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Re: [TowerTalk] G5RV vs 40M dipole

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] G5RV vs 40M dipole
From: <john@kk9a.com>
Date: Sun, 26 Apr 2015 18:52:51 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
W8JI's on the air tests were done on 80m where I believe the G5RV is
basically omnidirectional. On higher frequencies the antenna has some deep
nulls which could greatly affect the signal strength.

John KK9A

Re: [TowerTalk] G5RV vs 40M dipole
from [Steve Hunt]       [Permanent Link][Original]
Subject:        Re: [TowerTalk] G5RV vs 40M dipole
From:   Steve Hunt <steve@karinya.net>
Date:   Sun, 26 Apr 2015 18:58:16 +0100

If you use a G5RV, the simplest way to get improved signal strength reports
is to announce that you are using something else ;)

This from W8JI:

----------------------------------------------------------------------------
-------------------------------------------------------------------


   On The Air Testing

One of the only ways to reliably test an HF antenna is a blind A-B
comparison against another known good reference antenna. Since I also had a
dipole at 100 feet a few hundred feet away from the G5RV (similar height), I
had an ideal testing situation.


     Blind Test

I checked into various groups on 75 meters and did a blind A B antenna test.
I would say "this is antenna one one one, this is antenna two two two" while
switching antennas. The results were:

1. Nearly ALL of the reports indicated NO difference in signals! (58
   equal reports)
2. When a difference in signal was reported, about equally split either
   the full size dipole or G5RV would win. (7 G5RV better, 9 dipole
   better)


     Announced Tests

I also did tests that called the antennas by name. I would say "This is the
the G5RV,G5RV, G5RV. This is the dipole, dipole, dipole". The results were
rather revealing.

1. When I would call each antenna by the correct name, the G5RV was
   reported "weaker" or with "poorer audio" or some other negative
   comment more than 80% of the time. The remaining stations reported
   no difference!
2. When I would call each antenna by the /*opposite name*/, the antenna
   I was calling the G5RV was /*still reported*/ in some negative
   context about 80% of the time. The remaining percentage again
   reported no real difference.

----------------------------------------------------------------------------
-------------------------------------------------------------

Full story on Tom's web site:
http://www.w8ji.com/g5rv_facts.htm

Steve G3TXQ

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