[TowerTalk] add a 3rd el to 40-2cd

[Grant Saviers]

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 at 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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