Portuguese ham radio repeaters coverage analysis

In some countries, when someone wants to put up a repeater a coverage analysis must be presented. In Portugal there isn’t such a requirement so, as far as I know, nobody took the effort before to try to see what is exactly the Portuguese ham radio repeaters coverage. Well, nobody until now.

What I did was to run a simulation using SPLAT!. SPLAT! is a “RF Signal Propagation, Loss, And Terrain analysis tool for the electromagnetic spectrum between 20 MHz and 20 GHz”. I used this windows build that features a nice GUI environment (although in the end I just used console commands). I did the Longley-Rice type analysis, which is a method designed to predict the attenuation of signals over large areas on irregular terrains.

To do this, I needed a full week of computer time. And this running two, sometimes three simulations at the time. I did a batch file on windows that just kept simulations running one after the other, so I didn’t have to constantly monitor and act on the simulation procedure.

The results can be seen repeater by repeater by taking a look at the data on this link. It contains zip files, one for each repeater. They all contain the required *.kml and *.png files, required for Google Earth visualization, which is the software I use myself to see the results.

Here is a taste of the results, in this case for the CQOVSE repeater (VHF repeater on the highest mountain peak in mainland Portugal ~2000m high):

sim1

sim2

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