CHAPTER 4.10 FM Combining Systems
ROBERT A. SURETTE
Shively Labs Bridgton, Maine
INTRODUCTION
Transmitting several frequencies from a single broadband antenna system requires the use of a combining system, or combiner, composed of radiofrequency (RF) filters and interconnecting transmission line. In general, a combiner can be categorized as one of two types: branched (star point) or balanced (constant impedance). Any of these types may employ band-reject (notch) or bandpass filters. This chapter discusses the use of filters, other components in FM combiners, and the hardware used to combine an in-band-on-channel (IBOC) digital signal into an analog signal.
APPLICATIONS
For years, both the FM spectrum and the FM channel were straightforward and ...
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