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Quite a few weeks ago I posted looking for info on VHF-AM receivers and
received a number of pointers to additional resources and study material. Thanks to all who responded and, in particular, to Pete-KE9OA who has been a tremendous help! Since then, several protos/learning platforms have been built and I'm pleased with the results overall - great learning experience (which continues). Now I'm interested in the transmit side of the equation and have been poring over the 'net and other materials/articles trying to get a grip on this part. So far I have a block diagram (or "blockhead" diagram more accurately 8-) of a two stage Mosfet widget using some VHF parts from Mitsubishi. Specifically, I'm thinking: 20 mW LO input - RD00HVS1 Mosfet - .5W - RD06HVF1 Mosfet = ~6W output. Modulation either transformerless (or transformer) using something like an audio amp (e.g. LM384) after suitable compression/limiting. Net result that I'm after is approximately 6W output using a 12-18VDC supply. So........... If anyone here can point out some worthwhile texts, articles, or similar designs that might apply I'd be grateful. BTW, before this sets off a string of cautionary tales and admonishments about newbie nitwits playing with transmitters (especially at Airband frequencies) - I can tell you this is a "bench only" project intended to feed a well-grounded 10W/50ohm dummy load ONLY... Are you kidding? I live in Arlington, VA - within walking distance of some of the world's biggest paranoids. I already worry about the splatter created by the blender when the wife and I mix up a batch of Margueritas! (we try not to simulate any "modulation" by hitting the "pulse" button 8-)......... Thanks for any help, Bill |
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