Sep 22, 2010 – LBA Technology has designed, built and delivered to Taiwan an advanced technology AM Triplexer system  for Broadcasting Corporation of China. This is the second successful multiplexer project undertaken by the North Carolina company for the BCC.

The project is especially notable because the tower site posed an engineering challenge. The AM triplexer had to be incorporated into an electrically short tower in the middle of a lake, with the tower base and triplexing equipment fitted snugly on a small platform area 30 feet above the water.

LBA technical staff with unique 10 KW triplexer for Broadcasting Company of China - tested and ready to go!
LBA technical staff with unique 10 KW triplexer for Broadcasting Company of China - tested and ready to go!

Half a world away from Taiwan, LBA senior engineer Marvin Brewer simulated the electrical requirements by NEC modeling. He specified installation on the tower of an LBA Technology Q-Cage™ broadbanding kit to improve matching impedances and then designed an AM triplexer system in three independent ATU – RF filter combinations. The system’s weatherproof cabinets were clustered around the base of the tower base in a way that allows full access to them for maintenance. LBA Technology shop experts fabricated, adjusted and tested the entire system.

As its name implies, an AM triplexer allows the simultaneous use of three medium wave AM transmitters on a single antenna. AM triplexers combine an antenna tuning unit and a rejection filter section for each frequency, which effectively sort out and pass through desired frequencies and reject undesired frequencies. The AM triplexer system for BCC was designed for 531kHz, 648kHz and 963kHz, and 10,000 watts power at 125 percent modulation for each frequency.

The AM triplexer system was delivered through Broadcast Electronics in Quincy , Ill., an  international transmitter manufacturer. LBA has partnered with the Illinois company on projects in the U.S., the Middle East, Far East Asia, Afghanistan, Iraq and the United Kingdom.

LBA Technology routinely custom-engineers multiplexers so broadcasters can feed multiple transmitters to common antenna systems. It is a cost-effective way to minimize the physical plant requirements of AM broadcast stations.  With almost 50 years of experience, LBA provides a wide variety of AM broadcast antenna solutions for all power levels… worldwide.

About LBA Technology, Inc.

LBA Technology is a leading manufacturer and integrator of radio frequency systems, components and test equipment for broadcast, industrial and government users worldwide. With Lawrence Behr Associates, Inc., the company is a unit of LBA Group, Inc, which has nearly 50 years experience in providing support for infrastructure assets of the wireless telecommunications industry. The companies are based in Greenville, NC.

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 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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