04027242 is referenced by 46 patents and cites 5 patents.

A double superheterodyne receiver having a single local oscillator which supplies a signal of a predetermined frequency to a second frequency converter or mixer, where a second intermediate frequency signal is produced for final detection. The local oscillator signal is also supplied via a frequency divider to a phase-locked loop frequency synthesizer as a reference frequency signal. The frequency synthesizer supplies to a first frequency converter or mixer a signal with a frequency selected in accordance with the incoming signal frequency to produce a first intermediate frequency signal, which is subsequently combined with the local oscillator signal in the second frequency converter to provide the second intermediate frequency signal. The invention is disclosed as adapted for a multichannel transceiver.

Title
Double superheterodyne multichannel receiver with a phase-locked loop frequency synthesizer
Application Number
5/625117
Publication Number
4027242
Application Date
October 23, 1975
Publication Date
May 31, 1977
Inventor
Hiromasa Yamanaka
Tokyo
JA
Agent
Woodcock Washburn Kurtz & Mackiewicz
Assignee
Shinto Denki
JA
IPC
H04B 1/40
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