UHF-Satcom.com - L-Band monitoring (27/05/2013 20:11:13 +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 BGan system which allows IP LAN extensions over satellite - this is using an eBay sourced BGan modem which has been placed in promiscuous mode. In addition to BGan, Std-B, Mini-M, Std-C and Std-D+ are work in progress. 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
		1537.560	6Kbps BPSK Inmarsat-B/M
		1537.570	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
		1538.070	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
		1539.175	1200bps DBPSK - NCS to LESxxx ISL
		1539.180	1200bps DBPSK - LES021 to NCS ISL
		1539.185	1200bps DBPSK - NCS to LESxxx ISL
		1539.190	1200bps DBPSK - LES012 to NCS ISL
		1539.195	1200bps DBPSK - NCS to LESxxx ISL
		1539.200	1200bps DBPSK - LES002 to NCS ISL
		1539.205	1200bps DBPSK - NCS to LESxxx ISL
		1539.210	1200bps DBPSK - LES001 to NCS ISL
		1539.215	1200bps DBPSK - NCS to LESxxx ISL
		1539.220	1200bps DBPSK - LES003 to NCS ISL
		1539.235	1200bps DBPSK - NCS to LESxxx ISL
		1539.240	1200bps DBPSK - LES004 to NCS ISL
		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
		1541.410	6Kbps BPSK Inmarsat-B/M
		1542.500	Wideband PSK 160KHz BGAN
		1545.020	AERO-I 600bd / DPSK - ACARS LES NCS
		1545.025 	AERO-I 600bd / DPSK - ACARS LES GES-005 Aussaguel
		1545.055 	AERO-I 600bd / DPSK - ACARS LES GES-002 Southbury
		1545.060 	AERO-I 1200bd / DPSK - ACARS
		1545.065 	AERO-I 1200bd / DPSK - ACARS
		1545.070 	AERO-I 600bd / DPSK - ACARS LES GES-002 Southbury
		1545.090 	AERO-I 600bd / DPSK - ACARS LES GES-005 Aussaguel
		1545.100 	AERO-I 600bd / DPSK - ACARS LES GES-005 Aussaguel
		1545.160 	AERO-I 600bd / DPSK - ACARS
		1545.165 	AERO-I 600bd / DPSK - ACARS
		1545.205 	AERO-I 600bd / DPSK - ACARS LES GES-002 Southbury
		1545.900	Wideband PSK 160KHz BGAN
		1546.0475	AERO-I GES-002 Southbury - control / messaging
		1546.062	AERO-I GES-005 Aussaguel - control / messaging
		1536.0925	AERO-I GES-002 Southbury - control / messaging
		1547.640	Wideband PSK 40KHz
		
