Thanks for all the suggestions on the bike radio. I googled around a bit and found a schematic that seems very similar to the little receiver I'm working with. I almost certainly would be better off starting anew (perhaps keeping the AF circuitry). But it is interesting to see how a simple AM receiver works. That first transistor is an autodyne circuit -- both a mixer and a oscillator.
Our book: "SolderSmoke -- Global Adventures in Wireless Electronics"http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20
Posts
when the oscillator and mixer are combined, it is called a converter stage. I would be half tempted to rewind the ferite rod antenna and the oscillator coils for 40 meters. Rig up some sort of controlled feedback in the IF for a BFO and call it a day. - KA9OOI Mark in the corn fields of Indiana
ReplyDelete