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| It all started in the summer of 2007 when CTC (Consolidated Telecommunications Company) built a 180-foot wireless Internet tower in the Brainerd Industrial Park just 0.87 miles (1.4 KM) west of the KLIZ-AM 3-tower night directional antenna system. KLIZ-AM operates on 1380 KHz, which makes the Consolidated tower almost exactly one-quarter wavelength in height. Needless to say, the new tower became a significant re-radiator of the KLIZ-AM signal. It was picking up the KLIZ signal and re-transmitting it in a fashion that raised the field intensity levels in the nearby AM directional monitor points. This is a common problem that can be solved. |
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Here is Bill Stroot,
Project Manager at
CTC, smiling after the tower was successfully detuned using a
Nott Ltd three-wire unipole
detuning system and the technical expertise of M. W. Persons and
Associates. The tower contractor was Trillium Development from Sartell, MN. We tried something different on this one. The three near-vertical 145 foot unipole wires are on the "inside" of the tower rather than the outside. This was made possible because the tower is a self-supporting structure that is 22 feet across at the base. |
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The unipole detuning box
sits at the center of the inside of the tower.
The vertical unipole wires turn horizontal at 8 feet above the ground and
meet just above box. The project when very smoothly and it worked as predicted to detune the tower at 1380 KHz. |
page last edited 01/29/2011
