This might be of interest :
http://www.cabelcon.dk/technic/terms/PIM-english.pdf
>----- Oorspronkelijk bericht -----
>Van: Peter Chadwick [mailto:g3rzp@g3rzp.wanadoo.co.uk]
>Verzonden: vrijdag, september 7, 2007 10:46 AM
>Aan: amps@contesting.com
>Onderwerp: Re: [Amps] crossmodulation in PA
>
>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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