[TowerTalk] In phase?

[john at kk9a.com]

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.