[TowerTalk] Antennas questions...

[Cqtestk4xs at aol.com]

I used a three high stack of KT36XAs with good success at KH7XS for three  
years....only 90/60/30, but they worked.
 
Bill K4XS/KH7XS
 
 
In a message dated 8/23/2012 9:44:53 A.M. Eastern Daylight Time,  
cx6vm.jorge at gmail.com writes:

Hi  Marcelo

What´s the height of your tower?

I think you are looking  for the best choice for a stack of tribanders on
your tower, don´t know if  you can put 3 tribanders, that will be very good.

So the question is,  wich tribander choose for your  stack!

73,
Jorge
CX6VM/CW5W

-----Mensaje  original-----
De:  towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com]  En nombre de K8RI
Enviado el: jueves, 23 de agosto de 2012 00:53
Para:  towertalk at contesting.com
Asunto: Re: [TowerTalk] Antennas  questions...

On 8/22/2012 5:17 PM, Marcelo Egues wrote:
>  Hi..
>
> I have some questions about the real performance of the  tribander
antennas.
>
> I like Mosley antennas for the  durability, construction and
performance....
> I've seen several  tribander antennas (Bencher, Optibeam, M2) with less 
> performance than  the TA34 (comparing gain on website).
> It´s correct?

You will  find all kinds of claims for gain, f/b, and longevity from most
antenna  manufacturers.  An antenna that is rugged, has good gain, and  good
front to back is going to be expensive...and likely "big".  A  number of the
really good antennas of yore are no longer available.   C3i is an example.
They made really good antennas and stood behind them.  
They weren't perfect antennas and you weren't going to run 4 or 5 KW  
through
them, but they worked well.

Everyone seems to have favorites  that have been up for years, or decades 
BUT
those are too few examples to  be statically meaningful.
It's like reading "ham reviews": Typically nearly  everyone who purchased an
expensive rig or antenna things it is the  ultimate, with a few thinking 
it's
a POS.

The one thing in common  among all advertized gain figures whether dbi or
dbd, is an inconsistency  because those gain figures are either calculated 
or
are measured at a  specific site. If measured they are specific to the site
where they were  measured and the "skill" of the person doing the
measurements as well as  the advertizing departments .... ah...ahhhh...spin,
not that I'd ever  accuse any of them of embellishing the test results.

I've had many  different makes and models over the past 50 plus years. 
I've had multiples  of a number of them over the years, particularly
tribanders and multiband  verticals and I have done comparisons between a 
few
of them and all of them  required maintenance at one time or another.

One thing I can say with a  certainty:  There are often changes in the same
make and model over  the years.  I recently put up a Cushcraft R8 and am
getting ready to  put up a new Hy-Gain AV-640 for comparisons.
These antennas look very much  alike, were designed by the same person with
the AV640 coming after the  R8.  Both companies are now owned by the same
company. There is  definitely a noticeable difference between the two as far
as "put up and  go" as well as bandwidth.  Major difference when using a VNA
for  analysis.

I wish I'd had the VNA available years ago.

I also  wish I had taken photos of the parts finish of the earlier AV640
compared  to the current production (IE Post buy out) and also had one of 
the
earlier  R8's for comparison.

At any rate, if you like Mosley, then go with it,  but be careful about
advertizing claims.  It may or may not perform  according to a bunch of web
site comparison figures, but in the real world  on a day by day basis you 
are
unlikely to be able to tell any difference  between it and the typical
tribander unless their quality control has gone  down the toilet, which has
definitely deteriorated with some  companies.

73 and good luck on your choice what ever it may  be.

Roger (K8RI)


>
> Thanks you for  reply..
>
> 73
>
> Marcelo CX2DK
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