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Old 28th Oct 2022, 7:26 pm   #30
Bazz4CQJ
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Join Date: Apr 2009
Location: Oxfordshire, UK.
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Default Re: Improving Selectivity In Vintage Receivers

OK, have taken measurements of both R and and L on the windings of my coil.
The values of R add up within reasonable error, but I don't quite understand the L values; adding up the two segments does not give the inductance of the whole. See attached. It looks as though my allocation of green and red is wrong, wrt to real "hot and cold".

Perhaps I should add that L was measured at 10kHz, if I change to 100Hz, all the reading increase by 2-3%.
Is there some subtle reason I'm missing?

B
Attached Files
File Type: pdf HRO Xtal Filter coil.pdf (35.8 KB, 40 views)
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Last edited by Bazz4CQJ; 28th Oct 2022 at 7:48 pm.
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