Inmarsat Antenna Distribution

Inmarsat L-Band signals from both CONUS and POR need to be routed to various receivers and SDRs, this distribution system is a pretty simple solution (as shown below).

Inmarsat Antenna Distribution.

Inmarsat Antenna Distribution.

It’s based on taking an L-Band signals from a dish, where pre-amplification at the feed is already done and then feeding it to another L-Band amplifier, followed by a band-pass filter (since the previous amplifier is rather wide) and then finally to an L-Band splitter. Various receivers and SDRs are then connected to the output of the splitters. The amplifiers, band-pass filters and splitters are all from mini-circuits. Another view is shown below.

Inmarsat Antenna Distribution.

Inmarsat Antenna Distribution.

The two L-Band amplifiers require 12V for proper operation. Control of the supply voltage is feed through a “web relay” for remote control. The web control relay is a compant called KMtronic – thet are available on Ebay. Below is a closeup of the web relay.

Web Control Relay.

Web Control Relay.

There is some built in web server application that you can access from ant browser as shown below.

Web browser interface.

Web browser interface.

While it’s convenient to have access via a web browser I prefer to use a standalone application, so that will be my next project, stay tuned.

Category(s): Inmarsat, Projects
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