[Boatanchors] WANTED: FT-243 Crystal for 7160 khz

[Richard Solomon]

There was an article in QST, back when the earth began to cool, that 
used a screw mechanism
to apply pressure to the Xtal that caused it to shift frquency. Touted 
as a Novice VFO (IIRC).

73, Dick, W1KSZ

On 5/13/2013 8:27 PM, Glen Zook wrote:
> The frequency tolerances on FT-243 crystals is not all that good!  Also, by loosening the 3-screws that hold the face-plate on the holder, you can often adjust the frequency.
>
> A number of the "olde tyme" Novice crystal manufacturers listed either 0.01% to 0.03% tolerance for their crystals.  At 7000 kHz 0.01% equals 700 Hz and 0.03% equals 2100 Hz.
>   
> Glen, K9STH
>
>
> Website:  http://k9sth.com
>
>
> ________________________________
>   From: "telegrapher at q.com" <telegrapher at q.com>
> To: Glen Zook <gzook at yahoo.com>
> Cc: boatanchors at mailman.qth.net; Al Klase <ark at ar88.net>
> Sent: Monday, May 13, 2013 9:38 PM
> Subject: Re: [Boatanchors] WANTED:  FT-243 Crystal for 7160 khz
>   
>
> I've got a fist full of 75 and 40 meter xtals here, FT-243 types of course and almost all of them are 200-300 cycles off what the label shows.
>
> Who knows if that's the way they were spit out at the factory or if it is just due to aging?  Close enuff for AM work though.
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