[TowerTalk] am towers

[Jim Brown]

On Sun, 15 Feb 2009 13:01:45 -0500, jim Jarvis wrote:

>An AM array proof of performance has 20 radials, with 10 readings  
>each... out to a distance
>of 8-10 miles.    Lot of labor involved.

The number of radials depends on the complexity of the pattern. A complex 
pattern may be protecting stations in a half dozen or more directions, 
each with a null.  In essence, the proof must confirm that the nulls 
aren't being filled in. Yes, a LOT of labor. 

In my college days, I worked for Pete Johnson, an AM broadcast consultant 
who designed AM arrays. Got REALLY good at using a slide rule to do phasor 
calculations. This was in 1962, LONG before computers. 

73,

Jim K9YC