Heterodyne Crystal Failures Mode?

[Kenneth G. Gordon]

On 20 Jul 2006 at 21:32, Jim Flanagan wrote:

> Hey guys..
> I noticed that the Het Osc crystals seem to fail fairly often in the
> HW101. This appears particularly true for the upper 10 meter band
> crystals.  Has there ever been a technical evaluation as to why this
> seems to be the case?  I was curious if anyone has attempted to remove
> the outer case of these bad crystals and resolve the problem.  Of
> course, if the actual quartz material has been broken due to
> shock,etc, then that is one thing.

I've noticed the same thing, but have not been able to take the time to 
investigate further.

Perhaps it has to do with the fact that those are overtone crystals, and 
there is a manufacturing problem.

Further investigation is required.

Ken Gordon W7EKB

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