33.5W		1540.870	TT&C sidebands at +- 4KHz
Marisat-F2
EOL
	
15.43W		1526.290 	Inmarsat-B/M 6Kbps BPSK Spot beam identifier Beam:07 ChID:0 LES:FD
Inmarsat 3F2	1526.810 	Inmarsat-B/M 6Kbps BPSK Spot beam identifier Beam:05 ChID:0 LES:FD
		1528.290 	Inmarsat-B/M 6Kbps BPSK Spot beam identifier Beam:06 ChID:0 LES:FD
		1528.300 	Inmarsat-B/M 6Kbps BPSK Spot beam identifier Beam:04 ChID:0 LES:FD
		1529.260	Inmarsat-B channel
		1529.670	Inmarsat-B channel
		1529.690	Inmarsat-B channel
		1531.970	Inmarsat-B channel
		1531.990	Inmarsat-B channel
		1532.490 	Inmarsat-B/M 6Kbps BPSK Spot beam identifier Beam:03 ChID:0 LES:FD
		1533.510	Inmarsat-B channel
		1533.850	Inmarsat-B channel
		1534.360	Inmarsat-B channel
		1535.075	Seastar DGPS point to multipoint 1219bps
		1535.090	Seastar DGPS point to multipoint 2438bps
		1535.105	Veripos DGPS correction data 2438.1Bd BPSK point to multipoint circuit 8192bit frame
		1535.125	Fugro Omnistar 1219Sym/s
		1535.170	SkyFire space-based GPS augmentation service (1200bps BPSK)
		1536.030	Inmarsat-B channel
		1536.050	Inmarsat-B channel
		1536.070	Inmarsat-B channel
		1536.250	256bps BPSK 1 second framing (perhaps for Russian Volna system)
		1537.120	Inmarsat-B/M 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:0D
		1537.120	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:37
		1537.120	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:83
		1537.140	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:5A
		1537.150	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:81
		1537.160	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:02
		1537.160	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:4F
		1537.160	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:77
		1537.170	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:0C
		1537.170	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:29
		1537.170	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:A5
		1537.190	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:24
		1537.190	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:34
		1537.200	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:1C
		1537.200	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:56
		1537.200	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:74
		1537.210	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:46
		1537.210	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:9E
		1537.220	Inmarsat-B 6Kbps BPSK LES interlink Beam:00 ChID:0 LES:9A
		1537.320	Inmarsat-Mini-M 6Kbps BPSK NCS
		1537.550	Inmarsat-B/M 6Kbps BPSK NCS Beam:00 ChID:0 LES:FD
		1537.580 	ChFN:9 Beam:00 ChID:2 LES:B4
		1537.600	Inmarsat-B 6Kbps BPSK LES interlink Beam:00  ChID:0 LES:FD
		1537.680 	Inmarsat-B/M 6Kbps BPSK Spot beam identifier Beam:00 ChID:0 LES:FD
		1537.710	Inmarsat-C LES 103 - KDDI Yamaguchi Japan TDMA BPSK 1200bps
		1537.740 	ChFN:D Beam:00 ChID:2 LES:71
		1537.750	Inmarsat TDM channel 1200bd DBPSK (xBr recording QRT 31/12/07)
		1537.870	Inmarsat-D ID 102 - MFSK slow rate data 20bd Bulletin Board
		1538.050	Inmarsat-B channel
		1538.070	Inmarsat-B channel
		1538.200	Inmarsat-B channel
		1538.220	Inmarsat-B/M 6Kbps BPSK Primary NCS
		1538.260	Inmarsat-B channel
		1538.410	Inmarsat-B channel
		1538.430	Inmarsat-B channel
		1538.450	Inmarsat-B channel
		1538.470	Inmarsat-B channel
		1538.490	Inmarsat-B channel
		1539.010	Inmarsat-B channel
		1539.030	Inmarsat-B channel
		1539.050	Inmarsat-B channel
		1539.175	Inmarsat-C 1200bps DBPSK - NCS to LES120 ISL
		1539.180	Inmarsat-C 1200bps DBPSK - LES120 to NCS ISL
		1539.185	Inmarsat-C 1200bps DBPSK - NCS to LES112 ISL
		1539.190	Inmarsat-C 1200bps DBPSK - LES112 to NCS ISL
		1539.195	Inmarsat-C 1200bps DBPSK - LES102 to NCS ISL
		1539.200	Inmarsat-C 1200bps DBPSK - NCS to LES102 ISL
		1539.205	Inmarsat-C 1200bps DBPSK - NCS to LES101 ISL
		1539.210	Inmarsat-C 1200bps DBPSK - LES101 to NCS ISL
		1539.215	Inmarsat-C 1200bps DBPSK - NCS to LESxxx ISL
		1539.220	Inmarsat-C 1200bps DBPSK - LES104 to NCS ISL
		1539.225	Inmarsat-C 1200bps DBPSK - NCS to LESxxx ISL
		1539.230	Inmarsat-C 1200bps DBPSK - LES114 to NCS ISL
		1539.235	Inmarsat-C 1200bps DBPSK - NCS to LESxxx ISL
		1539.240	Inmarsat-C 1200bps DBPSK - LES105 to NCS ISL
		1539.255	Inmarsat-C 1200bps DBPSK - NCS to LESxxx ISL
		1539.260	Inmarsat-C 1200bps DBPSK - LES117 to NCS ISL - off air (11/02/11)
		1539.275	Inmarsat-C 1200bps DBPSK - NCS to LESxxx ISL - off air (11/02/11)
		1539.280	Inmarsat-C 1200bps DBPSK - LESxxx to NCS ISL - constantly idle
		1539.295	Inmarsat-C 1200bps DBPSK - NCS to LES121 ISL
		1539.300	Inmarsat-C 1200bps DBPSK - LES121 to NCS ISL
		1539.305	Inmarsat-C 1200bps DBPSK - NCS to LES103 ISL
		1539.310	Inmarsat-C 1200bps DBPSK - LES103 to NCS ISL
		1539.325	Inmarsat-C 1200bps DBPSK - NCS to LESxxx ISL - off air (11/02/11)
		1539.330	Inmarsat-C 1200bps DBPSK - LES116 to NCS ISL - off air (11/02/11)
		1539.505	Inmarsat-C LES 112 - Station 12 Holland TDMA BPSK 1200bps
		1539.515	Inmarsat-C LES 101 - Southbury USA TDMA BPSK 1200bps
		1539.595	Inmarsat-C LES 104 - EIK Telenor Norway TDMA BPSK 1200bps
		1539.615	Inmarsat-C LES 102 - Stratos Burum Netherlands TDMA BPSK 1200bps
		1539.625	Inmarsat-C LES 114 - Tangua Embratel Brazil TDMA BPSK 1200bps (not tx'ing 18/09/11)
		1539.635	Inmarsat-C LES 117 - Nudol Morsviasputnik Russia TDMA BPSK 1200bps
		1539.645	Inmarsat-C LES 120 - Thermopylae Greece TDMA BPSK 1200bps
		1539.655	Inmarsat-C LES 112 - Station 12 Holland TDMA BPSK 1200bps (not tx'ing 18/09/11)
		1539.675	Inmarsat-C LES 121 - France Telekom MSC TDMA BPSK 1200bps (pjm recording)
		1539.695	Inmarsat-C LES 105 - Fucino Telecom Italia TDMA BPSK 1200bps
		1539.7625	Inmarsat-D MFSK slow rate data 20bd - QRT?
		1539.7725	Inmarsat-D MFSK slow rate data 20bd - QRT?
		1539.810	Inmarsat-B channel
		1539.830	Inmarsat-B channel
		1541.000	Continuous carrier
		1541.0175	Inmarsat-D MFSK slow rate data 20bd
		1541.0275	Inmarsat-D MFSK slow rate data 20bd
		1541.0475	Inmarsat-C ID 103 - MFSK slow rate data 40bd Inmarsat-D?
		1541.1275	Inmarsat-C ID 103 - MFSK slow rate data 40bd Inmarsat-D (same tfc as 1541.0475)
