Topband: Slightly OT - amplifier noise

[Richard (Rick) Karlquist]

On 3/14/2020 4:07 PM, Jim Brown wrote:
> 
> Another good advantage to the electronic schemes is that you don't have 
> to go outside to rotate them when the noise that's bothering you is 
> coming from a different direction.
> 
> 73, Jim
> 

That is an interesting idea.

I have been trying to figure out how I could phase two verticals
so as to have a null(s) with steerable azimuth, but I'm stumped.
Using EZNEC modeling two 30 foot monopoles 70 feet apart, I can
drive them 180° out of phase and get a figure 8 pattern like
a broadside loop.  I can drive them 135° out of phase and get
a cardioid pattern that doesn't have a sharp null, but rather
rejects everything off the back of the array.  Other angles
produce variations on these patterns, but not a steerable
null.

I could imagine that an array of 3 or 4 or 6 antennas in a circle
might produce steerable nulls.

Am I missing something?

73
Rick N6RK