[TowerTalk] stack phasing questions

James Sawyer wa6znm@jps.net
Sun, 01 Nov 1998 19:21:52 -0800

I think you should make both antennas equal at the feed point.   If you use
a balun on one you need to match that on the other.   Make shure that
baluns are the same and connected the same.


At 05:31 PM 11/1/98 EST, AA4NC@aol.com wrote:
>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
>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
>Any ideas/suggestions would be appreciated.
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