Message	Date	From	Subject
10433	2014-11-09 17:08:25	Mark Meyer	Re: Digest Number 2232
After reading your comments about SWR protection for the RD16HHF devices and doing some experiments, I've decided zener protection is not worth it. When I did added the zeners, their capacitance required me to reduce the value of the normal capacitor across the output balun transformer which was easy to accomplish. I also noticed that the zeners ran very warm even though their voltage level should have been way above the rf voltage I was generating. Anyway, since I am only building a 5W QRP push-pull amp I don't think I can destroy the RD16HHFs no matter what I hook up to the output. Thanks for your help pushing me down the road. I have already made a lot of QSOs with the amp sitting on the bench. Mark WU0L

After reading your comments about SWR protection for the RD16HHF devices and doing some experiments, I've decided zener protection is not worth it. When I did added the zeners, their capacitance required me to reduce the value of the normal capacitor across the output balun transformer which was easy to accomplish. I also noticed that the zeners ran very warm even though their voltage level should have been way above the rf voltage I was generating.

Anyway, since I am only building a 5W QRP push-pull amp I don't think I can destroy the RD16HHFs no matter what I hook up to the output.

Thanks for your help pushing me down the road. I have already made a lot of QSOs with the amp sitting on the bench.

Mark WU0L