[TowerTalk] STACKED 40 METER BEAMS MATCH

[Larry K4AB]

I use a Stackmatch to feed dissimilar antennas in order to spray RF in two
directions.
For example, during this past Sweepstakes, I fed a tribander at 60' pointed
NW along
with a different type of tribander pointing NE. Both with different
types/lengths of
feedline.

All worked well, but despite claims, the Stackmatch did not evenly
distribute power
to each antenna.  In my case, 600 watts to one antenna, and 350 watts to the
other.

This is probably by design, since I know of no broadbanded device (1.8-30
mHz) that
can effectively distribute to vastly different loads.

However, the Stackmatch did keep my amp happy by presenting it with a nice
VSWR.
Someone on this reflector (I forgot who) mentioned that the Stackmatch has
proven design flaws.  Could someone elaborate on them?

73,
Larry K4AB



On Mon, Nov 22, 2010 at 3:29 PM, <john at kk9a.com> wrote:

> I installed a StackmatchII+ a week ago on my 40m beams at 160' and 75' and
> I
> tested it out thoroughly during the Sweepstakes contest this weekend.   In
> nearly all cases, BIP was better than BOP so I rarely used BOP.
>
> John KK9A  -  W4AAA
>
>
>
>
> To: TOWERTALK at contesting.com
> Subject: Re: [TowerTalk] STACKED 40 METER BEAMS MATCH
> From: Cqtestk4xs at aol.com
> Date: Mon, 22 Nov 2010 08:35:32 EST
> List-post: <towertalk at contesting.com">mailto:towertalk at contesting.com>
>
> In a message dated 11/22/2010 3:59:10 AM Greenwich Standard Time,
> jim.thom at telus.net writes:
>
> After  hundreds of recent tests, the BOP  mode is a dud  for the most part.
>  Even when listening to these
> daytime 40m nets,  BIP is louder  than  BOP
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> My results with BOP have been quite different.  On all bands  from 10-40 I
> incorporated BIP/BOP/TOP/BOT and found the BOP quite useful.   Perhaps it
> was because my stacks were quite high.  ie. 200 for 40, 200 for  20, 140
> for
> 15 and 165 for 10.  With the exception of the 40 stack, all  were 4 or 6
> high
> stacks...maybe that was the reason.
>
> Bill KH7XS/K4XS
>
>
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