[TowerTalk] Towers and Open Wire Feeders

Richard (Rick) Karlquist richard at karlquist.com
Fri Feb 2 12:47:48 EST 2007

We use 50 ohm unbalanced to 450 ohm balanced transformers
at the ends of our 450 ohm open wire line (about 250 meters long).
Then the radio and antenna use short lengths of standard 50 ohm coax.
We run the system at a low SWR.

Rick N6RK

> I have been conducting a few experiments using open wire feeders 
> to monoband Yagi's. So far things are looking very good. (I do 
> not want to use Co Ax feeders due to the very long cable runs 
> (and associated loss) at my QTH. Typically 350 metres).
> The next step is to run the open wire feeder around the Rotator 
> unit. I would like to keep Open Wire feeder as the only feeder 
> from the shack to the Yagi, but recognise I may have to change 
> this requirement. For example feeding Open Wire feeder into the 
> shack, although electrically efficient, would create practical 
> issues in terms of cable management. So I may use 1:1 Baluns at 
> the shack end and feed short CoAx runs into the shack. I am using 
> tuned lengths of feeder so the impedance presented by the antenna 
> to the feeder is the same impedance at the shack end ).
> So, thats some back ground. How do I run Open Wire Feeders around 
> a Rotator ?
> All comments appreciated.
> Thanks
> Adrian Rees MW1LCR 
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