[TowerTalk] CC XM240 above a big Tribander

[Dave Hachadorian]

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 at 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 at 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 at 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
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