Radio (shortwave, in this case), just for a change ...
You can have hours of fun these days with (clever) stuff like this:-
SDR. "Click to tune"!
I know there are a few ex-Signals types about on the forum (not to mention ex-REME Tels). Also Ham Radio enthusiasts, sea-going radio operators and so forth.
So ... is anyone up for a discussion on stuff like (to name but two of the
many possibilities):-
1) HF "skip-zone"
2) Shannon's Law
