Maxwell House RF Choke
A new, highly effective RF-Choke!
Recent ARRL Lab tests determined coffeen to be an excellent impedance to Common Mode Current.
When building this choke, do not use Cafeen-Free coffee.
It was also found that 100% Arabian Coffee produced significantly more Common Mode Impecance (CMI) than South American Coffee.
To determine the number of turns of coax, use the following formula:
This new design is especially recommended for Beverage Antennas.
(Your mileage may vary.)