[AMPS] Cavity Amp designs for 432 Mhz and 1200 Mhz??

a.p. apight@pa.net
Fri, 18 Feb 2000 08:24:07 -0500


Joe,
I don't have the design and machining information.  I do have a 6 X 7289 1296
amp for sale if you get your "driver" running. : )
Art   K3XF

Conrad Farlow wrote:

> ----- 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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