ARRL

WB2LCW

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Testing RF Choke self resonance with a non-MFJ-259 analyzer! Oct 18th 2012, 16:54 2 2,100 on 19/10/12

Latest Posts

Topic Author Posted On
Testing RF Choke self resonance with a non-MFJ-259 analyzer! WB2LCW on 18/10/12
I wanted to check some Radio Shack RF Chokes for self resonance!
I do not have a MFJ-259B analyzer. But I do have a MFJ-109.
I made a short coax cable with a 50 ohm resistor in series with the aligator clip on the center conductor! i have a short lead on the shield
with another aligator clip. When I test a choke I do see a abrupt drop in SWR, at certain frequencies! I am assuming that these frequency points are where the impedance of the choke has dropped considerably are the frequencies I should avoid if I am to use this choke?

Is my method correct?

73 mike

Back to Top