Mobile communication apparatus

Details Mobile communication apparatus Mobile communication apparatus

1987-07-13

1989-03-28

Blum, Theodore M.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455260, 455314, 455316, 455 67, 331 17, H03D 324, H04B 1700

Patent

active

048171972

ABSTRACT:
Local frequency which is subject to fluctuate in a mobile subscriber set is locked to stable transmit frequency of a base station. A mobile subscriber set (FIG. 3) for angle modulated signal has a frequency mixer (3.6, 3.9), for converting wireless receive frequency to an intermediate frequency by using local frequency (F.sub.L1, F.sub.L2), a limiter (3.11) for limiting amplitude of intermediate frequency signal, a discriminator (3.12) for demodulating angle modulated signal, a standard oscillator (3.1) by using a quartz crystal oscillator and a synthesizer (64) for providing local frequency for said mixer (3.6), a digital frequency counter (3.14) for measuring intermediate frequency, and control means (3.16) for adjusting said standard oscillator (3.1) depending upon error of intermediate frequency measured by said counter (3.14).

REFERENCES:
patent: 2898455 (1959-08-01), Hymas et al.
patent: 3230453 (1966-01-01), Boor et al.
patent: 4457006 (1984-06-01), Maine
patent: 4628518 (1986-12-01), Chadwick et al.
patent: 4670889 (1987-06-01), Hewitt
patent: 4696056 (1987-09-01), Morita

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