1539.205 1200bps DBPSK (possibly inter LES comms X25 based)
1539.210 1200bps DBPSK (possibly inter LES comms X25 based)
1539.215 1200bps DBPSK (possibly inter LES comms X25 based)
1539.220 1200bps DBPSK (possibly inter LES comms X25 based)
1539.225 1200bps DBPSK (possibly inter LES comms X25 based)
1539.230 1200bps DBPSK (possibly inter LES comms X25 based)
1539.235 1200bps DBPSK (possibly inter LES comms X25 based)
1539.240 1200bps DBPSK (possibly inter LES comms X25 based)
1539.255 1200bps DBPSK (possibly inter LES comms X25 based)
1539.260 1200bps DBPSK (possibly inter LES comms X25 based)
1539.275 1200bps DBPSK (possibly inter LES comms X25 based)
1539.280 1200bps DBPSK (possibly inter LES comms X25 based)
1539.295 1200bps DBPSK (possibly inter LES comms X25 based)
1539.300 1200bps DBPSK (possibly inter LES comms X25 based)
1539.305 1200bps DBPSK (possibly inter LES comms X25 based)
1539.310 1200bps DBPSK (possibly inter LES comms X25 based)
1539.325 1200bps DBPSK (possibly inter LES comms X25 based)
1539.330 1200bps DBPSK (possibly inter LES comms X25 based)
1539.505 LES 112 - Station 12 Holland TDMA BPSK 1200bps
1539.515 LES 116 - Psary Polish Telecom TDMA BPSK 1200bps
1539.595 LES 104 - EIK Telenor Norway TDMA BPSK 1200bps
1539.615 LES 102 - Stratos Burum Netherlands TDMA BPSK 1200bps
1539.625 LES 114 - Tangua Embratel Brazil TDMA BPSK 1200bps
1539.635 LES 117 - Nudol Morsviasputnik Russia TDMA BPSK 1200bps
1539.645 LES 120 - Thermopylae Greece TDMA BPSK 1200bps
1539.655 LES 112 - Station 12 Holland TDMA BPSK 1200bps (not always tx'ing)
1539.695 LES 105 - Fucino Telecom Italia TDMA BPSK 1200bps
1539.7625 MFSK slow rate data 20bd Inmarsat-D - QRT?
1539.7725 MFSK slow rate data 20bd Inmarsat-D - QRT?
1539.955 LES 101 - Southbury USA TDMA BPSK 1200bps
1539.965 LES 122 - Stratos Global Australia TDMA BPSK 1200bps (Tnx `r00t) (on demand)
1539.985 LES 127 - Emeq-Haela Bezeq Israel TDMA BPSK 1200bps (Tnx `r00t) (on demand)
1539.985 LES 116 - Psary Polish Telecom TDMA BPSK 1200bps (on demand)
1539.995 LES 121 - France Telekom MSC TDMA BPSK 1200bps (pjm recording)
1541.000 Continuous carrier
1541.0175 MFSK slow rate data 20bd Inmarsat-D
1541.0275 MFSK slow rate data 20bd Inmarsat-D
1541.0475 ID 103 - MFSK slow rate data 40bd Inmarsat-D?
1541.1275 ID 103 - MFSK slow rate data 40bd Inmarsat-D (same tfc as 1541.0475)
1541.450 LES 144 - NCS
1541.700 BGAN
1543.700 24K DBPSK (new 31/03/2009)
1544.500 SAREX downlink
1545.01500 NCS - AERO 600Bd GMSK
1545.03000 GES-103 Aussaguel - AERO 600Bd GMSK
1545.03500 GES-104 Eik - AERO 1200Bd GMSK
1545.04000 GES-103 Aussaguel - AERO 600Bd GMSK
1545.04500 GES-104 Eik - AERO 1200Bd GMSK
1545.09500 GES-104 Eik - AERO 600Bd GMSK
1545.19500 NCS - AERO 600Bd GMSK
1545.100 Inmarsat data (xBr recording)
1546.055 GES-104 Eik - Aero-I control / messaging
1546.070 GES-103 Aussaguel - Aero-I control / messaging
1546.085 GES-104 Eik - Aero-I control / messaging
1548.500 1000bps BPSK
1575.420 EGNOS overlay
0W 1686.830 WB data - approx 750KHz wide (has 8X carriers each side)
