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Old 7th Oct 2019, 10:24 pm   #16
John_BS
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Join Date: Dec 2008
Location: Wincanton, Somerset, UK.
Posts: 1,757
Default Re: Ferrite rod antenna and RF amp for Valve radios

Yes, a resistor might seem crude, but the only alternative would be to apply negative feedback to the rod, and that starts to get a bit involved. Try about 75 ohms in series with the MF coil to start with.

BTW, I recall reading somewhere that if the LW coil of a MW/LW rod is left open circuit when MW is operating, it's possible for the LW coil to interact as it heads towards self-resonance.

John
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