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@sbcglobal.net>
Reply-To: Discussion of Ten-Tec Equipment <tentec@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@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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