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Radio Broadcast Technical Consulting and Sales
10032 Island Drive, Brainerd, MN  56401


Engineer's Log of Mark W. Persons
Power Transformer Replacement

November 10, 2009:  With the help of Dave Cox from WJJY Radio in Brainerd, MN, a good used 500-pound power transformer was loaded on a trailer from Brainerd General Rental.  This particular trailer was ideal because the bottom is expanded metal, which made it possible to bolt the transformer down to keep it from moving around during transit.  Large straps were also used to keep the transformer from tipping over.  This low trailer with tail gate worked quite well for getting the transformer out of one building and into another.
Some 100 miles north, Mark Anderson from KBHP Radio in Bemidji, MN, is handling a failed transformer. 

It was just removed from a Collins/Rockwell/Continental 20 KW FM transmitter.

A close-up of the center pole of this 3-phase power transformer revealed there had been a small fire on the high voltage winding. 

These things happen when you have 10,000 volts on the secondary side of a transformer.    

Mark is lying on the concrete floor while bolting the replacement transformer down to the bottom plate in the transmitter.  

This prevents it from "walking around" and touching other components.


Here is the transformer wired and ready to go. 

Cross your fingers...let's turn the power on!

Success....the transmitter ran fine again.  All in a day's work.  

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

 Questions?  Email Mark Persons:  teki@mwpersons.com     

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page last edited 02/19/2016