[time-nuts] optically excite a quartz crystal?

J. Forster jfor at quikus.com
Mon Apr 21 10:10:34 EDT 2014


No. There is just a little rectangular quartz wafer. No plating.

In fact, post WWII, when many ham transmitters were 'rock bound' (ie:
crystal conteolled) it was common pratice to regrind mil surplus rystals
to move them into the ham banda.

Apparently, some were also etched using a cleanser called Whink, which
contains a flourine compound.

Also, some advocated applying graphite from a pencil lead was used to
decrease the frequency.

If the crystal ativity was low, they were taken appart and cleaned.



-John

==============




> I'm puzzling over this statement.  The FT-243's I have seen have a spring
> that squishes the quartz blank between the electrodes.  They aren't plated
> onto the quartz, but they are still in intimate mechanical and electrical
> contact.
>
> -Chuck Harris
>
> Bob Camp wrote:
>> Hi
>>
>> The WWII era FT-243 is one example of a crystal that has the active
>> portion of the
>> electrodes separated from the resonator by an air gap. There are lots of
>> similar
>> holders from that era that do pretty much the same thing. Non-contacting
>> electrodes are not very new.
>>
>> Bob
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