[BC] Short AM Tower

[Alan Alsobrook]

I'll take a guess that it's skirt fed and a self supporter.  Also that 
upon matching the tower with the skirt tapped to the highest point the 
feed point impedance is about 10 Ohms or a bit less. If this is the one 
I'm thinking of (a bit east of you) I had it set up and matched out very 
nicely to 50 J0 but the coils needed to be larger since they had an 
excessive amount of heat loss.

Another thing to look at is Harris takes a 5 ohm PA output and bumps it 
it to 50 ohms fairly efficiently in the Gates series transmitters. If 
you can go one way, just reverse the circuit and you can go the other.

Optionally a Hi Pass Pi network may provide a lower loss network in this 
application.

There are several ways to make it work. Several of which I have 
discussed on site.

Larry Lamoray wrote:

> Have a client trying to use a 100 ft tower for AM on 1230. 200 feet is 
> prohibited by local ordinance. :-((


-- 
Alan Alsobrook CSRE AMD CBNT
St. Augustine Fl. 32086 904-829-8885
aalso at Bellsouth.net