If I recall correctly, it was a 21 mHz IF that caused the problem for hams on 15m. Later, TV IFs were moved into the 40 mHz range. 73, Roger On 4/3/2014 11:35 AM, Dale J. wrote: > > The 15 Mc. IF was in the TV's and notorious for receiving ham signals, but it was our fault anyway. > > 73 > Dale, k9vuj > > >