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Re: Topband: T Vertical feed

To: topband@contesting.com
Subject: Re: Topband: T Vertical feed
From: Dave Mueller <daven2nl@gmail.com>
Date: Thu, 26 Jan 2012 11:40:54 +1000
List-post: <topband@contesting.com">mailto:topband@contesting.com>
Fil,

My 80/160m antenna is configured identically to yours on 160m.  Same 
dimensions.  In my case, with 90 radials of various lengths, I measured 
an Rr of 16 ohms at the feed point.  The SWR exceeded 2:1 in the shack.

I use a hairpin coil recommended by K2KW (Team Vertical) to bring the 
impedance up to 50 ohms.  Approximately 6 turns on a 10cm form between 
the feed point and ground does the trick nicely.  Adjust turn spacing 
for minimum SWR.

73, Dave KH2/N2NL (/KH6 at the moment)


On 1/26/2012 5:27 AM, ct1ilt@sapo.pt wrote:
> Hi Everyone,
>
> just finishing puting up a T Vertical (exactly in T shape) using 2
> supports at the ends.
>
> The vertical portion is 18m and the T is 17m to each side (34m total).
>
> I am laying radials from 20m - 40m (have about 20 right now).
>
> My question is regarding the feeding of the antenna, should it be
> straight with 50 Ohm cable? Should I make some impedance transformer?
> (I have FT240-61) that I could use.
>
> Thanks for help, getting ready here for CQ WW cw 160M.
>
> 73's Filipe CT1ILT aka CR6K
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK

_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK

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