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Re: [TenTec] SLIGHTLY OT

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] SLIGHTLY OT
From: Steve Hunt <steve@karinya.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 08 Apr 2011 22:11:51 +0100
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Mike,

You're putting words in my mouth - I've not said anything about whether 
an antenna is "half decent" or not.

What I can tell you for sure is that a 132ft dipole at 50ft above 
average ground will have a feedpoint impedance of around 10-j1059 Ohms 
at 1.9MHz; and that load will result in 6.5dB loss in 100ft of Wireman 
551 if it's dry, and 9dB if it's wet. I leave you to judge whether or 
not that constitutes a "half decent" antenna for that band.

Why are the losses so high? Because that feedpoint impedance produces a 
VSWR of 320:1 on the 400 Ohm 551 ladderline.

73,
Steve G3TXQ



On 08/04/2011 21:56, Mike Bryce wrote:
> Okay...
>
> So what I just read from the link you sent, if I take and put up a center fed 
> Zepp with 66 feet on each side, fed with 450 open line and assume no loss 
> from the tuner or balun that antenna won't make a even halfway decent 
> multiband antenna?
>
>
> Mike
>
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