-=> 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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