, WD2XSH/45
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Message: 25
Date: Sun, 19 Dec 2010 16:21:27 -0800
From: Lew Phelps K6LMP k6...@me.com
Subject: [Elecraft] Semi OT: vertical wire antennas
To: Elecraft Reflector elecraft@mailman.qth.net
Message-ID: e211a6c0-079d-4232-9ac3-76db6af74...@me.com
Content-Type: text
Lots of good advice has been given here. The SWR-related coax losses on
60-10 meters will be negligable with decent coax (I use 1/2 Heliax, but
LMR-400 is almost as good), especially with your short run. I use my K3
internal tuner for these bands. For 160- and 80-meters, I have a
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Semi OT: vertical wire antennas
Lots of good advice has been given here. The SWR-related coax losses on
60-10 meters will be negligable with decent coax (I use 1/2 Heliax, but
LMR-400 is almost as good), especially with your short run. I use my K3
If you have the kind of dirt I have here in the Sonoran Desert, I contend that
the worst horizontal wire you can put up will be better than the best 43'
vertical you can use.
As long as we're using anecdotal evidence, check my call in the ZL8X log. I
missed them on 10-meter RTTY. Except for
I'm currently running my K3-10 into a 40 meter horizontal loop antenna, mounted
on my roof about 35 feet above ground. It's impractical to use on 80, and has a
very high angle of radiation on 40 and 20 meters.
So, I'm thinking of replacing it with a 43' wire vertical. Yes, I know it needs
a
Lew, I've had considerable experience here with a 43 ft wire vertical. The
bottom line is that your proposed layout will work, and will be
SIGNIFICANTLY better on 20, 30, 40 and 80 than your loop if your interest is
in working DX. I use a remote tuner at the base of mine (CG-3000), but the
Lew, the biggest difference between wire and tubing is the size of the
conductor. Thin conductors have higher Q and so narrower bandwidth,
necessitating somewhat more retuning as you move about the band.
Many tests have shown that 1/8 wave radials - about 32 feet on 80 meters -
work FB. In the
Lew, no doubt you'll get a lot of good advice from other hams here and
elsewhere. However, there is no source for vertical antenna info that can
compare with John DeVoldere's book Low Band DXing. Highest possible
recommendation. That, plus a copy of EZNEC, and you too can be an antenna
guru.
BTW
See interspersed.
On Sun, Dec 19, 2010 at 7:21 PM, Lew Phelps K6LMP k6...@me.com wrote:
I'm currently running my K3-10 into a 40 meter horizontal loop antenna,
mounted on my roof about 35 feet above ground. It's impractical to use on 80,
and has a very high angle of radiation on 40 and 20
the
vertical another 20 feet or so above the tree. This worked for me.
73 N7RT
- Original Message -
From: Guy Olinger K2AV olin...@bellsouth.net
To: Lew Phelps K6LMP k6...@me.com; Elecraft Reflector
elecraft@mailman.qth.net
Sent: Sunday, December 19, 2010 6:18 PM
Subject: Re: [Elecraft] Semi OT
1. A wire should be as good as tubing.
2. Use at least 16 radials 30' long. You won't get much if any improvement by
making them
longer and zig-zaging. Probably 32 would be a little better, but it's not worth
it to use
more.
3. Do NOT put it against the trunk! The farther away from the tree
I seen an article somewhere on how to tap into a tree and load it up.
Wonder what this looks like on a antenna modeling program. Any way get that
wire up and you will make many contacts. I use a 43' vertical at my campsite
with the K1 and no radials. Some times I use the trailer for a
Thanks to the many Elecrafters who have given thoughtful, knowledgeable and
thorough replies to my questions. Collectively, you have answered all three of
my questions, and also proposed an alternative that I hadn't considered: the
inverted L.
I failed to mention that the distance from my
I can't speak to the losses in the LMR-400 cable under very high SWR, but
for the record my Inverted L brings the single wire into the tuner in the
shack. I use a 1/4 acrylic tubing as an insulator to bring it through the
outer wall into the shack.
Good luck and have fun Lew!
73,
Ron AC7AC
When I moved the feed for my inverted L antenna from my shack to a
post set 100 feet from the shack, the noise level on receive improved
by about 3 S units. I use an SGC tuner on the post and run the coax
and power cable in an underground conduit to the shack. The radials
are hard to
I will give you one more perspective Lew. I run an inverted L for 80/160 which
is suspended at the top about 60 feet high from my tower. The wire is about 10
feet from the tower at the ground and maybe 3 feet at the top. I use 12 gauge
insulated wire and at 60 feet from the ground I have a
Lew
Have a look at this simple project. I'm about to build one and support it
with a fishing rod, but your tree will do a good job. Lots of advice in the
article. I've also modelled it at twice the size to cover 160 and it looks
very interesting. It's close to resonant on several bands and
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