[TowerTalk] Looking for a Short Rotatable Dipole or...

[Eric Rosenberg]

Thanks for all the suggestions.

In addition to the obvious issue of cost, the following are two issues I 
need to consider:

- Horizontal size and turning radius. The largest turning radius I can 
handle and not get into adjacent trees on one side and hanging over 
power lines is 16 feet.

- Height. My C3-SS sits on a short mast in a 4-legged roof tower on my 
roof. The total height over the peak of the is about 6 feet. Above it is 
my 160m wire that goes from the back of the lot to the front. Off-hand I 
don't know how high the wire is over the yagi.

K9YC (a good friend who's been to this QTH) suggested a vertical with 
radials. I use a DK9SQ mast in my back yard for my Winter only (when no 
one goes out there) K9AY loops, so I'm familiar with it. As the houses 
26 feet wide, there's no place on the roof to put it.

So it's back to the proverbial drawing board. I'll need to study Jim's 
paper previously cited. He's far more methodical than I am, which is why 
I defer to his judgement. Unless I can find an affordable EF-140S, the 
wire options are to load the 160 inv-L on 40, put up a 40m half-square 
(unsuccessful once before) or something else simple.

Thanks again for all of your suggestions. Lots of great ideas!

73,

Eric W3DQ

On 4/29/2016 8:13 AM, Jon wrote:
> Consider a Moxon rectangle.
>
> Less space than a dipole, directivity of a 2 element beam. Light 
> weight and easily home-brewed.  Also look at some of the spider 
> beams.  A few cheap crappie poles, a hub and some wire. Also 
> lightweight and smaller than a full size dipole.
>
> 73,
> Jon
> KD5SFA
>
> On Wednesday, April 27, 2016, Eric Rosenberg 
> <ericrosenberg.dc at gmail.com <mailto:ericrosenberg.dc at gmail.com>> wrote:
>
>      My urban lot is small enough that I don't have much of a 40m
>     antenna worth
>     mentioning.
>
>     I''m looking for a 40m rotatable dipole (preferably a F12 EF-140S)
>     to add
>     to the C3-SS on my roof.
>     The "S"is shortened version. Sadly, nothing larger will fit.
>
>     Any leads (or suggestions for alternatives) are appreciated.
>
>     Thanks and 73,
>
>     Eric W3DQ
>     Washington, DC
>     _______________________________________________
>
>
>
>     _______________________________________________
>     TowerTalk mailing list
>     TowerTalk at contesting.com <javascript:;>
>     http://lists.contesting.com/mailman/listinfo/towertalk
>