[TowerTalk] Open wire line convert

[Dave D'Epagnier]

After reading Wes's web page and article, I don't think he is indicating
that open wire feeders are always inferior to coax. He is merely stating
that the plastic insulated types don't perform well when wet and that under
some conditions baluns and tuners in the system can end up eating a lot of
power which is often overlooked. There are some conditions where none of
these problems exist. I have a friend who has a 40m bi-square (roughly 1200
-j1200 ohm input impedance) centered at 100' in height with a home brewed
open wire feeder with air dielectric. He uses a (balanced) Johnson Matchbox
between it and his amplifier. This combination performs fine under wet
conditions and is easier to match than a 50 ohm feeder with this antenna,
and has less loss (although probably negligible at 7.15Mhz).

Dave
K0QE


> -----Original Message-----
> From:	w0hh [SMTP:w0hh@msn.com]
> Sent:	Tuesday, September 19, 2000 5:47 AM
> To:	towertalk@contesting.com; n7ws@azstarnet.com
> Subject:	Re: [TowerTalk] Open wire line convert
> 
> 
> Thanks Wes, for revealing the ugly truth about "open wire" feeders. I
> always
> thought this stuff belonged back in the 1930's. And I thought it had died
> a
> well deserved death right after WW2, when coax became widely available,
> and
> most rational people switched over. I don't think you can beat a good
> quality coax cable, especially if a good performing tuner is used, when
> needed. These modern tuners, such as my ATR-30, sure are hard to beat.
>  73 Tom W0HH
> 
> 
> 
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