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

  Nott Ltd.

Unipoles to Detune Structures


Click for larger version of the photo If you ever encounter a situation like this, you have a problem.  The water tower was built just 600 feet from the KBUN-AM Radio tower at Bemidji, MN in the winter of 2003. 

Their telephone number is 218-444-1500.  

The water tower and the radio tower are each about 170 feet tall.  The two form a directional pattern for the AM station and the directional problem must be dealt with.

Click on the photo for a larger image.  

Click for larger version of the photo A Nott Ltd. unipole 6-wire detuning system was added to the water tower.  The bottom of the unipole is 14 feet off the ground to prevent vandalism. 

Here, one down-lead wire is tensioned and run into the interior of the tower via a feed-thru insulator.

Click on the photo for a larger image.   

Click for larger version of the photo The water tower, as seen from the outside. 

One of the six down-lead wires is visible on the lower left side of the tower. 

The wires go up to and attach to the bottom of the bowl assembly. 

Click on the photo for a larger image.  

Click for larger version of the photo There is a tuning box in the center of the tower.  Note that there are two wires going to the box from each of six directions.  The top six are connected to the six skirt wires on the outside of the tower.  The bottom six are ground wires leading in from electrical terminals in the wall of the water tower.  These terminals are bonded to the metal rebar in the concrete walls of the water tower.  We had welders bond the rebar during the construction process.  Above the tuning box are four black nylon lines that suspend the tuning box in mid-air in the center of the water tower.

Click on the photo for a larger image.  

The detuning system worked.  This is just another example of M. W. Persons and Associates doing problem solving in the radio broadcast field.   


Find KBUN Radio on the Web at  http://www.kbunam.com 
Their telephone number is 218-444-1500.

  Email Mark Persons:  teki@mwpersons.com    

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page last edited 02/22/2016