On 2/27/20 8:45 AM, Richard (Rick) Karlquist wrote:
OTOH, you could build a simple Colpitts
oscillator and see where it oscillates.
That's what they did back in the dark
ages.
Any time nut should be up for that.
Rick N6RK
But does a deForest Audion (ref Colpitts patent 1624537 1918) have
enough gain at 5 or 10 MHz?
I guess so, by 1930 deForest was selling oscillators and receivers at
15,000 kilocycles. Although I didn't see any indication of crystal
oscillators - they're all LC tuned. (One mention of crystal control is
in an article about a SW crystal controlled Transmitter by Lester
Spangenberg)
https://www.americanradiohistory.com/Archive-Radio-News/30s/Radio-News-1930-05-R.pdf
(Timenuts - your experience and training probably qualifies you for a
job in Radio-Television - Talking Pictures, see the ads!)
I seem to recall that crystals for frequency control (on a commercial
basis) were sort of a post WW2 thing (partly because of developments in
piezo hydrophones for sonar)
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