Here is a diagram of my space (use fixed width font):
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| | | |
| | | |
| | | |
| ----------------- |
| |
| |
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The small rectangle on top is a small building (10'x20') on top of the
roof of the 10-story apartment building. Actually, it will be my bedroom
(and, I think, shack). The larger rectangle is the roof area at my
disposal. It is about 10' x 30' plus the areas at the side of the
building. The rest of my apartment is below the roof.
I would love to put a little roof tower on the building with a beam on
it! But as far as I know, that is not allowed.
I am thinking about verticals, about 3 fiberglass masts holding up a
shortened 40m dipole, etc.
For 6 and 2 m I have 3 element beams which are small enough that they
will be allowed.
On 9/28/13 8:01 AM, Edward R Cole wrote:
Vic,
Too bad you cannot consider a yagi for 20-10m. That would sit on a mast
secured to the small roof-top building. So a 30x 10 foot space? I
wonder if the 20x10 foot building extends beyond the 30x20 area?
It it extends so total length is 50-feet You could put up a doublet
across the length, either horizontal with 8 foot droop on both ends for
full length half-wave on 40m or perhaps a pole in the center for
inverted-V. Another idea is 50-foot with 8-foot legs at
right angles but horizontal at the same height. Or consider a 120-foot
horizontal loop if there are places for four support poles. Being on
roof of ten stories means the wire does not need to be very high.
An automatic tuner at the roof would finish off any multiband antenna
with single coax run to shack. To add 6m/2m simple solution is a
base-loaded 5/8 6m wave vertical (could be a mobile whip). They load
fine on 2m as well (trick of VHF mobile stations).
73, Ed - KL7UW
----------------------
Date: Fri, 27 Sep 2013 21:47:41 -0700
From: "Vic, K2VCO" <k2vco....@gmail.com>
To: elecraft Reflector <elecraft@mailman.qth.net>
Subject: [Elecraft] Antenna suggestions, resent
Message-ID: <52465f6d.9060...@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I just realized that my previous message was sent in html format. Which
means that the reflector stripped the text! That explains some of the
answers...
Here is what I meant to ask:
----------------------------------------------------------------------
I am moving to an apartment on the top floor of a 10 story building. I
have access to the roof which has a 30' x 10' flat space. On one edge of
this space is a building 9' high with a flat roof of about 10' x 20'. I
can put up antennas on top of this little building and on the flat area
mentioned above.
But there is a catch: the antenna has to be either a wire antenna, or
substantially vertical. If vertical, it can't exceed 29' in height above
the roof of the small building. Beams not allowed!
I want to operate on 40 through 15 meters. The antenna needs to be able
to handle 1500w.
I prefer horizontal antennas because of the extra gain and lower noise
pickup. I prefer a balanced antenna because of noise and RFI
considerations. But I'll consider other options if there are overriding
advantages.
Suggestions
73, Ed - KL7UW
http://www.kl7uw.com
dubus...@gmail.com
"Kits made by KL7UW"
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--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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