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[TowerTalk] re Feeding a long distance array

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Subject: [TowerTalk] re Feeding a long distance array
From: " Peter Forbes" <>
Date: Tue, 18 Nov 2008 07:03:56 +1100
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If you can use a heliax type of cable, you are looking at about 0.17 dB per 
100 feet of loss (not counting the connectors), so 400 feet  (300 + 80 + 
shack end) will be about 0.7 dB, which will hardly be noticed.

Even the venerable RG8 foam will only be about 1.8 dB loss over that 
distance, scarcely noticeable on transmit and zero effect on receive against 
the normal terrestial noise background at 7 Mhz.

My concern would be with the rotator cable which may need beefing up, 
depending on whether it is a DC or AC type of motor and its current/voltage 
requirements to function correctly.

Good luck with the project.

Peter   VK3QI

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