[TowerTalk] re coax jumpers help

[Jim Lux]

At 12:22 PM 10/20/2006, wa3afs at inav.net wrote:
>I have been running 600-700 watts into RG8X regularly for many 
>years.  160M-10M.  My coax runs now exceed 150
>feet to my phased 160M verticals and 40M 4-square.  Never had a 
>problem with the power handling in the RG8X.
>(It should be noted that I operate my antennas with low SWRs.)


And this would match with the mfrs data (which is probably a bit 
conservative)... The loss will go down as the square root of 
frequency, so at 2 MHz, it's less than half the dissipation for the 
10MHz number, so the power rating would be roughly doubled.

not only that, but presumably you're not running RTTY or FM at 700 W 
with 100% duty cycle.  CW is probably around 50% Duty Factor, 
doubling the rating again.  Kind of depends on the thermal time 
constants, but that's a much more complex calculation.

Jim