		1541.450	Inmarsat-C LES 144 - NCS
		1541.700	BGAN
		1542.3775	Inmarsat Fleet/M4 Beam:00 40KHz strong ChID:1 LES:00
		1543.700	24K DBPSK (new 31/03/2009)
		1544.500	SARSAT downlink
		1545.01500 	AERO-I 600Bd GMSK LES NCS (perhaps spot beam ID)
		1545.03000 	AERO-I 600Bd GMSK LES GES-103 Aussaguel
		1545.03500 	AERO-I 1200Bd GMSK LES GES-104 Eik
		1545.04000 	AERO-I 600Bd GMSK LES GES-103 Aussaguel
		1545.04500 	AERO-I 1200Bd GMSK LES GES-104 Eik
		1545.09500 	AERO-I 600Bd GMSK LES GES-104 Eik
		1545.19500 	AERO-I 600Bd GMSK LES NCS
		1545.100	Inmarsat data (xBr recording)
		1545.2850	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.3025	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.3200	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.3375	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.3550	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.3725	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.3900	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.4250	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1545.4425	AERO-H+ traffic channel LPC codec OQPSK 8400bps
		1546.055	AERO-I GES-104 Eik - control / messaging
		1546.070	AERO-I GES-103 Aussaguel - control / messaging
		1546.085	AERO-I GES-104 Eik - control / messaging
		1546.100	AERO-I GES-104 Eik - control / messaging
		1546.1425	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.1475	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.1525	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.1675	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.1725	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.1775	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.1825	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.3575	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.3625	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.3675	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.3725	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.3775	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.3825	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.8250	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.8300	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.8350	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.8400	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.8500	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1546.8550	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1547.4150	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1547.4200	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1547.4250	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1547.4350	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1547.7050	Inmarsat Fleet/M4 Beam:03 40KHz weak ChID:1 LES:00
		1547.7500	Inmarsat Fleet/M4 Beam:06 40KHz ChID:1 LES:00
		1548.3125	Inmarsat Fleet/M4 Beam:04 40KHz weak ChID:1 LES:00
		1548.7650	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1548.7700	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1548.7750	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1548.7800	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1548.7900	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1548.9150	AERO-H+ traffic channel OQPSK 8400bps
		1548.9350	AERO-H+ traffic channel OQPSK 8400bps
		1548.9400	AERO-H+ traffic channel OQPSK 8400bps
		1548.9975	Inmarsat Fleet/M4 Beam:05 40KHz strong ChID:1 LES:00
		1549.6150	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1549.6200	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1549.6250	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1549.6300	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1549.6350	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1549.6400	AERO-H+ traffic channel ambe codec OQPSK 8400bps
		1550.025	Inmarsat Fleet/M4 Beam:07 40KHz wide ChID:1 LES:00
		1551.290	Inmarsat-B channel
		1552.040	Inmarsat-B channel
		1552.060	Inmarsat-B channel
		1552.080	Inmarsat-B channel
		1552.100	Inmarsat-B channel
		1553.370	Inmarsat-B channel
		1554.750	4800Bd BPSK idle unknown system control channel
		1554.890	Inmarsat-B channel
		1554.975	1200Bd GMSK (not AERO)
		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		1525.250	BGAN
Inmarsat 4F2	1525.350	BGAN
		1529.250	BGAN
		1529.350	BGAN
		1529.650	BGAN
		1532.050	Carrier
		1532.025	BGAN
		1532.075	BGAN
		1532.225	BGAN
		1533.100	BGAN
		1533.290	Carrier
		1534.100	BGAN
		1535.325	BGAN
		1535.450	BGAN
		1535.525	BGAN
		1535.575	BGAN
		1535.750	BGAN
		1535.950	BGAN
		1536.140	BPSK 6000Bd std-B Spot beam 0xED
		1536.201	BPSK 3840Bd DSSS Drifting -86Hz/10min, recync after 7mins
		1537.080	BPSK 6000Bd std-B LES 0xB6
		1537.350	BPSK 6000Bd std-B LES 0xB2
		1537.360	BPSK 6000Bd std-B [too weak]
		1537.440	BPSK 2438.1Bd P2MP Fugro DGPS
		1537.4525	BPSK 1200Bd viterbi 1/2 SkyFire DGPS
		1537.460	BPSK 2438.1Bd Veripos DGPS service P2MP 
		1537.525	Continuous carrier
		1537.580	BPSK 6000Bd std-B LES 0xB4
		1537.6375	BPSK 6000Bd
		1537.740	BPSK 6000Bd std-B NCS
		1537.760	BPSK 6000Bd std-M NCS
		1537.825	Continuous carrier
		1537.920	QPSK 8400Bd BGAN NCS/Global beam
		1538.850	BGAN
		1538.950	BGAN
		1539.8825	BPSK 2438.1Bd P2MP 1D2F Veripos DGPS (NewEAME beam)
		1539.9125	BPSK 2438.1Bd P2MP 5C08 Fugro DGPS (ESAT beam)
		1539.952	BPSK 2438.1Bd P2MP 5C08 unknown but probably Fugro
		1540.020	BPSK 1250Bd bursts, periodic
		1540.055	QPSK 4800Bd bursts, periodic, multiple stations?
		1540.300	BGAN
		1540.500	BGAN
		1540.700	BGAN
		1542.500	BGAN
		1545.115	GMSK 600Bd AERO-I LES GES-xxx
		1545.120	GMSK 1200Bd AERO-I LES GES-xxx
		1545.125	GMSK 1200Bd AERO-I LES GES-220
		1545.540	BPSK 1200Bd   106.7ms ~ 128bit
		1545.825	QPSK 8400Bd BGAN NCS/Global beam
		1546.0125	GMSK ??
		1546.0146	OQPSK 5200bd GES 220 
		1548.230	BPSK DSSS ~24000Bd
		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
		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
		1552.3415	BPSK 256Bd 1sec 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
		1575.420	Egnos overlay data (xBr recording)

