[Antennas] Stacking 2m Antennas

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

That antenna is vertically polarized so you are vertically stacking two
vertically polarized antennas.

MFJ sells a stacking kit.  I'd buy it.

73

On Tue, Apr 30, 2019 at 8:32 PM D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:

> 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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>