[Drakelist] So if crystals change frequency ...

[Arthur Delibert]

...what about crystal filters?  We're all using crystal filters in our rigs 
that are as old as the crystals that we're talking about replacing.  Do the 
crystals in the filters also drift over time, shifting the passband (or 
distorting it, if the crystals in it don't all drift at the same rate)?  Is the 
drift just too small to worry about in the case of a filter?
 
Thanks for any insights.
 
Art Delibert
KB3FJO                                    
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