----- Original Message -----
From: "david knepper" <[EMAIL PROTECTED]>
To: "Ben Dover" <[EMAIL PROTECTED]>; "Discussion of AM Radio in the
Amateur Service" <[email protected]>
Sent: Wednesday, November 14, 2007 8:13 AM
Subject: Re: [AMRadio] Open Wire - was AMRadio Digest, Vol 46, Issue 24
Here at the Collins Radio Center/Museum, one of our many antennas is a
Zepp fed with 600 ohm open line. The antenna is 244 feet long and works
extremely well over the 80 meter and 40 meter dipoles. The antenna is 1/2
wave on 160, a full wave on 80 meters and multiple wavelengs on 40 meters.
It is a great to have this capability both in gain and feed line loss.
Real radio operators use open wire feedline.
Correction. Real radio operators use whatever works for them for what they
want to accomplish. Real radio operators do not blindly follow one single
path.
With so many antenna modeling programs available today it is nice to know
what a particular antenna will really do. Subjective comments without
supporting analysis are simply one persons opinion.
BTW, one open line antenna that gets very little mention simply because it
has never appeared in an ARRL publication is the "Folded Top Dual Band"
which is in the Radio Handbook from the 40's into at least the 70's when
interest in open line died (and before the current revival). It can be
scaled for any 2 adjacent bands. Those books also contain other antennas
that you will never see in an ARRL pub.
I may even put one of those FTDB's up since I can balun feed outside and run
coax into the house. Have to run it on Eznec first.
Carl
KM1H
Dave, W3ST - W3CRA
Collins Radio Association
www.collinsra.com
Join the largest Collins group in the world
Nets on 7208 at 4:30 EDST every day and
Monday at 3805 at 8 PM EDST
----- Original Message -----
From: "Ben Dover" <[EMAIL PROTECTED]>
To: "Discussion of AM Radio in the Amateur Service"
<[email protected]>; <[email protected]>
Sent: Wednesday, November 14, 2007 8:05 AM
Subject: Re: [AMRadio] Open Wire - was AMRadio Digest, Vol 46, Issue 24
-----Original Message-----
From: KX5KW <[EMAIL PROTECTED]>
Sent: Nov 13, 2007 6:42 PM
To: [email protected]
Subject: Re: [AMRadio] Open Wire - was AMRadio Digest, Vol 46, Issue 24
I expect that many of us that are able to get something else in the
air, choose balanced-open-wire for it's advantages over coax cable.
A link-coupled balanced tuner feeding open-wire line can be a very
simple, efficient setup. Don't dismiss it just because it has been
around for a long time. :)
73',
Kent/KX5KW
For my money, the ONLY advantage coax has over open wire feeders is
convenience.
You don't have to build coax, it doesn't demand the ingenuity and
attention to detail in installation that open wire does, and you can
just poke RG-213 thru a hole in the shack wall to get it to the rig!
On the other hand... open wire can be constructed for a fraction of the
cost of the same length of coax. You can get away with using an antenna
on a larger slice of the band with open wire and a tuner, due to the fact
that open wire's MUCH smaller losses allow it to be safely run at a much
higher VSWR than coax. If you design your home made open wire carefully,
it's weight is far less than a comparable run of coax, and that's a major
stress consideration when you're feeding an end supported dipole.
I personally love the stuff. Coax has it's place, but often it's not the
best solution to the problem.
Mr. T., W9LBB
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______________________________________________________________
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List Rules (must read!): http://w5ami.net/amradiofaq.html
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Help: http://mailman.qth.net/mmfaq.html
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