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

To: "RFI List" <rfi@contesting.com>
Subject: Re: [RFI] DirecTV to ground or not to ground
From: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 21 Dec 2008 13:46:42 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
>It is my understanding that the National Electric Code requires that
>your satellite dish be connected to the same ground as your power
>company's and telephone company's grounds and to your ham radio
>station's ground -- all of them tied together.

Receive communications equipment and antenna grounding is covered in NEC 
Sec. 810.  In fact, few licensed amateurs realize that the NEC has a 
sub-section devoted to amateur radio station operations/grounding and is 
included in Sections 810.51 through 810.58 -- and must further comply with 
Secs. 810.11 through 810.15.

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 
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 Tx 
lead-in transmission line conductors are specified to be no smaller than the 
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 NEC 
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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