Re: Measuring Resonant Frequency
No, one set of coils is enough, diameter is no matter as long as it is in say 20-80mm and frequency is low enough to prevent them being good radiators.
the coils will act as a mini loop antennas both transmitting and receiving, luckily not very good transmitter antennas at 7MHz which is as we want.
with high Q tanks I have had to use above 250mm to any of the loops as they where noticably increasing bandwith otherwise (loading the tank down)
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