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#1
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Although a little off topic for the group, this is about the only
group around remotely related... Anybody doing Inmarsat monitoring? A few years ago Inmarsat A was the dominant mode, but it's analog. Seems Inmarsat M, a digital mode, is now what's in vogue. Is it worth setting up an Inmarsat receiving station? I was a shortwave junkie in my earlier days and it seems Inmarsat has replaced HF for lots of utility comms... thanks all... Bob/WF3H --------------------------- to see who "wf3h" is, go to "qrz.com" and enter 'wf3h' in the field check my blog at: http://www.bobview.blogspot.com/ |
#2
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I wrote a 2 part article on monitoring and configuration a system to
receive INMARSAT for Monitoring Times magazine Feb/Mar 94. From my location in central Va. I can receive both the Atlantic Ocean Region East and West INMARSATs. The analog voice traffic from type A and B INMARSAT installations of different languages is much reduced from past years. There are lots of analog fax. A large antenna, minimally 6 ft., preferably 10 ft., .9db NF LNA, length of RG-6, 12VDC power supply, 20 db in line amp, "coffee can" feed for 1500-1600 mhz., 12VDC block that passes 1500 mhz. signals and necessary type F and N connector adapters are needed. It is assumed that a worthy receiver such as a R7000, R7100 or AOR 3000A is available. I can supply almost all of the components but in total, it does get expensive. The most expensive component is the low noise amplifier. The reception rules are different when attempting to receive microwave signals. You are correct about the trend of using INMARSAT M terminals. Bob wrote: Although a little off topic for the group, this is about the only group around remotely related... Anybody doing Inmarsat monitoring? A few years ago Inmarsat A was the dominant mode, but it's analog. Seems Inmarsat M, a digital mode, is now what's in vogue. Is it worth setting up an Inmarsat receiving station? I was a shortwave junkie in my earlier days and it seems Inmarsat has replaced HF for lots of utility comms... thanks all... Bob/WF3H --------------------------- to see who "wf3h" is, go to "qrz.com" and enter 'wf3h' in the field check my blog at: http://www.bobview.blogspot.com/ |
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