[Amps] crossmodulation in PA

[Bill Fuqua]

In the old days military sites had the receiving equipment and antennas a 
few miles away from the transmitting site to avoid a number of problems. 
Naturally receivers those days were easily overloaded by off frequency 
signals.

73
Bill wa4lav


At 04:46 AM 9/7/2007 -0400, Peter Chadwick wrote:
>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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