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National Association of Broadcasters Engineering Handbook, 11th Edition by Garrison C. Cavell

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Chapter7.11

Synchronous AM Broadcasting

Stephen F. Smith

Consultant

AM transmitter carrier synchronization using low-cost, off-the-shelf GPS timing-reference hardware has the potential to increase the effective coverage of co-channel AM stations with overlapping contours by eliminating beat frequencies and the associated noise artifacts that serve to make the reception in the fringe areas unlistenable, both in daytime and nighttime scenarios. This chapter will address the basic carrier synchronization system design and will present results, including field measurements, that will serve to demonstrate the improvements in reception quality, both static and mobile, in the region of overlapping fringe-area co-channel contours that can be realized ...

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