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

[mac]

I've got one f these.  Have never been able to get the frequency  
variation indicated by the "callibration" markings on the top cover.   
Believe frequency shifts observed with this scheme are primarily due  
to varying the holder capacitance as opposed to pressure changes on  
the xtal wafer.

Dennis D.  W7QHO
Glendale, CA

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On May 14, 2013, at 8:17 AM, Dave Merrill wrote:

> Here"s one from Bliley:
>
> http://www.bliley.net/XTAL/docs/ads/VF1_in_QST_Ad.jpg
>
>
> On Tue, May 14, 2013 at 10:04 AM, Glen Zook <gzook at yahoo.com> wrote:
>
>> There were a number of commercially available crystals that had a  
>> machine
>> screw and a knob through the cover of the holder.  By varying the  
>> pressure
>> on the crystal one could change the frequency.  Depending on the  
>> actual
>> crystal, as much as 2 or 3 kHz (at the fundamental) could be covered.
> ______________________________________________________________