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eHam Forums => VHF / UHF => Topic started by: W4JST on September 18, 2012, 12:47:59 PM



Title: What is the loss for CATV 75 Ohm hardline?
Post by: W4JST on September 18, 2012, 12:47:59 PM
I have 75 ohm CATV hardline, I believe it's 1/2"?

Does anyone have a loss chart on this? I'd be particularly interested around 150 and 450 MHz.

Thanks.


Title: RE: What is the loss for CATV 75 Ohm hardline?
Post by: WB6BYU on September 18, 2012, 01:02:51 PM
It may be similar to Commscope P3-750 JCA, data for which is loaded into
VK1OD's Transmission Line Loss Calculator here:

http://vk1od.net/calc/tl/tllc.php


Title: RE: What is the loss for CATV 75 Ohm hardline?
Post by: W4JST on September 18, 2012, 04:52:12 PM
Thanks, and by the way I put up a 1/4 wave vertical. 1/2" copper pipe top section with four radials sloping down about 45 degrees or so like the #4 grounding wire or something like that. Thanks for the help with the antenna.