On Sun, 19 Mar 2006 22:15:00 -0500, Mike Coslo
wrote:

ml wrote:
hi


i am pondering this again after thinking the odds of being about to put
a beam up are slim

currently i have a nice dipole CF horiz via a topside sgc , i am happy
w/it


i think i might be able to get a verticle (all bander) up there but then
i wonder

overall if it would really pay from just a performance point of view

the reviews i see i personally average as some signals would prob come
in bettter on one and some signals the other 'depending'

And HOW!
I've been running some experiments comparing the two, and frankly have
been having some problems simplifying the experiment enough to make good
sense and be valid at the same time.

Some times the vertical works better, and sometimes the horizontal
works better. I'm having a heck of a time correlating exactly *why and
when* (I'm not the only one - some Dutch amateurs got some surprising
results when they tried to decipher what would be the best antenna to
use in the PA contest. Some signals predicted to come in Groundwave were
coming in Skywave, and vice versa - this was covered in a recent QST)

What I have seen from my experiments has led me to believe that the
answer to "dipole vs Vertical is an emphatic, no question about it one
answer only - YES!


You want both antennas if you can do it. Anyone who declares one or the
other the winner is simply wrong.

- 73 de Mike KB3EIA -

I did some tests a couple of years ago on 10 meters between vertical
and horizontal on an 1800 mile path. It seems that there is quite a
bit of rotation in polarity of the signal from minute to minute. I
tried right and left hand circular to confirm that it was rotation.

73
Gary K4FMX

"Gary Schafer" wrote in message
...



You want both antennas if you can do it. Anyone who declares one or the
other the winner is simply wrong.

- 73 de Mike KB3EIA -

I did some tests a couple of years ago on 10 meters between vertical
and horizontal on an 1800 mile path. It seems that there is quite a
bit of rotation in polarity of the signal from minute to minute. I
tried right and left hand circular to confirm that it was rotation.

73
Gary K4FMX


Cross-polarization losses are in the neighborhood of 10-20 dB at VHF and
above. With my license, I cannot do HF, so others may chime in with those
numbers. Assuming ... there's that word ... that the random polarization
variations ("rotations") are around some central figure, during for a given
QSO, then one antenna will work better -- the one that happens to be optimum
for that path and for the antenna on the other end of the QSO.

There exists a phenomenon that I do not understand well, called Faraday
rotation, where an EM wave passing through a magnetic field will undergo a
polarization "alteration", so to speak. Thus, two verticals on the ends of
a long-distance QSO might not perform as well as if one were a vertical and
the other a horizontal -- due to the Earth's magnetic field.

John
KD6VKW