[Top] [All Lists]

Re: [TenTec] Re. [Ten Tec] Grounds and balanced fed verticals

To: tentec@contesting.com
Subject: Re: [TenTec] Re. [Ten Tec] Grounds and balanced fed verticals
From: Jim Brown <k9yc@audiosystemsgroup.com>
Reply-to: k9yc@arrl.net, Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 25 Jan 2012 16:28:46 -0800
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
On 1/25/2012 3:09 PM, Stuart Rohre wrote:
> Les Moxon. in his RSGB England book, "HF Antennas for all Locations"
> shows ladder line fed quarter wave verticals as you describe.

BALANCE is defined by equal impedances from each side of the circuit to 
the reference plane (in this case, the earth).  The feedline is only one 
part of that circuit, and using twin lead does NOT provide balance if 
the ANTENNA is not balanced and the antenna tuner is not balanced.  A 
vertical antenna is NOT balanced.

The primary virtue of using higher impedance feedlines has NOTHING to do 
with balance, but rather that their higher impedance reduces losses if 
the system is matched. But twinleads are just as likely to carry common 
mode currents and couple them to the antenna if they are not very 
effectively choked.

73, Jim K9YC
TenTec mailing list

<Prev in Thread] Current Thread [Next in Thread>