Date: Fri, 15 Nov 2024 17:38:19 -0500
From: Stan Stockton <wa5rtg@gmail.com>
To: "TowerTalk@contesting.com" <TowerTalk@contesting.com>
Subject: [TowerTalk] In phase?
<Now, I decided to make another large tribander and built a swing arm so I
can rotate it and <have the other balun on it. I know I didn't change that
balun. The antennas are at 78 and <47 feet. I am seeing some S Meter
readings when switching between, upper, lower, both <that make me wonder
whether I actually have them 180 degrees out of phase instead of in <phase.
<Thanks?Stan, ZF9CW
## 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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