A few weeks ago, I added the coverage maps for DAB and FM transmitters to UK Free TV. I am now very happy to say that the site now has coverage maps for Medium Wave stations as well.
Now, for 199 locations, 392 transmissions on 75 frequencies you can see an approximate coverage area, such as this one:
The maps shows the approximate coverage area. With Medium Wave transmissions, the signal levels you recieve are different at day and night, and can vary over time.
If you want to see the list of AM signals, click here or on this image:
The coverage areas are based on the 1982 FCC document by Robert Eckert "Modern Methods of Calculating Ground-Wave Field Strength over a Smooth Spherical Earth".
I had to take the original code, which was in the FORTRAN language and covert it to PHP. If you fancy having a look at complex numbers done in PHP, you can view the code here.
I'm not sure how much longer the AM services will be around, so this may just be an historical record of their passing.
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