Subj : Re: Thats Odd
To   : Holger Granholm
From : Tony Langdon
Date : Mon Mar 05 2018 07:06 pm

-=> Holger Granholm wrote to Tony Langdon <=-

 HG> We had a similar problem. The TV-sets manufactured in the 1950-1960's
 HG> had an IF-frequency of 21 MHz. Obviously we had to avoid working on the
 HG> 15m, and to some extent 40m bands, since 7 MHz * 3 = 21 MHz.

That would be a problem.  Also some 2 way radios have an IF of 21.4 MHz.  Fun
if there's some 15m activity nearby!

 HG> Luckily, in those early TV days, they were not transmitting programs
 HG> 24h/day, so we could operate ham radio outside TV-hours.

Here, that was after midnight. :)


.... It requires a very unusual mind to make an analysis of the obvious.
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