[Amps] crossmodulation in PA

[Peter Chadwick]

Over the years, this has been a well known problem on ships at HF, especially where they run full duplex telephony. Not that many do these days in the commercial field, but the military have a lot of experience of these effects. Somewhere I've a conference paper given some 20 odd years ago from the UK MoD people on the subject, which told how they traced it on anumber of ships. I remember them having a problem because in some cases, below a certain power level it disappeared abruptly.. Fortunately, the characteristics of tetrodes generally  make the transmitter  a negligible contributor, but the external environment is another matter. Worse at sea, of course because you've  got continuous corrosion!

73
Peter  G3RZP