I have a 4 element long boom yagi on 28MHz at 90 feet and a C3 at 35 feet.
There are times when the yagi will outperform the C3, usually if the station
is further away, and there are times when the C3 works best, usually near in
stuff. But not always, and the difference may be significant. 10-20 dB or
so. When I have both antennas at the same elevation it is extremely
difficult to tell the difference. If the signal is in the noise on the yagi
I cannot hear it on the C3.
The biggest difference I see is a result of elevation difference.
I suggest you remove the 28MHz yagi when you install the C3, or investigate
the possibility of removing the 28MHz elements from the C3 to avoid
interaction.
de Paul, W8AEF
----- Original Message -----
From: "Favieres RC" <f6kcp@yahoo.fr>
To: <towertalk@contesting.com>
Sent: Thursday, December 19, 2002 8:16 AM
Subject: [Towertalk] Stacking 10m yagi and multiband yagi
> 'ello,
>
> Our radio club has a 4 element yagi for 28MHz on the
> top of a building.
> We are going to put up a multiband yagi, (C3/C3E...)
> on the same mast. It can only be a few meters above or
> below it.
>
> What will happen about the interaction of the 28MHz
> elements ?
> Should we turn the beams 90° to each other?
> Then what about the interaction of the boom and the
> elemants.
>
> Would it be better to mount the "C3" above the
> existing yagi or below it?
>
> Merci
> F6KCP
> Favieres Radio Club.
>
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