Commercial omni antennas are specified with "down-tilt" all the time,
usually to enhance close-in performance in a mobile environment. It's
done by altering the phasing between the stacked vertical elements, as you
suggested.
Jay W9RM
Keith J. Morehouse
via DROID 3
On Aug 8, 2014 2:00 PM, "Buddy Morgan via VHFcontesting" <
vhfcontesting@contesting.com> wrote:
> Something that I am going to try, someday, is stacking antennas with some
> downlook. I look at the vertical patterns of low to the ground or vehicle
> mounted horizontal antennas and wonder what would happen if I added a few
> degrees of phase lag on the upper antenna? This should lower the radiation
> angle. Has anybody ever modeled this?
>
> Buddy WB4OMG
>
>
> In a message dated 8/8/2014 2:49:03 P.M. Eastern Daylight Time,
> mike@ka5cvh.com writes:
>
> I'm playing around with some ideas for portable activation and roving.
> Would there be any advantage to stacking moxons on six? I'm
> thinking that you could tighten the vertical angle some but don't know
> if that would really help or hurt? I presume that you would space
> them as you would any yagi. Or am I so far off base I should be
> embarrassed for asking :-)
>
> --
> Mike Urich KA5CVH
> http://ka5cvh.com
>
> http://ka5cvh.com/faith/salvation.htm
> The highest governmental "authority" in America is its Constitution.
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
> _______________________________________________
> VHFcontesting mailing list
> VHFcontesting@contesting.com
> http://lists.contesting.com/mailman/listinfo/vhfcontesting
>
_______________________________________________
VHFcontesting mailing list
VHFcontesting@contesting.com
http://lists.contesting.com/mailman/listinfo/vhfcontesting
|