Now I'm confused....why should you need feedline to make the SWR good?
I also wonder if the other antennas might be affecting your 15 meter
SWR...particularly that WARC antenna 6 feet away. Perhaps 15 is coupling
with the 17 meter elements a bit.
Anyone else notice a problem on 15 with the C31XR?
73, Ty K3MM
To: towertalk@contesting.com
cc: thejoz@compupgrades.net (bcc: Tyler G Stewart/BENN/CEC)
Subject: [TowerTalk] Force 12 C-31XR
Howdy, TowerTalkians --
Just finished installing a new C-31XR for Jon, K7ZA, and thought I'd
give a couple of impressions.
The antenna mechanically is typical Force 12 which is to say
excellent.
There is a plexiglass piece with holes in it that is used for tying the 2
driven elements together. These elements are very close and any wind motion
causes element movement and gyrations in SWR so these pieces add some
rigidity
to the driven elements. The piece with the hoseclamps is a little funky but
works FB.
The SWR leaves something to be desired. Jon is a CW operator so as
long
as it looks good on CW, he's satisfied. Unfortunately I think the 15M
driven
element is too long as it seems to resonate around 20.500 mHz. The 15M CW
SWR
is acceptable but it renders the SSB SWR unacceptable. We decided to live
with
it.
This antenna can NOT be tuned on the tower - it needs 100 feet of
feedline per the manual to make the curves look good. The antenna was
mounted
about six feet below a CC A3WS and twelve feet below a F12 40M dipole.
The published F12 gain figures corollate with our tribander test
report
results so I have a high level of confidence in N6BT's figures. The
published
gain figures are impressive - I predict that this antenna will the one to
beat.
Jon's first contact was a DX station that gave him an unsolicited
"great
sig" report - this was with 100W. Jon has a very nice 'one tower station'
with
the above configuration. He's got slopers on 80M so he's got all bands
covered
from 80 to 10M with a 160 inverted L planned.
Cheers, Steve K7LXC
Champion Radio Products
Tower Tech
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