OT: The Colpitts mystery

Posted by k6dgw on Apr 27, 2020; 6:03pm
URL: http://elecraft.85.s1.nabble.com/Voltage-drop-in-DX-Power-to-K3-tp7660188p7660247.html

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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