[Towertalk] Notes on my new tower

[n4kg@juno.com]

On Fri, 5 Apr 2002 12:34:38 EST K7LXC@aol.com writes:
> In a message dated 4/5/02 8:36:55 AM Pacific Standard Time, 
> w5vx@hiline.net 
> writes:
> 
> > 1. I stacked a Cushcraft XM240 at 131' and Force 12 C3E at 120 
> feet. I used  the rule of thumb that the stacking distance should be at
least 
> 1/2 the  boom  length of the higher frequency antenna. (C3E has a boom
of 18 
> feet). This  is  not a good rule of thumb for these two antennas. Both
the XM240 
> and the C3E  were significantly detuned from the specifications. The
120' 
> tower has  non-conductive guys on the top three sets so that couldn't
have 
> been the  problem. We turned the C3E 90 degrees from the XM240 and both

> antennas play  fine. Not my favorite idea but it works.
> 
>     Yes, I had the same problem with the XM240 and a TH11. 
> Turning  them 90  degrees made it WORSE so we tried to get 
> distance between them - it  helped.
> 
>    K7LXC

Did you (or anyone) try connecting the XM240 Reflector to the boom
(similar to the 402CD) ?

Did you (or anyone) try changing the termination on the XM240
feedline (short to open, open to short, change length) ?

Tom  N4KG



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