I tried it with a couple of stacked 10 meter beams and found that it might
occasionally allow me to copy a signal off the back by reducing the qrm
from the signals coming from the front. Not worth the effort in my opinion.
Chuck W5PR
On Sat, Nov 16, 2024 at 7:13 PM <john@kk9a.com> wrote:
> I have heard of people that like the out of phase option however I had the
> same abysmal experience trying BOP on 40m as VE7RF's buddy.
>
> John KK9A
>
>
> Jim VE7RF wrote:
>
> ## A buddy in wash state tried the Top, Bottom, both in phase (BIP), and
> both out of phase (BOP), on his stacked 40m yagi's (180' and 90'). I
> designed the box.
>
> ## That BOP was an abysmal experiment, wasted effort. After 6 months, he
> finally found just one instance (40m daytime) where BOP was the
> loudest...and that was with both yagi's pointed south....and the station
> was in Ore...at 11:00 AM. in the spring.
>
> ## I know one other fellow who had similar results on 20m....lousy. The
> BOP function might work on 17-15-12-10m..... dunno.
>
> ## Looking at it in software at the time, BOP had more gain, BUT at a
> higher angle than the bottom yagi by itself. BOP is too high an angle, so
> yes, you got more gain, but the angle is too high...and results sucked.
>
> ## So if you did wire one balun out of phase compared to the 2nd balun,
> you would probably know about it asap.
>
> ## Buddy found that BIP was always the loudest 90% of the time. Switching
> from BIP to BOP was like apples and oranges, blatantly obvious.
>
>
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>
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