----- Original Message -----
From: Joseph Rodgers <jarodger@airmail.net>
To: <amps@contesting.com>
Sent: 18 February 2000 06:05
Subject: [AMPS] Cavity Amp designs for 432 Mhz and 1200 Mhz??
>
> Hi,
>
> I have been looking around for some design data on cavity amps for 432 and
> 1296 Mhz. I have not been able to find very much information though. There
> have been a couple of designs in the ARRL handbooks, but not a lot. Is
there
> somewhere else I should look?
>
> I want to build an amp using a tetrode (4CX250 family) amp for 432, or one
> for 1296 using the 2C39 or 3CX100A5. One or two tubes for either.
>
> Anyone got some information they could pass one, or point me in a
direction?
>
> Thanks
> Joe
> N5WY
Hello Joe for 432 there are 2 designs for 3cx800's and a design for an 8938
by K1FO in the ARRL UHF/Microwave projects manual volume1.This book also
contains the design for the single 2c39/7289 watercooled cavity by n6ca.All
the articles are very detailed.If you must use a tetrode for 432 consider
using a Svetlana 4cx400 it is cheap and will produce considerably more
output than a 4cx250b in the same design.I like russian tubes such as GI7B
(20 USD and about 350 watts out on 432) and GS35(100 usd and 1kW + on
432).N7ART and W9QXP have published designs for 432,I unfortunately don't
have these but would like them so if anyone could let me have them I would
be greatful.Good luck Joe and email me directly if I can be of any further
help.
73 de Conrad G0RUZ
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