Thanks for all replies.  I'll try the dummy load thing with some non-
braided cable, like 1/4 inch Heliax jumpers.  On a warm day I'll take 
the 400 down and put the dummy load at the end and try to shake all 
parts of the cable.  I'll bet it's either the strands of the braid 
near the connector wiggling inside or the cable itself presents 
arc'ing characteristics.

I have also noticed this type of reaction to older RG-213.  If the 
braid is discolored to any amount, it will noise up on duplex mode.

I've just about had it with braided cables for *any* type of duplex 
service and am starting to replace all with superflex or heliax 
jumpers and feedline..  

Thanks for all input,
KC4FWC







 
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