[BC] Power handling of 1 5/8 foam coax.

[PeterH5322]

>>Can 1 5/8 foam coax handle 50 kW at 125% + AM modulation? The frequency
>>involved is 880 kHz.??If so, what is the safety margin?
>
>LDF7-50A is rated by Andrew with a 315kW peak power maximum.? The power 
>max for 50kW carrier at 125% modulation is a little over 250kW; not a lot 
>of safety margin, but, at least in theory, it will take it, at least 
>temporarily.? The average power rating is 30.9kW according to Andrew 
>catalog 38.? The next size up (and the largest LDF cable) is 2-1/4; it has 
>a continuous average rating of 39.8kW and a peak of 425kW.? To get the 
>safety you need and want you need to go to air dieletric 3 inch, which has 
>an average power rating of 81.9kW.

1-5/8" line is just barely adequate for the highest-powered tower in 
KRVN's night array (Tower #3, with about 30,500 watts going into it), but 
1-5/8" line is not adequate for this station's ND-D mode, for which 3" 
line would, indeed, be required.