[Towertalk] 2eleL 40 and TH7 Stacking

[Jim W7RY]

Thanks Jim!

The TH7 and the 2 element 40 are both older antennas. I should be able to
get at least 10' between em.

I was thinking that it would be better to put the th7 on top. That way the
element droop of the 40 would not be a factor. I know it would be better to
have the 40 as high as possible...But with the element droop it could bring
the spacing requirement to perhaps 8 feet....

What do you think ?


73
Jim
W7RY

----- Original Message -----
From: "Jim Harvey" <n0av@goldfieldaccess.net>
To: "Jim W7RY" <w7ry@centurytel.net>
Sent: Wednesday, November 13, 2002 9:01 PM
Subject: Re: [Towertalk] 2eleL 40 and TH7 Stacking


> Jim,
>
> I have a 402CD at 120' with three TH7DX's below it at 110/70/40'. This is
on
> a rotating Rohn 45 tower and all antennas are oriented in the same
> direction. The SWR curves of all three TH7's are very similar. While I
> normally use all three in a stack I have used the top antenna by itself
and
> the pattern seems to be about what I would expect for a single TH7.
>
> So although I have no specific tests to back this up the ten foot spacing
> seems to work well for me. As I understand the NEW version of the CC 2EL
40
> is not as forgiving when stacked with other HF antennas.
>
> This is not very scientific but I am pleased with my results. Good luck
with
> your project!
>
> 73, Jim  N0AV
>
> ----- Original Message -----
> From: "Jim W7RY" <w7ry@centurytel.net>
> To: <towertalk@contesting.com>
> Sent: Wednesday, November 13, 2002 10:43 PM
> Subject: [Towertalk] 2eleL 40 and TH7 Stacking
>
>
> > I know this has been discussed SEVERAL times before... BUT
> >
> > Has anyone had any REAL success stacking a 2 element Cushcraft 40 and a
> > TH7DX on the same mast ?
> >
> > I do not want to have 1 rotated 90 degrees.
> >
> > How far apart did you need to put them ?
> >
> > Which antenna was on the top of the mast ? Why?
> >
> > Could you measure the interaction ? How?
> >
> > The tower will be 70' of Rohn 45 guyed with non metallic Phillistran.
> >
> >
> > Thanks and It's been a while since I was here on Tower Talk. Time to put
> up
> > another tower after moving from Eastern Washington to Southwest
> Washington.
> >
> > 73
> > Jim W7RY
> >
> >
> >
> >
> >
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