December 13, 2002 (Greenville, NC) – Good news for AM stations wanting to combine multiple stations on one tower! There is an alternative to traditional AM diplexers and triplexers – the CombiPole™ by LBA Technology.

This new approach combines a special folded unipole with innovative frequency reject filters to move part of the multiplexing process into the tower. As a result, the filter/ATU networks for each frequency operate at lower stress and are independent of each other. In addition, the isolation required of the networks is lower, reducing costs. An output can even be grounded for maintenance without affecting the on-air operation of the other filter/ATU units. Each frequency is accommodated in a stand-alone module, permitting flexibility in physical configuration and access. Inherently broadband because of the incorporated folded unipole technology, additional broadbanding networks can be easily incorporated for compliance with AM digital requirements.

Because the tower is fed with a modified Tunipole™ folded unipole, the base is grounded for maximum lightning protection. This also permits the simple addition of multiple FM, cellular and other communications antennas without regard for the AM frequencies being combined and no lighting system isolation is needed! These are frequent problems with series-fed multiplexed towers because of the high voltages encountered in conventional multiplexed antenna feeds.

For more information, contact Jerry Brown at LBA Sales toll free at 252-757-0279 – or by email at

10 kW Triplex CombiPole™ for 730 kHz, 1040 kHz and 1300 kHz
10 kW Triplex CombiPole™ for 730 kHz, 1040 kHz and 1300 kHz

About The Author

LBA Group, Inc. has 60 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 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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