Frank .. all crystals change frequency with age. The change should be 
less and less with time and in the same direction, until it settles 
down. I would say that what you are seeing is quite normal. If you want 
to worry about something consider if the air filter catching enough 
dust! The real question is, is your SDR-1000 on frequency after 
calibration?

--Larry W8ER

Frank Mayer wrote:
> I have had my SDR-1000 since December.  When I first got the clock offset was 
> set to about +100 for accurate calibration.  Since then it has been steadily 
> needed to be reset to a lower value.  It is at -1300 now.  Could the problem 
> be the crystal going bad?
> Frank  WA3JBT.
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