[RFI] Question about common mode noise

[Bob WA2SQQ]

I’m
I’m seeing what appears to be wide band possibly common mode noise on 160
thru 40m.
A friend of mine suggested
1 Dosconnect the antenna to verify no noise and no S meter indication.
2 Connect the antenna and tune to a portion of each band with no signals
3 Partially disconnect the antenna leaving only the center of the pl259
connected.
4 Compare the noise with shield of coax connected and disconnected.

He swears that if the noise increases when the shield is connected, that’s
a positive indication you have an abundance of common mode noise.

I’m not so sure this is a valid test. Comments?





*Best 73 de WA2SQQElmwood Park, NJ"The only dumb questions are those we
don't ask"*