I have to apologize for my previous posting on this subject that
said I had an XM240 6 feet above a KT-34XA. My 40 Meter antenna
is the 40-2CD, not the XM240. I got the model numbers mixed up.
Sorry for the confusion.
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: N2TK, Tony
Sent: Thursday, April 17, 2014 5:26 AM
To: 'reflector Towertalk'
Subject: Re: [TowerTalk] CC XM240 above a big Tribander
Wasn't there something said years ago about grounding the
reflector on the
XM240 so it would work like the earlier 402CD? I can't remember
if this was
intended to reduce the interaction on 15M or if you had the
antenna at right
angles to a 20M beam the grounding would reduce a 20M resonance
on the
XM240?
Lots of cobwebs in the belfry on this one.
73,
N2TK, Tony
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On
Behalf Of Bill
Parry
Sent: Wednesday, April 16, 2014 11:40 PM
To: 'Dave Hachadorian'; 'reflector Towertalk'
Subject: Re: [TowerTalk] CC XM240 above a big Tribander
Dave
I guess that it is all a matter of antennas and situations. I put
up a XM240
at about 133 feet above a Force 12 C3E at 120 feet or about 13
feet apart.
The interaction between the two was fairly obvious and the SWR on
15 was not
good. I turned the C3E 90 degrees and the problem vanished. I
had the
antennas down after a lightning strike about 4 years ago and
tried it again
with the same results.
Both antennas work just fine in the current configuration. I was
sure that
the 13 feet would be enough but it definitely was not.
Bill W5VX
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On
Behalf Of Dave
Hachadorian
Sent: Wednesday, April 16, 2014 8:50 PM
To: reflector Towertalk
Subject: Re: [TowerTalk] CC XM240 above a big Tribander
My XM240 is six feet above a KT-34XA. The booms are aligned. It
works for
me.
After you get the antennas installed, run a f/b ratio test on the
tribander.
Front-to-back ratio is easy to measure, and is the most sensitive
test for
adverse interaction. Here is more info:
http://lists.contesting.com/archives//html/Towertalk/2006-08/msg00634.html
I just noticed an error in the last paragraph of that 2006
posting. The
last paragraph should read, "Sometimes just changing the length
of the
40-2CD's feedline, or shorting/opening its feedline when the
antenna is not
being used will solve interaction problems."
Dave Hachadorian, K6LL
Yuma, AZ
-----Original Message-----
From: Marsh Stewart
Sent: Wednesday, April 16, 2014 5:15 PM
To: towertalk@contesting.com
Subject: [TowerTalk] CC XM240 above a big Tribander
How close vertically on the same mast can a new CC XM240 be to a
big
10/15/20M tribander without serious interaction?
Marsh, KA5M
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|