[TenTec] openwire feed OT

[Scott Harwood]

Thanks for the trip down memory lane, Chas.  I had such a tuner and it worked great.  The parts are still around.
On a related subject, anyone have any thoughts on the ideal lenght of open wire line to feed a 80 - 10 meter loop to keep RF in the shack to a minimum?
Scott K4VWK
---------- Original Message ----------------------------------
From: Chas Nagel <cnagel at sbcglobal.net>
Reply-To: Discussion of Ten-Tec Equipment <tentec at contesting.com>
Date:  Tue, 31 Jan 2006 14:25:53 -0800 (PST)

>Antenna transmission lines are always a subject of great interest. You already have had some really good answers to your quiry below. In the 50's when I entered into ham radio the OT that was breaking me in constructed for me what was known at the time as an antenna coupler (now known mistakenly as antenna tuner). It consisted of a large 2-gang capacitor mounted with standoff insulators on a box which parallel tuned a coil with a center link installed in the middle. I remember later adding a capacitor in the link. The link was fed by 52 ohm coax from the rig. The coil assembly was plugged into the top. It's hard to explain the physical configuration but you can't buy most of the parts anymore anyway unless you are extremely lucky. Anyway, the balanced open wire line or 300 ohm line was connected to the coil using adjustable clips at optimum equal distances from each end of the coil until a match was obtained in conjunction with tuning the capacitor. I wish I still had that m
 a
> tching
> circuit but I don't think you can find it in any recent ARRL Handbook and the parts are quite scarce. The coupler provided both a means of preserving antenna balance and impedance matching. In those days there were many physical designs some of which even permitted both series and parallel feeder tuning. Just some history for you.
>   
>  Enjoy.
>   
>  Charles K0CW
>
>Paul DeWitte K9OT <k9ot at mhtc.net> wrote:
>  I would like to reopen the discussion on getting open wire into the shack.
>A while back there was quite a discussion on wheather to use a 4-1 or a 1-1
>balun when going to coax from open wire outside the shack and then running
>coax in to a tuner.
>
>No one mentioned just hooking the coax direct to the open wire without a
>balun.
>
>First I realize that you are going from balanced to unbalanced. How would
>this differ from feeding a dipole direct with coax and not using a balun at
>the feed point?
>
>I would like to put up a temporary loop and it is not feasable to run
>openwire in to the shack. But I would like to feed it with open wire from
>the loop to where it comes into the house (cheaper than buying more coax).
>So I am looking for suggestions.
>
>Since I am all T T it is only partly off topic.
>
>Thanks
>
>73 Paul K9OT
>
>
>
>
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