Kostas,
As others have said, it is all about boom length with 3 elements. I
built a W6NL Moxon (scratch design) and have a custom 3L full size 40m
on a 48' boom. Moxon is at 92', 3L at 140'. Needless to say, the 3L is
a mighty "flamethrower" vs the Moxon, hardly a sensible comparison,
height, boom length, extra element. F/B and F/S with the 3L is quite a
bit better, listening A/B. My Moxon is a very good antenna, the full
size 3 element is a great antenna. In some contests the Moxon covers
the USA and the 3L is pointed at the DX opening.
From what you have, building the strengthened K3LR version of the W6NL
Cushcraft/Moxon is a straightforward and proven way to get a very good
antenna.
Grant KZ1W
On 3/6/2018 13:57 PM, john@kk9a.com wrote:
I have OptiBeam 40m antennas and when playing with a model, adding an
element really did very little. I do not recall the details but I think
some things like SWR bandwidth were even worse. You are probably better
off using the aluminum to make a Moxon
John KK9A
From: kostas sv1dpi
In my club we have a Cushcraft 40-2cd antenna. We are very satisfied with
this antenna. Recently, one of our members, donated us a second 40-2cd. We
have not a tall tower to put them in phase (the antenna now is at
22m-72ft). We made a thought to shrink a little the reflector of the 2nd
antenna and use it as director in a 3el configuration. Do you think that
it will work? Can anyone to make a model and tell me what is the new
length of the boom and in what position we need to put the elements to
have 50 Ohms and finally which is the gain?
On behalf of SZ1A
73 Kostas SV1DPI
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