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
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