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160, 80 and 40 meter class D exciter




 
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Author Topic: 160, 80 and 40 meter class D exciter  (Read 1151 times)
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W9BHI
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« on: December 10, 2019, 05:36:56 PM »

Hello all,
I am looking for someone that could help me design a class D exciter that could produce around 25 watts of unmodulated carrier to drive a pair of 4-400a's.
There would be no need for an audio modulator.
I would like to make it band switched for 160, 80 and 40 meters.
I would be using a DDS vfo with a square wave output.
Any takers?
Thanks,
Don W9BHI
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N4LTA
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« Reply #1 on: December 12, 2019, 01:25:08 PM »

I think there are a few people here who can give you some guidance, but designing would require testing a prototype and some experimenting.

If I was going to do it myself, I would use a couple of GaN Mosfets in a  configuration like Nigel uses with a modern low side driver ICs. You could also use a half bridge with transformer gate drive.

At 100 watts  - you could use relays to switch in the required output filters for each band.

I am in the middle of testing this type of class D circuit now. I have not completed my project yet.

Pat Bunn

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W9BHI
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« Reply #2 on: December 14, 2019, 10:36:40 AM »

Pat,
Thanks for the reply.
I would be interested in the results of your project when you get it done.
Don W9BHI
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