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

[john]

Hi Don,

I visited Valpey Fisher back in the early 90s, and they were getting 
crystals rough tuned in, using Radio Shack shortwave receivers (DX-160s?) 
to monitor things on a shelf above the lapping stations.

Maybe that lack of process advancement explains the lack of contemporary 
industry in the US these days. (although I see they are still in business).

John K5MO



At 09:26 PM 5/31/2007, Don Buska wrote:


>I wonder how they do this work today. I would think that crystal 
>development has advanced a long way since the days when hams were doing 
>this back in the 40's and 50's.
>
>73