[Amps] crossmodulation in PA

[jeremy-ca]

Aboard USN ships RX and TX antennas were often parallel and only 30-60' 
apart. This was with WW2 and earlier technology. Transmitters were usually 
in the 500 to 2KW input range. TBK, TBM, TBL, FRT were some of the series 
designators.

Shore stations running 5-25+ KW used seperate facilities.

OT's will recognize the RAK/RAL and RBA, RBB, RBC series as especially 
bullet proof.

In the mid 60's transceivers such as the AN/URC-32 began to take over ship 
communication.

Carl
KM1H



----- Original Message ----- 
From: "Bill Fuqua" <wlfuqu00 at uky.edu>
To: <g3rzp at g3rzp.wanadoo.co.uk>; <amps at contesting.com>
Sent: Friday, September 07, 2007 9:40 AM
Subject: Re: [Amps] crossmodulation in PA


> 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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>
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