46E		1531.220 	23651.25 sym/s Pi/4 QPSK TDMA
Thuraya-2	1531.315 	23651.25 sym/s Pi/4 QPSK TDMA
		1531.470 	23651.25 sym/s Pi/4 QPSK TDMA
		1531.625 	23651.25 sym/s Pi/4 QPSK TDMA
		1533.245 	116800 sym/s OQPSK
		1533.345 	23651.25 sym/s Pi/4 QPSK TDMA
		1536.188 	23651.25 sym/s Pi/4 QPSK TDMA
		1536.688 	23651.25 sym/s Pi/4 QPSK TDMA
		1543.220 	23651.25 sym/s Pi/4 QPSK TDMA
		1543.345 	23651.25 sym/s Pi/4 QPSK TDMA
		1543.845 	23651.25 sym/s Pi/4 QPSK TDMA
		1548.395 	23651.25 sym/s Pi/4 QPSK TDMA
		1548.595 	23651.25 sym/s Pi/4 QPSK TDMA
		1548.658 	23651.25 sym/s Pi/4 QPSK TDMA
		1549.339 	116800 sym/s OQPSK
		1550.063 	23651.25 sym/s Pi/4 QPSK TDMA
		1551.033 	23651.25 sym/s Pi/4 QPSK TDMA
		1551.315 	23651.25 sym/s Pi/4 QPSK TDMA
		1552.250 	23651.25 sym/s Pi/4 QPSK TDMA
		1552.563 	23651.25 sym/s Pi/4 QPSK TDMA
		1554.406 	23651.25 sym/s Pi/4 QPSK TDMA
		1554.437 	23651.25 sym/s Pi/4 QPSK TDMA
		1554.470 	23651.25 sym/s Pi/4 QPSK TDMA (on demand)
		1555.220 	23651.25 sym/s Pi/4 QPSK TDMA
		1555.532 	23651.25 sym/s Pi/4 QPSK TDMA
		1555.844 	23651.25 sym/s Pi/4 QPSK TDMA
		1556.375 	116800 sym/s OQPSK
		1556.469 	23651.25 sym/s Pi/4 QPSK TDMA
		1557.031 	23651.25 sym/s Pi/4 QPSK TDMA
		1557.563 	23651.25 sym/s Pi/4 QPSK TDMA
		1557.720 	23651.25 sym/s Pi/4 QPSK TDMA
		1557.875 	23651.25 sym/s Pi/4 QPSK TDMA