Meteosat 1691.000 Meteosat APT / WEFAX
QRT 14/06/06 1693.830 Carrier
1694.500 Meteosat HRPT
1695.665 Chopped carrier
1695.720 PSK Data
1695.755 Data (GMSK?)
1695.785 Data (GMSK?)
21E 1469.000 DVB Mux
Afristar 1471.000 DVB Mux
1473.000 DVB Mux
1475.000 DVB Mux
1488.000 DVB Mux
1490.000 DVB Mux
1491.699 Afristar TT&C
24.88E 1528.250 3372bps QPSK - Inmarsat AMSC LES
Inmarsat 4F2 1528.310 3372bps QPSK - Inmarsat AMSC LES
1532.910 3372bps QPSK - Inmarsat AMSC LES
1533.660 BPSK 6000Bd
1533.670 BPSK 6000Bd
1533.680 BPSK 6000Bd
1533.690 BPSK 6000Bd
1535.080 Veripos / Seastar DGPS correction data 2438Bd BPSK (High Power)
1535.1525 Veripos / Seastar DGPS correction data 2438Bd BPSK (High Power)
1535.165 Veripos DGPS correction data 2438Bd BPSK (High Power)
1536.201 BPSK 3840Bd DSSS Drifting -86Hz/10min, recync after 7mins
1537.6375 BPSK 6000Bd
1545.540 BPSK 1200Bd 106.7ms ~ 128bit
1548.358 BPSK DSSS coderate=5187
1548.420 BPSK DSSS coderate=5187
1548.525 BPSK 1125Bd 56.9ms ~ 68bit (changed to fast 4800Bd? BPSK for a while)
1545.540 StarFire space-based GPS augmentation service (1200bps BPSK)
1551.584 84375.22 sym/s BPSK code = 1111100110010100 1010010001000111 neg ACF @ 2451, pos @ 3687, 16400bit long frame
1551.752 84375.22 sym/s BPSK code = 1111100110010100 1010010001000111 neg ACF @ 2451, pos @ 3687, 16400bit long frame
1552.088 84375.22 sym/s BPSK code = 11100100 01001110 neg ACF @ 2451, pos @ 3687, 16368bit long frame
1557.735 84375.22 sym/s BPSK code = 11100100 01001110 neg ACF @ 2451, pos @ 3687, 16368bit long frame
1557.902 84375.22 sym/s BPSK code = 11100100 01001110 neg ACF @ 2451, pos @ 3687, 16368bit long frame
1548.358 21093.77 sym/s BPSK code = 1111100110010100 1010010001000111 neg ACF @ 2451, pos @ 3687
1548.420 21093.77 sym/s BPSK code = 1111100110010100 1010010001000111 4x66=264frame / 16368bit long frame
1575.420 Egnos overlay data (xBr recording)
57E 1691.007 Meteosat APT/WEFAX
64.5E 1533.100 BGAN
Inmarsat 3F1 1534.100 BGAN
1534.980 6Kbps BPSK Inmarsat-B/M NCS
1535.070 Veripos DGPS correction data BPSK 2438bps
1535.090 Seastar DGPS point to multipoint BPSK 2438bps
1535.115 Veripos DGPS correction data BPSK 2438bps
1535.1525 Veripos DGPS correction data BPSK 2438bps
1535.1575 Seastar DGPS point to multipoint BPSK 1219bps
1537.100 NCS TDMA BPSK 1200bps
1537.320 NCS Mini-M
1537.340 NCS Mini-M
1537.550 6Kbps BPSK Inmarsat-B/M
1537.560 6Kbps BPSK Inmarsat-B/M
1537.590 6Kbps BPSK Inmarsat-B/M
1537.600 6Kbps BPSK Inmarsat-B/M
1537.6375 6Kbps BPSK Inmarsat-B/M
1537.670 6Kbps BPSK Inmarsat-B/M
1537.680 6Kbps BPSK Inmarsat-B/M
1537.920 6Kbps BPSK Inmarsat-B/M
1537.930 6Kbps BPSK Inmarsat-B/M
1537.995 ID 302 - MFSK slow rate data 20bd Inmarsat-D Bulletin Board
1538.180 NCS (Inmarsat B / M)
