Towertalk
[Top] [All Lists]

Re: [TowerTalk] 450 ohm feedline and coax

To: towertalk@contesting.com
Subject: Re: [TowerTalk] 450 ohm feedline and coax
From: Jim Lux <jimlux@earthlink.net>
Date: Tue, 23 Dec 2014 11:39:47 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 12/23/14 11:12 AM, Ken wrote:
You are right, Jim, wider spacing is REQUIRED.   From the ARRL Antenna Book:

“The line should be kept away from other conductors including downspouts, metal window 
frames, flashing, etc. by a distance of two to three times the line spacing.”



The challenge is that there's not a lot of analytical backup in the handbook (not that there should be) for that statement. "how much worse is it at 2 than at 3"?

I think, though, that at 3 x spacing (based on the algebra in my previous post), you're definitely down in the <1% kind of effect.




_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
<Prev in Thread] Current Thread [Next in Thread>