[Elecraft] Balun question

[Vic Rosenthal]

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