It's amazing how different results can be at different stations. W4ZV
says the same thing...no difference.
However, at four different stations I've had, BIP/BOP makes a difference.
Sometimes BIP and BOP are equal, other times there may be a difference of
1 to 2 S units. This occurs on both domestic and DX stations.
The only time it does not is on the long haul stuff like UA9/VU2 etc.
There it is always better on BIP.
My phasing may be different than many as I feed the top two of my stacks
and the bottom two separately. I then BIP/BOP the two. On 40 however, my
stack is phased in the conventional way...with phasing harness and an
Ameritron RCS8 box.
YMMV, obviously
In a message dated 8/1/2013 1:50:20 P.M. Coordinated Universal Time,
k1ttt@verizon.net writes:
I tried BIP/BOP on 10m and saw no advantage to it... but stacking antennas
at 30'/60'/90'/120' with various combinations and single antennas
available is definitely an advantage
Aug 1, 2013 09:34:49 AM, john@kk9a.com wrote:
A lot can be done with two tribanders. Besides changing the radiation
angle you can also beam in two directions which is very useful if you
contest.
I had BOP capabilities with my 40m beams. I thought that it would be great
for the one domestic contest (November Sweepstakes)that I operate however
I have never found this option useful. I have never tried it on other
bands.
John KK9A
To: TOWERTALK@contesting.com
Subject: Re: [TowerTalk] How High is enough...(HFTA) now
From: Cqtestk4xs@aol.com
Date: Wed, 31 Jul 2013 21:31:30 -0400 (EDT)
Having the ability to change that optimal angle is a big advantage.
Although my stacks are all very high, the ability to BIP/BOP them allows
me to
accommodate the higher angles that are not covered by the higher antennas.
Of course, if you don't have stacks, you can do the same sort of thing
with a second antenna at 50 feet. Not only does this allow a change of
angle,
but with this proper phasing apparatus you now have a second antenna...but
also a stack that can be switched in and out of phase.
That would be my recommendation.
Bill K4XS/KH7XS
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