1539.355 LES 330 - Vishipel Viewnam TDMA BPSK 1200bps
1539.365 LES 303 - KDDI Yamaguchi TDMA BPSK 1200bps
1539.385 LES 335 - Fucino Telecom Italia TDMA BPSK 1200bps
1539.395 LES 301 - Telenor Satellite Services Inc TDMA BPSK 1200bps
1539.405 LES 316 - Psary Polish Telecom TDMA BPSK 1200bps
1539.415 LES 312 - Stratos Global Australia TDMA BPSK 1200bps (local = 0)
1539.425 LES 301 - Southbury USA TDMA BPSK 1200bps
1539.435 LES 305 - Thermopylae Greece TDMA BPSK 1200bps
1539.455 LES 304 - EIK Telenor Norway TDMA BPSK 1200bps
1539.465 LES 328 - Sentosa Singapore TDMA BPSK 1200bps
1539.485 LES 302 - Stratos Burum Netherlands TDMA BPSK 1200bps
1539.495 LES 311 - Beijing MCN China TDMA BPSK 1200bps
1539.705 LES 312 - Stratos Global Australia TDMA BPSK 1200bps (local = 1)
1539.772 MFSK slow rate data 20bd Inmarsat-D
1539.777 MFSK slow rate data 20bd Inmarsat-D
1539.945 LES 341 - Vishipel Viewnam (IOR) TDMA BPSK 1200bps
1539.975 LES 317 - Nudol Morsviasputnik Russia TDMA BPSK 1200bps
1540.948 MFSK slow rate data 20bd Inmarsat-D
1540.958 MFSK slow rate data 20bd Inmarsat-D
1540.968 MFSK slow rate data 20bd Inmarsat-D (reserved channel)
1540.978 MFSK slow rate data 20bd Inmarsat-D (reserved channel)
1541.460 6Kbps BPSK Inmarsat-B/M spot beam
1542.900 BGAN
1545.00500 GES 301 Eik - AERO 600Bd GMSK
1545.08000 GES 305 Perth - AERO 600Bd GMSK
1545.19000 NCS - AERO 600Bd GMSK
1546.0175 Aero-I control / messaging
1546.0625 Aero-I control / messaging
1546.0775 Aero-I control / messaging
109.02E
Inmarsat 2F4
143.2E 1535.1375 Seastar DGPS point to multipoint BPSK 2438bps
Inmarsat 4F1 1535.175 Veripos DGPS correction data BPSK 2438bps (High Power)
178.04E 1526.290 Std-B LES:FC ChID:1 ChFN:2 Beam:05
Inmarsat 3F3 1526.290 Std-B LES 0xFC
1528.290 Std-B LES:FC ChID:1 ChFN:2 Beam:06
(tnx trango) 1528.300 Std-B LES:FC ChID:1 ChFN:2 Beam:04
(and r00t) 1528.300 Std-B LES 0xFC
(26/03/09) 1530.765 Std-Mini-M data
1530.925 Std-Mini-M data
1532.480 Std-B LES:FC ChID:1 ChFN:2 Beam:02
1535.015 P2MP 2438.1BPSK Fugro SeaStar DGPS {ID=0x2873 SCR=0x3041}
1535.105 Veripos DGPS correction data BPSK 2438bps
1535.115 Seastar DGPS point to multipoint BPSK 2438bps
1535.135 SkyFire DGPS 1200BPSK
1536.670 Std-B LES:FC ChID:1 ChFN:2 Beam:01
1536.920 Std-B LES:00 ChID:1 ChFN:A Beam:01
1537.320 Std-B NCS
1537.590 Std-B LES 0xFC
1537.600 Std-B LES:FC ChID:1 ChFN:3 Beam:00
1537.865 Std-D tfc ch
1537.870 ID 202 - MFSK slow rate data 20bd Inmarsat-D Bulletin Board
1538.220 Std-M / Mini-M NCS
1539.505 LES 212 - Stratos Burum Netherlands TDMA BPSK 1200bps
1539.515 LES 203 - KDDI Yamaguchi Japan TDMA BPSK 1200bps
1539.595 LES 204 - EIK Telenor Norway TDMA BPSK 1200bps
1539.605 LES 210 - Sentosa Singapore TDMA BPSK 1200bps
1539.615 LES 221 - France Telecom MSC TDMA BPSK 1200bps
