[TowerTalk] 4 SQ WX0B box

[Jan Erik Holm]

Interesting Tom but it doesn´t adress what I wrote
under this subject. Guess somehow things got mixed up.

73 Jim SM2EKM
----------------

Tom Rauch wrote:

> power is carried in the feedline.  In an ideal system, you'd
> have the
> reactance at the antenna, so that the feedline is at 50
> ohms, and all the
> box needs to do is generate the right phases.  Of course,
> the matching
> network at the antenna would then need to have multiple
> values, since the
> feedpoint impedance changes with the array steering
> direction.  And, it
> would be quite "challenging" to tune up (broadcast antenna
> engineers earn
> their pennies doing this).>>
> 
> That is like a system I built for someone else.
> 
> Each outer antenna tower has a matching system for four
> impedances. The common tower has a matching system for three
> impedances (omni) (N E S W patterns) and (NE SE NW SW
> patterns).
> 
> The ATU's always present a 50 ohm load to the lines, and the
> main phasing box (about five feet tall and four feet wide)
> in combination with the ATU's has about 35-40 edge wound
> inductors, around one hundred capacitors, and probably 30 or
> so relays. A partially completed photo at:
> 
> http://www.w8ji.com/images/W8JI%20site/phasor1.jpg
> 
> My own personal system is on plywood with copper overlay as
> a ground plane, and uses transmission lines and T networks
> for delay.  Most of the components are just glued down.
>