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Re: [RFI] DirecTV to ground or not to ground

To: "Paul Christensen" <w9ac@arrl.net>, "RFI List" <rfi@contesting.com>
Subject: Re: [RFI] DirecTV to ground or not to ground
From: "Cortland Richmond" <ka5s@earthlink.net>
Reply-to: ka5s@earthlink.net
Date: Sun, 21 Dec 2008 15:30:17 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>

It looks as if the NEC is here concerned not with electrical
characteristics, but with mechanical ones.


> [Original Message]
> From: Paul Christensen <w9ac@arrl.net>
> To: RFI List <rfi@contesting.com>
> Date: 12/21/2008 1:46:42 PM
> Subject: Re: [RFI] DirecTV to ground or not to ground

> Under NEC 810.52, the AWG size for outdoor Tx/Rx antennas is even 
> considered:  For dipoles and other wire antennas, Table 810.52 specifies 
> that
> for antenna spans less than 150 ft (45m), conductors shall not be smaller 
> than #14 AWG.  Over 150 ft, (e.g., 160m dipole) requires either #10 
> (hard-drawn CU), or #12 (copper-cladded steel). Further, the diameter of
> lead-in transmission line conductors are specified to be no smaller than
> antenna conductor size.  So, according to the NEC, a U.S. station may not 
> use #16 AWG ladder line with #14 AWG wire antennas.  In no event should 
> ladder/open line be less than #14 AWG.
> Reality check:  So just how many of us are actually complying with the
> when we install our wire antennas?  Odds are it was pure luck if your 
> installation falls within the NEC requirement.
> Paul, W9AC 

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