Well even today, surprisingly, they still produce them. With
just a little searching I found this page for West & Central Africa. It now
looks like they work it all out on a spreadsheet.
Saturday 30 May 2015
Frequency Guide
I was always fascinated by the frequency charts that used to
appear in London Calling, codifying
and condensing all the shortwave and medium wave listening – VHF in Berlin, of
course – to the BBC World Service. You can almost imagine someone having to
draft them out on a sheet of graph paper. This one dates from July 1977.
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