[Elecraft] Antenna Separation for Diversity

[Tom W8JI]

Brett,

No one can answer that question for you, because both antennas are 
unpredictable in nearfield performance. Also the layout of the antenna and 
what is around, under, and between the antennas is very important.

With such a large soup of unknowns, plus there might be other transmitters 
on site (?), the only way to really know is to try it.

If you had a normal dipole and wanted interaction to a vertical of known 
efficiency I have all that data. One thing I learned is minimum coupling 
from a good dipole to a good vertical was with the dipole BROADSIDE to the 
vertical, not at right angles as I assumed without thinking.

The problem is the Carolina Windom is nothing like a dipole and not nearly 
as predictable as a dipole for nearfield or close farfield coupling, and 
that goes on top of the other variables that are bad enough on their own.

Maybe you should go to an antenna forum, like on eHam or QRZ, armed with the 
information of the safe signal level the K3 will tolerate. Other than the 
safe signal level, this is really an antenna theory question and a good 
answer would be too complex for a radio reflector.

73 Tom

- Original Message ----- 
From: "Brett Howard" <brett at livecomputers.com>
To: "elecraft" <elecraft at mailman.qth.net>
Sent: Thursday, June 24, 2010 5:14 AM
Subject: [Elecraft] Antenna Separation for Diversity


> So I know I'm going to shoot for as wide as I can get things... But for
> two main antennas on a k3 one being a Carolina Windom and the other
> being a 43 foot vertical.
>
> How much separation would one expect to be needed in order to prevent
> the COR's from switching during TX @ 100Watts?
>
> ~Brett (N7MG)
>
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