Hi to all
I am wanting to build an amp (wishful I think) from scratch for 70cm
(432MHz) to be used for EME work.
As I am just looking around for designs, what is a reasonable scheme (and
tubes) for something up to, or over, 1KW.
I know that is quite a range but in VK land we can apply for a special
permit for super high power EME work (our normal limit is 400W PEP) so the
upper limit is constrained by cost and practicality of the design and
supply.
I am hoping for something that could be driven with about 70W maximum, and
would work at something like AB1 or 2 (not Class C) for SSB work.
Is there anything commerically available that does this sort of output that
would be worth considering?
Or would it be specialised enough to have to be built from the ground up?
Is grounded grid with Pi-L output still practical at 70cm?
I suppose if anyone could advise firstly as to appropiate tube/s to use then
I could work through the other steps as seperate issues from there.
I am wanting to move to 70cm as I have been working on a magnetron project
for 2.4GHz but now want to get something a little more manageable wavelength
wise (and less dangerous the magnetron puts out 700W) but my PLL circuitry
needs a lot of work and I am only using it with narrow band FM at present.
Otherwise I will be forced to continue to run the gauntlet of being
prematurely blind.
All ideas appreciated
Regards
Noel VK4KNW
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