In a message dated 4/11/2007 4:38:18 PM Eastern Daylight Time,
er_araujo@yahoo.com writes:
1 - Why the loops are receiving more noise than
distant signals? Could it be a matter of
polarization?2 - could it be possible I need to use
horizontal polarization with the loop? could it be
done simple rotating it 90 degrees?
3 - If I suffer the same symptom from the pennant,
Could it be possible to change it to horizontal
polarization? how?
4 â Any other idea is welcome
Many thanks in advance dear fellows, and as suggested
by many, I didn't give up. LU2DKT...Edy.-
Edy -- you say your rooftop is 150 ft high? Does that mean you are in an
apartment building? If so this could be a clue to the problem.. The
magnetic loop has a pattern without any vertical directivity - like a donut on
it's
side. It will receive everything from 0 degrees straight out onto the horizon
right up to 90 degrees straight up. The null from a magnetic loop is very
sharp in the direction of the plane so if you have a very noisy powerline
directly in front of your building you aim the side of the loop to it and will
be
reduced considerable. BUT in your case the noise maybe coming from all over
-- includings straight down through the building. I have always noted that
the WORST noise situation is ALWAYS in hotels, apartments and office buildings
because there is simply too much noise from too many different places.
I am afraid that you may have the same issue with the Pennant IF this is the
issue with noise from all over the place. It may be a little bit better
since the Pennant has a lot more vertical plane directivity but if a great
deal
of your noise is coming from below the antenna that could be the same
problem...
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