Dick-
Sure, because the open wire has very low loss. The 10dB you lose operating
the 40M dipole on 20M is mostly heat warming up the dielectric of the coax
as the signal reflects back and forth on the mismatched frequencies.
I have used an 80M wire dipole for years fed via open wire line and a tuner.
It has worked very well on all bands. I even use it on 160M by shorting the
open wire together at the bottom and using it as a top-loaded vertical!
One caution: I use true open-wire, which is bare wire with a small
insulator every 2 feet or so. Ladder-line is sometimes sold as "open-wire"
but the additional dielectric webbing increases the losses somewhat.
73,
Steve
N6SJ
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Dick
NY1E
Sent: Tuesday, January 31, 2017 3:51 PM
To: towertalk@contesting.com
Subject: [TowerTalk] 40-10 meter wire antenna
I'm in a limited space location, I'm looking for a wire antenna to use on
40-10 meters. The handbook says a 40m dipole fed with ladder line will be 2
half waves in phase on 20, and have 1.8 db gain. My coax fed 20m dipole is
10db better than my coax fed 40m dipole on 20, will open wire feeders and a
tuner really improve it that much?de Dick NY1E
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