W3FPR - Don Wilhelm wrote:
If my calculations are correct, YES you should have a good balun. The
reactance of the 9 turns is 809 ohms (AL value is 884 mH/1000 turns,
inductance for 9 turns should be 71.6 uH) which is more than 16 times the
impedance of an antenna feedline of 50 ohms. Greater than 10 times the line
impedance is the value I usually use for an effective chokeing action.
I connected the wires on either end together and tried to measure the
common-mode impedance. It exceeded the range of the MFJ meter (650 ohms). So I
guess that theory agrees with practice!
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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