[Elecraft] Antenna suggestions, resent

[Jim Miller]

IMHO  - If wire, I would make a "fan dipole".  Multiple dipoles (one length
for each band) connected together at the feed point and run together (a few
inches apart) for their full length.  For the 40 meter portion if it is too
long just let the ends hang down as long as you are using fiberglass poles
(tie them so they don't fly in the wind) or bend them horizontally (do not
bend tighter than 90 degrees) instead of using coils as your efficiency will
be better and your power will not be restricted.  73, de Jim KG0KP

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Vic, K2VCO
Sent: Saturday, September 28, 2013 1:38 PM
To: Edward R Cole; Elecraft Reflector
Subject: Re: [Elecraft] Antenna suggestions, resent

Here is a diagram of my space (use fixed width font):

            ----------------------------
            |    |               |     |
            |    |               |     |
            |    |               |     |
            |    -----------------     |
            |                          |
            |                          |
            ----------------------------

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.vic at gmail.com>
> To: elecraft Reflector <elecraft at mailman.qth.net>
> Subject: [Elecraft] Antenna suggestions, resent
> Message-ID: <52465F6D.9060505 at 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
> dubususa at gmail.com
> "Kits made by KL7UW"
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--
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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