Hi Terry, 

Pretty much any coax, which moves will cause some noise, even 
hard line.  Some of the problem is related to the shielding 
value, the dilectric and conductor material, amount of 
movement, type of termination (antenna & equipment at both 
ends of the line), weather, nearby and distant objects...
yadda, yadda, yadda (not the Food Network "Giada" - pronounced 
similar to "yadda") 

I don't like or use LMR Feed line in new installs, I've had 
summer heat kill a new install in 3 months. The noise issue 
is not exclusive to LMR feed lines, but it seems to get a 
serious amount of credit when using said line. "Real 1/2" 
hardline is not really that much more money and seems to be 
really cheap on ebay if you search around. 

You could put a termination (dummy load) in place of the 
antenna to test for static buildup as mentioned by others 
here in the group. 

You didn't say what type of antenna you're using. 
I would first lean toward dealing with the antenna first 
if it's a fiberglass unit.  Even in the current wet weather 
we're having on the West Coast, one of the fiberglass antennas 
I have on a system pops like crazy when it's windy. We 
plan to change the antenna out for a dipole array if 
the rain would ever quit. 


> "One of our local repeaters has a popping noise that gets severe
> during high wind conditions.  I have "heard" that LMR type coax can
> cause this noise. Various reasons have been discussed including the
> dis- similar metels between the inner and outer shield, also nicking
> the copper clad on the center conductor.  I am told this condition
> only occurs on a repeater using the same coax for Rx and Tx. The
> repeater in question has a very clear signal when transmitting, the
> noise only comes on while receiving a signal, both with and without
> modulation.  This leads me to susspect the "dis-similar metals" theory."
> I'd appreciate any insight you may have on the question, preferably
> directly to me
> Thanks in advance
> Terry
> WX7S

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