[BC] Total Power Of An AM Directional Array

[Dana Puopolo]

In the mid '70's, construction of a multi story apartment building less then
150 feet from the WMEX 1510 array made re-proofing both patterns necessary.
The night 5kW two tower pattern came in fine, but the daytime 50 kW two tower
pattern would not come in until we used the third (night) tower as a parasitic
(the tower bearings day and night were different so three towers were on
site).

-D

------ Original Message ------
Received: Wed, 04 Apr 2007 10:57:17 PM EDT
From: dhultsman5 at aol.com
To: broadcast at radiolists.net
Subject: Re: [BC] Total Power Of An AM Directional Array

The old WMAK 1300 kHz. in Nashville had a 5 tower in-line array.  Originally
tower number 1 was a negative tower and the low power in it was absorbed by a
dummyload and not fed back into the phasor.  It was very dfficult to control. 
Carl Kowalski decide to add a transmission line and install the phase adjust
in the building instead of in the tower and did away with the dummy load at
the tower.  It made the array a little easier to control and a heck of a lot
easier to monitor.   I have seen several towers parasitically excited.
 
 
One that was written up by a gentlemen from Carl Smith and associates was the
800 kHz. 500 kW in Bonaire.  The station array employed three or four towers, 
Only one was excited.  The other were parasitically excited and the station
could operate ND or two DA modes depending on coil settings in each of the
towers.
 
Dave Hultsman
Continental Electronics .
Birmingham, AL
Tel Toll Free (888) 822-1078
Fax (205) 822-6441
 
 
-----Original Message-----
From: shnewman at alaweb.com
To: broadcast at radiolists.net
Sent: Wed, 4 Apr 2007 7:55 PM
Subject: Re: [BC] Total Power Of An AM Directional Array


Hi Stan... 
 
Could you refresh my memory on this. Somewhere in the back of my mind I was
told (maybe this is one of those urban myths) having a parasitic tower was
illegal?? Is there any truth to that. From what you've said here that's not
the case, eh? 
 
Steve 
----- Original Message ----- From: "Stan Tacker" <stacker at krvt.com> 
To: "'Broadcasters' Mailing List'" <broadcast at radiolists.net> 
Sent: Wednesday, April 04, 2007 7:45 PM 
Subject: RE: [BC] Total Power Of An AM Directional Array 
 
> 
> 
> 
>>And some towers are almost parasitic! (LOL) You jogged my memory about one 
>>that was designed in the SF bay area by the late Al Towne. (the old 
>>KOBY/KKHI 3 tower array south of San Francisco in Blemont. Bob Orban knows 
>>it well. I think it's in his backyard. :) 
> 
>>Steve 
> 
>>Steve Newman 
> 
> Almost parasitic is an understatement. I used to have a three tower >
in-line 
> array with only two "driven" towers. The third tower network terminated > to

> ground with a variable inductor controlled by a stepper motor for remote 
> tuning. I understand that quite a few of those were designed back in the 
> 40's and earlier. 
> 
> Stan 
> 
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