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[Amps] LDMOS PAs and high power low pass filters/diplexers

To: Amps@contesting.com
Subject: [Amps] LDMOS PAs and high power low pass filters/diplexers
From: Conrad Farlow <conrad@g0ruz.com>
Reply-to: conrad@g0ruz.com
Date: Tue, 05 Feb 2013 00:35:41 +0000
List-post: <amps@contesting.com">mailto:amps@contesting.com>
I have been very fortunate and acquired a few nice 1kW class pallets for 6m, 2m and 70cms. They are fairly well known designs but as I have had absolutely no experience of these kinds of amplifiers I would like to do some reading. So are there any recommended papers application notes or books that I ought to be reading before I attempt to make these pallets into real world amplifiers?

I have had a look at the Freescale and NXP websites and I have not seen anything that suggests suitable heatsinks beyond what is required for the heat spreader, this makes me very nervous. I'll probably end up using something far too big!

I understand that over driving these devices for even a short space of time will cause instant device death, this is also very scary for a person brought up on triodes!

Finally low pass filters and or diplexers that can handle sufficient goo. I have never designed a high power diplexer before and would like to try, particularly for 6m so can anyone recommend any reading?

I have decided that I am done with tube PAs, I simply don't trust myself around lethal voltages any more.

73

Conrad G0RUZ


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