[TowerTalk] Variable phasing was: Re: [CQ-Contest] Stacking on separate towers, take off angles?

[Jim Lux]

On 3/18/13 3:45 AM, Pete Smith N4ZR wrote:
> I've been trying to remember specifics about a phasing system that was
> sold commercially for a few years back in the 70s or 80s.  It used two
> verticals and, depending on settings on the desktop, could vary the
> phasing of the verticals over a wide range, producing all sorts of
> patterns.  Anyone recall, or even have one in the basement?
>
>
There was a device like this in one of the Antenna Compendiums. It had a 
transformer power splitter and a phase shifter in series with one of the 
verticals. You could switch the phase to one of the elements by 180, so 
the idea is that you could null on the desired signal, then flip the 
switch and the lobe faces towards it.