Locating RF Interference at HF
QST® – Devoted entirely to Amateur Radio www.arrl.org November 2014 35 where F is frequency (Hz), L is inductance (H) and C is capacitance (F), we find that the loop can tune from 40 through 10 meters. You may need to make the loop slightly larger than 20 inches to cover the lower part of 40 meters.
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