[TowerTalk] stack phasing questions

[Guy Olinger, K2AV]

Hi Will,

The problem, of course is that the connect is "out there" on the boom and
will require bringing it in to test it by switching the connection.

Easiest way to try a phase flip is to make a piece of coax electrical 1/2
wave on 40 and add it  between the WX0B and either of the separate coax runs
to the beam DE's.

If that works, you can either wait it out until after contest season or
bring it in and switch as suits you. Lucky this problem is on a single band
beam.

73, Guy.

----------

Guy L. Olinger
k2av@qsl.net
Apex, NC, USA


-----Original Message-----
From: AA4NC@aol.com <AA4NC@aol.com>
To: towertalk@contesting.com <towertalk@contesting.com>
Date: Sunday, November 01, 1998 5:32 PM
Subject: [TowerTalk] stack phasing questions


>
>I'm testing a 2/2 40m stack that uses a Cushcraft 402CD@70' and a
XM240@130'.
>I'm feeding this with a WX0B stackmatch. The 402CD is directly coax fed
with
>some ferrite beads over the coax , and the XM240 uses the Cushcraft MNXM
>balun.
>
>I'm finding the 2 antennas seperately to be close (within 3-5 dB of each
>other) as expected. What I find that bothers me is that the stack is almost
>always slightly weaker than either of the antennas alone. I wonder if it is
a
>phasing problem?
>If so, the bottom antenna would be easier to test phase as I can tell which
>side of the driven element the center/ground of the coax are connected to.
I
>need to find out what the phasing is on the MNXM balun for the top antenna
so
>I can tell if the bottom is out-of-phase. Does anyone know how this balun
is
>wired?
>
>Any ideas/suggestions would be appreciated.
>
>73,
>
>Will
>
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>


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