1539.625 LES 202 - Stratos Global New Zealand Auckland TDMA BPSK 1200bps
1539.635 LES 217 - Nudol Morsviasputnik Russia TDMA BPSK 1200bps
1539.995 LES 211 - Beijing MCN China TDMA BPSK 1200bps
1541.0175 MFSK slow rate data 20bd Inmarsat-D
1541.0275 MFSK slow rate data 20bd Inmarsat-D
1541.0375 MFSK slow rate data 20bd Inmarsat-D
1541.0475 MFSK slow rate data 20bd Inmarsat-D
1541.450 LES 244 - NCS
1542.378 Std-B LES:00 ChID:1 ChFN:A Beam:00 BGAN 33.6 !!
1542.380 BGAN 33.6kbps
1545.000 GES-202 Santa Paula - AERO 600GMSK
1545.025 GES-??? - AERO 600GMSK (no tfc in recording)
1545.030 GES-205 Perth - AERO 600GMSK
1545.035 GES-??? - AERO 600GMSK (no tfc in recording)
1545.040 GES-202 Santa Paula - AERO 600GMSK
1545.090 GES-205 Perth - AERO 600GMSK
1545.940 1200BPSK unk proto
1546.035 BGAN narrowband
1546.045 BGAN narrowband
1546.060 BGAN narrowband
1546.765 Std-B LES:00 ChID:1 ChFN:A Beam:04
1547.635 Std-B LES:00 ChID:1 ChFN:A Beam:02
1548.780 BGAN narrowband on demand
1548.825 Std-B LES:00 ChID:1 ChFN:A Beam:06
1548.995 Std-B LES:00 ChID:1 ChFN:A Beam:05
Galileo LEO 1176.450 DSSS 23MHz b/w
See chart below 1196.910 DSSS 23MHz b/w
1202.025 DSSS 23MHz b/w
1269.031 DSSS 18MHz b/w
1271.077 DSSS 20MHz b/w
1276.192 DSSS 23MHz b/w
1278.750 DSSS 23MHz b/w
1281.307 DSSS 23MHz b/w
1286.422 DSSS 23MHz b/w
1288.468 DSSS 23MHz b/w
1561.186 DSSS 4MHz b/w
1564.050 DSSS 4MHz b/w
1565.190 DSSS 4MHz b/w
1569.486 DSSS 4MHz b/w
1573.987 DSSS 4MHz b/w
1576.852 DSSS 4MHz b/w
1581.353 DSSS 4MHz b/w
1585.650 DSSS 4MHz b/w
1586.789 DSSS 4MHz b/w
1589.653 DSSS 4MHz b/w
Metop-A 1701.300 HRPT 3.5Mbps QPSK
1544.500 SARSAT transponder
Iridium LEO 1616-1626.5 Iridium Phone to Satellite (Thanks to IW for this info)
Simplex Channel 1616-1626.5 Satellite to Iridium Phone/Pager
1 1626.020833 Guard Channel
2 1626.062500 Guard Channel
3 1626.104167 Quaternary Messaging
4 1626.145833 Tertiary Messaging
5 1626.187500 Guard Channel
6 1626.229167 Guard Channel
7 1626.270833 Ring Alert
8 1626.312500 Guard Channel
9 1626.354167 Guard Channel
10 1626.395833 Secondary Messaging
11 1626.437500 Primary Messaging
12 1626.479167 Guard Channel
Duplex Channels Lower Edge Upper Edge
1 1616.000000 1616.333333
2 1616.333333 1616.666667
3 1616.666667 1617.000000
4 1617.000000 1617.333333
5 1617.333333 1617.666667
6 1617.666667 1618.000000
7 1618.000000 1618.333333
8 1618.333333 1618.666667
9 1618.666667 1619.000000
10 1619.000000 1619.333333
11 1619.333333 1619.666667
12 1619.666667 1620.000000
3 1620.000000 1620.333333
14 1620.333333 1620.666667
15 1620.666667 1621.000000
16 1621.000000 1621.333333
17 1621.333333 1621.666667
18 1621.666667 1622.000000
19 1622.000000 1622.333333
20 1622.333333 1622.666667
21 1622.666667 1623.000000
22 1623.000000 1623.333333
23 1623.333333 1623.666667
