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@gmail.com <mailto:ericrosenberg.dc@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
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