FREQUENCY SYNTHESIS IN TWO-WAY COMMUNICATIONS
1980
Frequency synthesis, accomplished by using one or more reference oscillators to produce a multiplicity of output frequencies different from the reference frequencies, is used in radio communication services which are channelized into equally spaced assignments. Usually two reference frequencies are mixed and the output filtered to exclude one of the two resultant mixer outputs. Introduction of synthesizers to railroad radio can mark the beginning of the end of conventional crystal controlled frequencies.
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