It was on the 2nd phone as well! Not sure if it was one I had to draw or just identify.
My recollection is that the 2nd phone was much much harder than the present Extra. My commercial licenses were 1959. My Ham license is 2007. 73 George AI4VZ -----Original Message----- From: Fred Jensen Sent: Monday, April 27, 2020 2:03 PM To: [email protected] Subject: [Elecraft] OT: The Colpitts mystery 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. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 4/26/2020 7:28 PM, N4ZR wrote: > As for the licensing tests, did you have to draw a Colpitts > oscillator? IIRC, that was on my General exam in 1955. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