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 	AERO-I 600Bd GMSK GES 301 Eik
		1545.08000 	AERO-I 600Bd GMSK GES 305 Perth
		1545.19000 	AERO-I 600Bd GMSK NCS
		1546.0175	Aero-I control / messaging
		1546.0625	Aero-I control / messaging
		1546.0775	Aero-I control / messaging

109.02E		!!accurate frequency info needed!!
Inmarsat 2F4
		
143.2E		1535.1430 	Skyfire DGPS 1200Bd BPSK 
Inmarsat 4F1	1535.1825 	P2MP 2438.1Bd Fugro SeaStar DGPS {id=0xEB31 scr=0x3041}
		1545.010 	AERO-I 1200Bd GMSK LES, Idle/Zeroes     
		1545.023 	AERO-I 1200Bd GMSK LES, Idle/Zeroes     
		1545.103 	AERO-I 600Bd GMSK, NCS                  
		1546.455 	AERO-I 600Bd GMSK, NCS                  
		1546.465 	AERO-I 600Bd GMSK LES, 0x71? Idle/Zeroes
		1546.475 	AERO-I 600Bd GMSK LES, 0x71? Idle/Zeroes
		1546.485 	AERO-I 600Bd GMSK LES, 0x71? Idle/Zeroes
		1546.495 	AERO-I 600Bd GMSK LES, 0x71? Idle/Zeroes
			
178.04E		1526.290  	Std-B LES:FC  ChID:1  ChFN:2  Beam:05
Inmarsat 3F3	1526.290  	Std-B LES 0xFC
(tnx trango)	1528.290  	Std-B LES:FC  ChID:1  ChFN:2  Beam:06
(and r00t)	1528.300  	Std-B LES:FC  ChID:1  ChFN:2  Beam:04
(26/03/09)	1528.300  	Std-B LES 0xFC
		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	AERO-I 600Bd GMSK LES GES-202 Santa Paula
		1545.025	AERO-I 600Bd GMSK LES GES-??? (no tfc in recording)
		1545.030	AERO-I 600Bd GMSK LES GES-205 Perth
		1545.035	AERO-I 600Bd GMSK LES GES-??? (no tfc in recording)
		1545.040	AERO-I 600Bd GMSK LES GES-202 Santa Paula
		1545.090	AERO-I 600Bd GMSK LES GES-205 Perth
		1545.940  	1200BPSK unknown 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

Weather Satellites (Low Earth Orbiters)
Metop-A		1701.300	HRPT QPSK
		1544.500	SARSAT transponder		
Meteor-M1	1700.000 	HRPT QPSK TBC
		1705.000 	HRPT QPSK TBC
NOAA 15 	1702.500	HRPT QPSK
NOAA 16 	1702.500	HRPT QPSK
NOAA 17 	1698.000	HRPT QPSK
NOAA 18 	1702.500	HRPT QPSK
NOAA 19 	1698.000	HRPT QPSK
Feng Yun 1D 	1700.400	HRPT QPSK

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
		

		
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		1227.600

1694.500 digital weather data dissemination

Meteosat 0w data

Iridium satellite downlinks at 1616-1626.5 MHz

AOR-W Inmarsat MFSK channels (cf=1539.765MHz)

COSPAR-SARSAT downlink on 1544.500MHz

GLONASS downlink on 1603.700MHz

L3 Military GPS receiver board for guided missiles

Anti-jam GPS antenna cluster from Raytheon

21E Afristar 1491.699MHz TT&C

 

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.

www.uhf-satcom.com

(above) Inside the Afstar POD antenna.

www.uhf-satcom.com

(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.

www.uhf-satcom.com

(above) Modified antenna suitable for feeding a dish.

www.uhf-satcom.com

(above) Original onmi-directional antenna

(above) Omni antenna removed for GPS use.