Verizon had a big problem at its AM colocation site in Reidsville, Georgia.

The WTNL antenna tuning unit had become unstable, and it was increasingly difficult to adjust to accommodate AM impedance changes caused by new tiers of antennas. An overhaul of the AM antenna system was needed, and AM colocation specialists at Lawrence Behr Associates were called in.

WTNL operates on 1390 kHz with 500 watts, non-directional daytime. They transmit from a 195 foot guyed tower equipped with a folded unipole. The tower supports an FM antenna, as well as several levels of wireless antennas. The original AM antenna tuning unit had far exceeded its life cycle and became ineffective with the installation of additional cellular equipment on the tower.

Central to the renovation was replacement of the ancient WTNL antenna tuning unit. This was done with a new TTM-1 antenna tuning unit designed and fabricated by LBA Technology. The new LBA TTM-1 tuning unit is built to compensate for future cellular growth while providing at least another 20 years of stable service to the radio station and Verizon.

The AM upgrade was carried out by Mike Hayden, iNARTE Certified Engineer, Director of Field Services of Lawrence Behr Associates. He was assisted by Adam Carlson, LBA Field Engineer. The LBA team has carried out many successful AM colocation projects for wireless carriers and tower owners. LBA has become recognized by many as the authority in AM/wireless colocation technology, and has been providing AM and wireless engineering services since 1963.

You can learn more about AM collocation at  http://devlbagroup.com/associates/am-wireless-colocation.php. Contact Mike Britner at mike.britner@lbagroup.co (252-757-0279) for assistance on Wireless FCC compliance and AM collocation.

Before AM overhaul – one FM and lot’s of cell antenna coaxes – cellular shelter on right
Before AM overhaul – one FM and lot’s of cell antenna coaxes – cellular shelter on right
LBA field engineer Adam Carlson checks ATU TTM-1 installation
LBA field engineer Adam Carlson checks ATU TTM-1 installation
Job completed - TTM-1 tuning unit under test – obsolete unit above now out of service
Job completed - TTM-1 tuning unit under test – obsolete unit above now out of service
Mike Hayden Director of LBA Field Services managed the project
Mike Hayden Director of LBA Field Services managed the project

About The Author

LBA Group, Inc. has 50 years of experience in providing RF asset solutions and risk management for industrial and telecommunications infrastructure assets. The group is comprised of LBA Technology, a leading manufacturer and integrator of radio frequency systems, lightning protection, and EMC equipment for broadcast, industrial and government users worldwide; the professional engineering consultancy Lawrence Behr Associates, and LBA University, providing on-site and online professional training. The companies are based in Greenville, N.C., USA.

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