The C3 has an insulator that grabs and spans across the close spaced elements
and keeps them from banging together. The process is also described in the
Array of Light book.
Chris
KF7P
On Feb 26, 2015, at 15:14 , john@kk9a.com wrote:
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@contesting.com>
Subject: [TowerTalk] Mosley Antenna Question
From: "Jim Thomson" <jim.thom@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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