[Antennas] Stacking 2m Antennas

[D.J.J. Ring, Jr.]

Cushcraft used to have info in their manual.

Here's an archived copy:
http://web.archive.org/web/20070203081221/http://www.cushcraft.com:80/support/pdf/insert.pdf


Horizontal stacking distance is 79 inches.  (aprox. 1 wavelength)  It is
fed in phase through a T connector in the center of two identical
feedlines.  You will see they give two measurements for this "B" distance,
and it's just because the yagi with more elements has the feedline further
away, thus more feedline is needed.

I'm guessing you are horizontally stacking horizontally polarized antennas
which will add about 3 dB gain and will compress the vertical height of the
radiation lobes of the antenna.  In other words, your beam doesn't get
sharper but your focusing more radiation on the horizon (the vertical
pattern is sharper.)

MFJ sells a stacking kit.  You can stack one over the other, or you can
stack two side-by-side, or you can use four of these antennas and stack
them both horizontal and vertical.

73

DR
N1EA




On Tue, Apr 30, 2019 at 6:06 PM Rob Matherly <jimrob at gmail.com> wrote:

> Hi All -
>
> Looking for info on vertically stacking horizontally polarized 2m antennas.
> The research I've done indicates that the formula
>
> 57 / -3dB beam with (H/V) = stacking distance in wavelengths
>
> Is a good starting point.  The relevant BW for my antenna, a Cushcraft
> A14810-S, shows an E of 40 and H of 46. I presume the E BW is what I need,
> correct? If so, that would put the stacking distance of 1.43 wavelengths.
>
> I'm not finding much on the phasing. What would need done there?
>
> Thanks!
>
> --
> Thanks,
> Rob Matherly, W0JRM
> SKCC 29, FPQRP 330, NAQCC 7688, FISTS 19246
>
> "Aude, vide, tace, si vis vivere in pace."
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