Bob Surette will discuss the causes and the effects of, and the solutions for SPECTRUM REGROWTH in FM IBOC transmission systems.

The term spectral re-growth was coined to describe intermodulation products (spurs) generated when a digital transmitter is added to an analog transmission system.

There are two sets of spurs that have to be dealt with. The first set of spurs is generated within a digital transmitter as the two sidebands interact The second set of spurs is also generated in the digital transmitter and is a product of each digital sideband combining with the analog signal. The signal level of these spurs is a function of the isolation between the analog and digital transmitters.

Bob has been with Shively Labs since 1981. Bob graduated from Lowell Technological Institute, Lowell, Massachusetts in 1973 with a Bachelor of Science degree in Electrical Engineering. He has been directly involved with design and development of broadcast antennas, filter systems and RF transmission components since 1974. Bob also worked, for a short period of time, with Dielectric Communications. Bob is currently an Associate Member of the AFCCE and a Member of IEEE. He has authored a chapter on filters and combining systems for the latest edition of the CRC Electronics Handbook and for the 9th Edition of the NAB Handbook.