[TowerTalk] antenna choices for K4XS

[john at kk9a.com]

I believe that the triband report was done as accurately as possible and
the antennas were assembled per the manufacture's instructions.  I am sure
that they would have been sued if it was not a fair evaluation.

I have never owned a Mosley but I recall reading that they use some unique
feeding method and it is the reason that no choke is required.  Is this
correct?

John KK9A



To:	"TowerTalk at contesting.com" <TowerTalk at contesting.com>
Subject:	Re: [TowerTalk] antenna choices for K4XS
From:	Stan Stockton <wa5rtg at gmail.com>
Date:	Mon, 13 Apr 2015 07:10:49 -0500

It is worth reading the post with full text below from N0AX, one of the
report
authors, from a year and a half ago written during another round of opinions
regarding Mosley antennas.

I've read all these posts and have a few observations.  I don't own a
commercial antenna and don't plan to buy one anytime soon.  I'll stop
short of
calling it bashing but will say that it appears there is a lot of unfair bias
in regards to Mosley.

W4TV wrote:

>K7LXC and N0AX published two widely respected *scientific* studies
>of tribander performance using validated measurement techniques to
>directly compare the performance of the tested antennas against a
>standard (dipole).

N0AX wrote:

>The main issue with the Mosley PRO antennas we tested was on 10 meters
>where gain and pattern were definitely below spec.  It is quite possible
>that the manual's instruction not to use a balun at the feed point
>allowed significant feed line interaction to the point of upsetting the
>radiation pattern.  All other antennas did use a ferrite bead balun made
>by Force 12.  We did not test the Mosleys with and without a balun -
>there wasn't enough time and energy.

And VE7RF wrote:

##  Oh this just cracks me right up !   Megabuck Mosley PRO 57 / 77
has essentially no gain on any band.
The kicker is.... the PRO-57/77 has LESS  gain on 10m  vs the paltry
TA-33 !!!     WTF ?

##  I mean..come on folks.   LESS than 1 db gain on 20M.....vs a dipole  for
the 57/77 .
57/77  has NEGATIVE GAIN on 10M.....by > 1 db.....vs a dipole.

N0AX wrote regarding the Mosley PRO series:

>On the other bands tested (20 and 15 meters) they performed more or less
>in line with what you would expect from their boom length as did other
>tribanders such as the KT34XA, C31XR, TH11DX, Skyhawk, etc.

For W4TV......While taking a huge amount of time and effort to do "two,
widely
respected "scientific" studies" of TEN different triband antennas in order to
publish a report that is still being sold sixteen years later, according to
N0AX there "wasn't enough time and energy" to put a choke or balun on even
one
Mosley antenna when feedline radiation would be or was suspect in causing the
performance to be less than that of a dipole that DID have a feedline choke
installed.   As VE7RF would say...WTF?

For VE7RF..... Does the report really say the 55/77 has less than 1 dB
gain on
20m as compared to a dipole when Ward says the issue was on 10m and like the
C31XR, SkyHawk, etc they performed more or less as expected according to the
boom length on 20 and 15? If what you and Ward say are both true, what does
that say about the C31XR and SkyHawk?

For K9YC....  If, like the C31XR, SkyHawk, etc, the Mosley antennas performed
as expected for boom length on 20 and 15, I wonder how they might have
performed if they had one of your chokes instead of having the coax directly
connected to the driven element?

73...Stan, K5GO