24 1623.666667 1624.000000
25 1624.000000 1624.333333
26 1624.333333 1624.666667
27 1624.666667 1625.000000
28 1625.000000 1625.333333
29 1625.333333 1625.666667
30 1625.666667 1626.000000
GLONASS Constellation
L1 1598.0625 & 1607.0625 (1603.700 xBr recording)
L2 1242.9375 & 1249.9375
L3/L5 1198.546875 & 1205.296875
GPS MEO Constellation
L1 1575.420 (xBr recording)
L2 1277.600
AFSTAR POD - Inmarsat C transceive antenna -
ideal for use in an L-band receive system.
The picture below shows the PCB layout. On the
left hand side, the power amplifier can clearly be seen. The PA consists of 5
microwave transistors; The part numbers, going in a counter-clockwise direction
are : 2 X 2SC2340, MRA1600-2, MRA1600-13 and the final is an MRA564. This is
also the path that the transmit RF takes, although it's passed through a gain
block first, after the input duplexer. On the right hand side, the receive
section is shown. The receive path is: Front end antenna duplexer followed by a
2 stage low noise gasfet preamp, followed by a helical filter centred on 1553.25
with a bandwidth of 46Mhz. This filter is then followed by a gain block (8 pin
sm IC) and another filter centred on 1553.25 with a bandwidth of 46Mhz. Finally,
another gain block, and then into the output duplexer which feeds the N
connector coax feed. There is a DC tap from the N connector, and this supplies
voltage to the PSU circuits.
(above) Inside the Afstar POD antenna. |
(above) pin connections on the bottom of the
POD antenna. |
| A |
Ground |
| B |
TX/RX Control (+VDC Transmit)
|
| C |
Power control (+VDC = High
power) |
| D |
Control Return (Ground - can
be connected to A) |
| E |
Transmit Indicator (output) |
| F |
HPA over temperature
indicator (output) |
The reason for the additional ground on pin D is
as follows: Blue water ships often use isolated grounding to help prevent
electrolytic actions taking place. In an amateur environment, it is possible to
connect pins A and D together. (Thanks to JDN for this info) Pins B,C and D are
all opto isolated.
The pictures below shows the omni-directional
antenna that's used in the pod antenna. As far as can be told, it seems to be a
set of phased 1/2 wave antenna's. There is a phasing harness between the two
aluminium discs, and this outputs to the duplexer input on the above PCB. The
antenna is not suitable for feeding a dish, as it's omni-directional and right
hand circular. The
antenna works very well attached directly to a GPS, although if its to be used
for wider coverage at L-Band, then the internal filters will need removing and
replacing with semi rigid links.
(above) Modified antenna suitable for feeding a
dish. |
(above) Original onmi-directional antenna |
(above) Omni antenna removed for GPS use. |
|
