Radio communication apparatus for rapidly knowing whether the ap

Details Radio communication apparatus for rapidly knowing whether the ap Radio communication apparatus for rapidly knowing whether the ap

1990-07-18

1992-09-15

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

3403111, H04B 700

Patent

active

051481600

ABSTRACT:
A radio communication apparatus for receiving radio signals at a predetermined period when a power source switch is put in an on state and when the apparatus is in a service area of a base station. A timer circuit times a preselected time interval, substantially equal to the predetermined period, beginning at a time instant at which the switch is turned from an off state to the on state and produces a time-out signal after the preselected time interval has elapsed. Each radio signal carries a synchronization signal and an additional signal. A detecting circuit detects a timing at which a synchronizing circuit is in a synchronized state wherein a timing clock signal produced by a clock generating circuit is synchronized with the synchronization signal. The detecting circuit produces a detection signal when the detecting circuit detects the timing before reception of the time-out signal. When the detecting circuit does not detect the timing before reception of the time-out signal, the detecting circuit produces the time-out signal as a non-detection signal. An announcing arrangement announces in response to the detection signal and the non-detection signal whether or not the apparatus is in the synchronized state.

REFERENCES:
patent: 4916728 (1990-04-01), Blair
patent: 4996715 (1991-02-01), Marui et al.
patent: 5049875 (1991-09-01), DeLuca et al.

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