[TowerTalk] amplifiers for phased arrays

[Jim Lux]

----- Original Message -----
From: "David Robbins K1TTT" <k1ttt at arrl.net>
To: "'Towertalk'" <towertalk at contesting.com>
Sent: Friday, March 04, 2005 6:39 AM
Subject: Re: [TowerTalk] amplifiers for phased arrays


> Another requirement must be repeatable or adjustable phase and power
> control.  unless you are planning to have an output sample feedback to
your
> phase shift and power divider network to compensate for differences in the
> amps and different loading from coupling to other array elements and
> surrounding stuff externally.
>

Feedback and real time adjustment is a given...  Even in an all passive
array, one needs this.

I'm just looking for "gain blocks" that are available essentially off the
shelf and won't require extensive redesign/modification/extra parts. Sure..
one could gut a MFJ and move the filters outboard with relays, for instance,
or, even, hook a stepper motor up to the band select knob.  There's more
than one tetrode based amp that basically does just this, with motorized
tank components.