Mine was the push-pull triode RF amplifier (not "linear"!), making sure
to show the neutralization circuit. They didn't want any high-powered
self-excited oscillators on the bands!
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 27/04/2020 21:03, 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.
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.
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