Heterodyne Crystal Failures Mode?

[Garey Barrell]

Kenneth G. Gordon wrote:
> 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
>
>   
Or perhaps the oscillator is marginal (gain/frequency)?

73, Garey - K4OAH
Atlanta

Drake 2-B, 4-B & C-Line Service CDs
<http://www.k4oah.com>

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