[JMS] How does one "grind a crystal" to change its frequency ?

[Ken & Marie Toliver]

Hello All:
  I also have a number of those old crystals and would be nice to grind some 
of them
and put them back in service.
  Would you please forward a copy of this info to me?

                                            Ken Toliver K0GEI  [JMS] member


----- Original Message ----- 
From: <cwforever at comcast.net>
To: "The James Millen Society Members Email Reflector" 
<james_millen_society at mailman.qth.net>; "The James Millen Society Members 
Email Reflector" <james_millen_society at mailman.qth.net>
Cc: "Sherrill Watkins" <Sherrill.Watkins at dgs.virginia.gov>
Sent: Thursday, May 31, 2007 10:19 AM
Subject: Re: [JMS] How does one "grind a crystal" to change its frequency ?


> Sherrill,
>
> I have an old flysheet from Bliley which describes the proper crystal 
> grinding technique.
>
> I will scan it this evening and email it to you.
>
> Best regards,
>
> de WA1ISA - Peter Dehman
> -------------- Original message -------------- 
> From: "Sherrill Watkins" <Sherrill.Watkins at dgs.virginia.gov>
>
>> Friends and Members of the James Millen Society: Please be advised that 
>> from
>> time to time, I see FT-243 crystals for sale in odd frequencies; i.e. 
>> that
>> are outside of the amateur bands and of no use. Years ago, I heard that 
>> it
>> was possible to "grind" a crystal to raise its frequency. Also, I heard 
>> that
>> one could "rub" a crystal with pensel graphite to lower its frequency. 
>> Yet,
>> I have never seen any article published in any major amateur publication
>> including various handbooks, or magazines such as QST, Electric Radio, 
>> The
>> Old Timers Bulletin, etc. as to how this process is be performed. Can 
>> anyone
>> refer me to a good source or explain the process in great detail? Also, 
>> what
>> is meant by the term, "overtone" crystal? Thank you very much. - Sherrill 
>> W.
>> k4own, member
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