On 4/27/2020 11:03 AM, Fred Jensen wrote: > What was it with the FCC and the Colpitts oscillator schematic on the > exams in the 50's/early 60's? It was on my General ['54] and Extra > ['56] exams, and practically everyone else I've asked says it was on > theirs too. There are other oscillator circuits of the day. Colpitts > uses capacitive feedback which is somewhat more stable than a Hartley > with its "Tickler Coil," but the FCC seemed fixated on the Colpitts for > some reason. The schematic and operation of a dual-triode 1-shot was > also popular.
They had to pick one of the two, and the rest was inertia. The Second Telegraph exam that I took about 8 years ago had the same questions as the one that you took "back when". Who remembers "transconductance" :) 73 de K2ASP - Phil Kane Elecraft K2/100 s/n 5402 From a Clearing in the Silicon Forest Beaverton (Washington County) Oregon ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
