Steve,
I don't know how you'd do it mechanically. But, as long as we're
speaking hypothetically, you could mount the antennas so that the
spacing increased from front to back. Some of the wire zig-zag
log periodic antennas were stacked this way. This maintains the
stacking distance to be nearly optimum for each operating
frequency. Only a small (usually 3 element) cell of the antenna
is active on any one frequency.
73, Eric N7CL
>From: owner-towertalk@contesting.com
To: <towertalk@contesting.com>
>Date: Sun, 22 Nov 1998 10:36:03 EST
>
>Greetings, TowerTalkians --
>
> Let me pose a general hypothetical question; I'm going to ignore
>takeoff angles for the moment (I don't know if this is possible with this
>question - sorry).
>
> Suppose I had two non-LP multi-band yagi antennas that covered 40
>through 10M and was interested in contesting. In the overall scheme of things,
>is there a stacking distance that would allow the benefits of stacking with a
>minimum of compromises? For example, is 50 feet too far on 10M (and 15M?) and
>too close for 40M? Intuitively I think it would be better to have the 40-10M
>antenna on the top of the tower and drop the 40M from the bottom antenna. This
>would probably simplify the whole scenario.
>
> I don't have and am not fluent with any antenna modelling software so
>I'm just trying to get a feeling for this proposed system. Any input greatly
>appreciated.
>
>Cheers, Steve K7LXC
--
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