[time-nuts] Are there SC-crystals out there in the wild that are not Overtone?

[Bob kb8tq]

Hi

The crystal industry in the US went from a couple of outfits (mostly in PA)  making < 
a hundred a month in the 1930’s,  to a massive bunch of outfits during WWII. Most 
were turning out a couple hundred an hour. 

Much of that collapsed when the war ended and the demand went away. A few outfits
combined with others. The vast majority of companies simply vanished. 

Bob

> On Feb 27, 2020, at 2:07 PM, jimlux <jimlux at earthlink.net> wrote:
> 
> 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)
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.