[Milsurplus] crystal has lost activity?

[WA5CAB at cs.com]

The only failures I have ever encountered in FT-243 holders (other than gross 
external damage) involved mechanical breakage of the contact leads where they 
run down into the pins.  100% repairable if you have the parts.

In a message dated 5/13/2007 11:28:32 PM Central Standard Time, jfor at quik.com 
writes: 
> >Group -
> >
> >Now educate me please.  A crystal is a rock,. that vibrates when
> >electrical stress is applied through metal plates at particular angles
> >to the crystalline grain?
> >
> >I have seen many of these kinds of statements:
> >"After years it is possible that the  crystal has lost activity."
> >
> >To stop a crystal form working would be corrosion forming on the metal
> >plates or loss of conduction to the crystal surface.
> 
> Possibly some fine quarts powder could form on the surface in addition to
> oxidation of the plates.
> 
> >Any of combinations of these conditions could be rectified by cleaning,
> >adjusting contact pressure on crystal surface, repairing conductive
> >path?   So with the correct tools any crystal could be "fixed." to operate?
> >
> >Am I off base?
> >
> >Thanks
> >Hutch
> 
> Any openable crystal  with non-deposited electrodes could likely be
> reactivated. The frequency might be out of tolerance though.
> 

Robert & Susan Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
<wa5cab at cs.com> (Primary email)
<wa5cab at houston.rr.com> (Backup email)
   
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