[TowerTalk] 75 ohm cable power handling ?

Jim Brown jim at audiosystemsgroup.com
Sat Jan 6 05:09:28 EST 2018

On 1/6/2018 1:41 AM, Martin Sole wrote:
> Anyone have an idea of the 30MHz power handling capability for RG6A/U 
> and Belden 9104?

RG-numbers are essentially meaningless -- the tell us nothing more than 
approximate size and Zo. The Belden data sheet


tells us that 9104 is a CATV cable, CCS center, shield is Al braid and 
Al foil. Your guess is as good as mine for power handling. It's designed 
for low power CATV systems where the signals are mostly UHF. It tells us 
that DCR (resistance at DC) of the center is 4.45 ohms/100 ft, and 1.2 
ohms for the shield. These values will increase (a lot) with frequency.

My WAG (Wild Assed Guess) is that these cables will be OK for 100W into 
matched loads, but I'd be cautious with high power or poorly matched 
loads. And remember -- the match that matters is that between the 
antenna and the line.

73, Jim K9YC

73, Jim K9YC

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