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Engineer's Log
Mom Proof on WWWI-AM, Baxter, Minnesota

Monday, December 5, 2016:   It was an overcast day after five or more inches of snow at the WWWI-AM, Baxter, Minnesota, transmitter site.
The sun was trying to show through, with little success.
Carl T. "Tom" Jones from Carl Jones Consulting Engineers in Springfield, Virginia, was there to do a MoM (Method of Moments) proof on the night directional antenna for the station.
He measured self impedance of all three towers with the other towers shorted and then disconnected from ground.   

Tom then checked all three tower sample toroidal current transformers to confirm they had the same characteristics and met manufacturer's specifications. 
He also electrically measured sample lines for length and integrity.  Those lines lead from the antenna monitor in the transmitter building to the towers. 

Steve Schuyler, Corporate Engineer for Red Rock Radio, was there to help and observe the process.  Contract Engineer Jim Offerdahl was involved as well.
The antenna phasor system was adjusted to computer-generated phase and ratio numbers, based on the measurement data.  They were very close to the original theoretical numbers
Tom was a happy guy after the system was running correctly. 
The station will no longer need to check monitor points in the directional pattern. 
Nicely done. 
However, the sampling system will need to be recertified after two years, in accordance with FCC Rules.  

The stories go on and on.  Stop in again sometime.  I'll leave the soldering iron on for you. 
Mark W. Persons

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page last edited 12/17/2016