[TenTec] openwire feed OT

[Chas Nagel]

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 ma
 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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