: Saturday, August 08, 2015 11:23 AM
To: topband@contesting.com
Subject: Re: Topband: [Bulk] Best wire antenna for roof top location
And remember -- the roof of this building is 110m, so a horizontal
antenna is high enough to have pretty good low angle radiation! See
http://k9yc.com
To: topband@contesting.com
Subject: Re: Topband: [Bulk] Best wire antenna for roof top location
And remember -- the roof of this building is 110m, so a horizontal
antenna is high enough to have pretty good low angle radiation! See
http://k9yc.com/VertOrHorizontal-Slides.pdf and double the heights
And remember -- the roof of this building is 110m, so a horizontal antenna
is high enough to have pretty good low angle radiation! See
Large buildings are not towers or poles. Buildings have a significant amount
of large conductive metallic things and noise generating junk inside.
A
Some years ago, on 80 meters, an LZ station had a horizontal between
two tall buildings and had a very strong signal.
73
Bruce-k1fz
www.qsl.net/k1fz/beverage_antenna.html
On Sat, 8 Aug 2015 10:58:22 -0400, Tom W8JI wrote:
And remember -- the roof of this building is 110m, so
: Saturday, August 08, 2015 11:23 AM
To: topband@contesting.com
Subject: Re: Topband: [Bulk] Best wire antenna for roof top location
And remember -- the roof of this building is 110m, so a horizontal
antenna is high enough to have pretty good low angle radiation! See
http://k9yc.com/VertOrHorizontal
Some years ago, on 80 meters, an LZ station had a horizontal between two
tall buildings and had a very strong signal.
73
Bruce-k1fz
Between buildings is entirely different than on a building roof.
Full context is important. As I said:
A simple vertical antenna has elevation pattern mostly
Even with a 400 ft high building, a horizontal antenna a fraction of wave
over the roof can be very disappointing.
Tom is 100% right, one of the best rood top signal on top band is from
9M2AX. Ross tested several antennas and the only one that worked well was
the inverted L. He has a tall
Have you surveyed the site for HF RFI? One mountain top property I was
considering had awesome 360d unlimited visibility but had so much power
supply hash, PIM, intermod, etc. from comm installations that any
amateur operation would be near impossible. My spectrum analyzer showed
huge
For 160 DX, a vertically-polarized antenna (fed against a proper ground) is
best.
http://www.w0btu.com/160_meters.html
73, Mike
www.w0btu.com
On 8/7/2015 16:52 PM, Nuradi wrote:
I plan to install wire antenna on a roof top of a 33rd story building
(about 110 metres above the ground) for
Careful Mike! Jakarta is close to the equator, and power coupling is
likely to be better from a horizontally polarised antenna, especially in
an E-W direction. Ref The Big Gun's Guide to Low-Band Propagation by
Bob Brown, NM7M (SK)
On 2015-08-08 12:40 p.m., Mike Waters wrote:
For 160 DX, a
Really?! I think I just learned something important. Thanks, Greg!
73, Mike
www.w0btu.com
On Fri, Aug 7, 2015 at 8:24 PM, Greg - ZL3IX zl...@inet.net.nz wrote:
Careful Mike! Jakarta is close to the equator, and power coupling is
likely to be better from a horizontally polarised antenna,
And Bob Brown used a monograph by J.A. Ratcliffe--The Magneto-Ionic
Theory and its Application to the Ionosphere which says the same thing.
It has to do with the angle between the E vector and the Earth's
Geomagnetic Field, which is horizontal at the geomagnetic equator. Bob
borrowed my copy
And remember -- the roof of this building is 110m, so a horizontal
antenna is high enough to have pretty good low angle radiation! See
http://k9yc.com/VertOrHorizontal-Slides.pdf and double the heights for
the graphs of 80M performance. When you're thinking height, consider
the building a
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