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Radio
Broadcast Technical Consulting and Sales |
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Nott Ltd. |
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Unipoles to Detune Structures |
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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 150 feet tall. The two form a directional pattern for the AM station and the directional problem must be dealt with. |
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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. |
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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. |
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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.
The detuning system worked. This is just another example of M. W. Persons and Associates doing problem solving in the radio broadcast field. |
page last edited 03/22/2008
