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|Testing RF Choke self resonance with a non-MFJ-259 analyzer!||Oct 18th 2012, 16:54||2||1,909||on 19/10/12|
|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?