[TowerTalk] Mosley Antenna Question

[Don]

I have a TH7DXS at 72 and and a A3WS at 78 feet. With 80 MPH gusts and 
sustained winds often in the 50's  and 60's during the winter here on the 
ocean the elements move around a lot - have not had one break or bend yet in 
the 13 years they've been up.

Don W7WLL



-----Original Message----- 
From: john at kk9a.com
Sent: Thursday, February 26, 2015 2:14 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Mosley Antenna Question

Interesting information Jim. If I were in the market for a tribander I
would definitely buy the K7LXC report. One potential problem with
interlaced beans is that there appears to be little room for side mounting
them on a tower. I also wonder what happens when they are used in a windy
environment and the closely spaced element move around.

John KK9A


[TowerTalk] Mosley Antenna Question
from [Jim Thomson] [Permanent Link][Original]
To: <towertalk at contesting.com>
Subject: [TowerTalk] Mosley Antenna Question
From: "Jim Thomson" <jim.thom at telus.net>
Date: Thu, 26 Feb 2015 07:32:51 -0800
List-post:
73, Jim K9YC


##  heres the latest from F12.    20-15-10  all on barely a 10 ft boom.
http://www.force12inc.com/products/xr3-compact-6-element-20m-15m-10m-multi-mono-contest-yagi.html

##  heres the latest and greatest..with booms shrunk by 30%.  The old C3,
xr5
etc line up has been upgraded to the newer format.
http://www.force12inc.com/categories/beam-antennas/all-new-xr-series-multi-mono-hf-yagi-beams.html?sort=pricedesc

##  BTW, I see n6bt  wrote an entire section on  trapped yagis in his book,
array of light. .   Turns out I was correct.   By encasing the coils  with 
AL
tube, the coil Q  drops down to just 20-30.
feed Z rises to close to 50 ohms..cuz of the excessive losses by the high 
esr
of the low q coils.    He mentioned that one maker of trapped verticals
used a
ceramic core to wind the coils on,
so it would handle the extreme temps.

##  He also mentioned about HF yagis using the T match...and the 200:50 ohm
coax balun.   Several of them had the main lobe canted  off to one side by 
20
degs !   The fix was to replace the T
match with a conventional hairpin setup. He did not mention the brand, but I
suspect it was telrex... the only co I know of that used a T match.  Why the
lobe ended up skewed  20 degs  to one
side is beyond me.  He mentions fixing several of them.



Jim  VE7RF

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