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

[Lamar Owen]

Dana  Puopolo wrote: 

>Okay brain trust....I'm in Nebraska and have a question...

>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.
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Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC? 28772
828-862-5554
www.pari.edu