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Old 21st Dec 2022, 1:56 am   #37
Bazz4CQJ
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Join Date: Apr 2009
Location: Oxfordshire, UK.
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Default Re: Quick question on the CODAR AT5, if anyone has one to hand.

Quote:
Originally Posted by frsimen View Post
I hope your AT5 clones don't drift as much as my real one does!

Paula
Is that thermal drift? C1 and L1 will probably have large positive tempco. Looking at the parts list C3 & 4 are just listed as 270pF. If those are not already polystyrene caps (i.e. negative tempco), then making them so might improve thermal stability. C5 is listed as 10-40pF "temp.comp". Is that one of the Oxley temperature trimmers? Wonder what it is if not?

B
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