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MrBungle · 26th Jan 2018, 5:20 pm

I've got 1988 ARRL handbook, W1FB design notebook and Solid State Design for the Radio Amateur here and that's a little sparse on details. A good idea however. I will have a read through some of the material again.

I think you are right with the inductor. The other caps are all NP0/C0G so I wouldn't expect this level of drift. I will try replacing it with a material 6 toroid (T37-6) and a trimmer capacitor and measure stability again.

Worst case, I'm getting a lot of data on Spectrum coils

26th Jan 2018, 5:20 pm	#6
MrBungle Dekatron Join Date: Jun 2016 Location: London, UK. Posts: 3,687	Re: Compensating for VFO drift I've got 1988 ARRL handbook, W1FB design notebook and Solid State Design for the Radio Amateur here and that's a little sparse on details. A good idea however. I will have a read through some of the material again. I think you are right with the inductor. The other caps are all NP0/C0G so I wouldn't expect this level of drift. I will try replacing it with a material 6 toroid (T37-6) and a trimmer capacitor and measure stability again. Worst case, I'm getting a lot of data on Spectrum coils