So you have a doublet (which apparently is a dipole fed with ladder line)
resonant on 80m and a dipole resonant on 40m. I would expect that the 40m
dipole would be more efficient on 40m and hear more noise as well as more
signals.
John KK9A
To: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>, TowerTalk
<towertalk@contesting.com>
Subject: [TowerTalk] Temporary Coax on the ground
From: dw <bw_dw@fastmail.fm>
Date: Thu, 28 Jan 2016 13:13:05 -0800
I have two wire antennas.
One is a classic 135' doublet up 55' favoring E/W
The other is a 40m dipole I put up last fall which is slightly
North-West facing.. for working JA(s) on grey-line.
Since the 40m Dipole was a "throw-up" I simply left the 100 feet of
RG-213 lying on the ground going to it.
Both wire antenna are fed with external L-Networks and ladder-line.
I've noticed the doublet is much quieter on 40 than the dipole.
And I don't know why.
Could be the dipole has that 100 feet of coax laying on the surface of
the ground picking up noise.
while most of the 30 feet of coax feeding the doublet is under ground.
Could be simply the difference in 30' vs 100' of coax.
--
Bw_dw@fastmail.net
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