N4KG answers inserted in text below.
On Fri, 11 Jan 2002 Eric Rosenberg <firstname.lastname@example.org> writes:
> I've been toying with the idea of replacing my F12 C3-SS with a C-4
> or similar antenna.
> Recently, I've seen a 40m add-on element for a C3 offered for sale,
> and after making some inquiries, found out from F12 that instead of
> mounting it to the C3-SS, I could likely use this element as a
> dipole over my C3-SS.
> The questions:
> - is this a decent solution? Saves me $$ over having to sell the
> C3-SS and buy a C-4S or so.
YES. The CC D40 is another good option.
Double wall the first piece of tubing for additional
stiffness / increased wind survival. Personally,
I prefer the CC coil loaded element over a short
linear loaded element. I've had NO problems
with my CC 2L40. N4KG
> - how high would this element have to go above the C3-SS. The one
> answer I received so far was "a few feet above the boom of the C3SS >
> and parallel to the boom." What's the definition of "a few feet
GOOD ANSWER. Few = 3 or more.
The boom on a C3SS is 12 ft. Way shorter
than 1/2 WL on 40M so it won't bother the 40M dipole.
At right angles, the 40M dipole won't bother the beam.
Alternatively, you could place the 40M element
above and parallel to the Yagi elements. 10 to 14 ft
spacing usually works well. N4KG
> - how far from this combo would an 80m wire have to be?
As far as possible. You may or may not have
interaction effects. As long as the SWR is not
overly affected, the higher band antennas will
still radiate effectively. You may suffer some
F/B or F/S reduction. N4KG
For our FD stations, we insert a 20 ft 1-1/4 inch mast
inside the 1.5 or 2 inch od masts for our 20 and 15M
Quads, placing an 80M inverted vee at 70 ft and the
Quads at 50 ft. Seems to work quite well. N4KG
> Thanks in advance,
> Eric W3DQ
> Washington, DC
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