[600MRG] restoring old crystals ??

[Carl]

Grinding or acid etching will raise the frequency.

You still have to clean it first as contamination over the decades lowers 
the frequency andreduces activity. Use 99% pure or better isopropoyl 
alcohol. Then measure the frequency.

Carl



----- Original Message ----- 
From: "John Gibbs" <jgibbs at telus.net>
To: "Neil Klagge" <w0yse.7 at gmail.com>; "SHMRG" <600mrg at w7ekb.com>
Sent: Tuesday, February 05, 2013 5:05 PM
Subject: Re: [600MRG] restoring old crystals ??


>A long time ago I used a cleaner called "Bon Ami" with a bit of water to 
>make a paste which I smeared on a piece of window glass and moved the 
>quartz blank in a figure eight pattern to make the ft-243 xtal higher in 
>frequency..   Also tried tooth paste with not as good results.  A lot of 
>times I wasn't very successful.
>
> A bit of pencil lead on the center of the blank tended to lower the 
> frequency a bit.
> Hydrofluoric acid works too.. but totally dangerous and these days 
> probably not easily obtained.
>
> 73  John / VE7BDQ
>
>
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