[time-nuts] optically excite a quartz crystal?
cfharris at erols.com
Mon Apr 21 11:08:44 EDT 2014
Who said they were plated?
J. Forster wrote:
> 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.
>> 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
>> -Chuck Harris
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