Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1983-04-11
1984-11-20
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 35, 455 77, H04B 140
Patent
active
044843550
ABSTRACT:
A handheld transceiver providing separate selective communications links for transmission and reception on a single carrier frequency by means of independent carrier and sub-audible tone frequencies in transmit and receive modes. A carrier frequency synthesizer functions as a local oscillator and direct FM modulator, and a Continuous Tone-Coded Squelch System (CTCSS) generates and detects sub-audible tones that are transmitted simultaneously with voice information on a carrier wave. The carrier frequency synthesizer and the CTCSS tone detector/generator operate at frequencies independently determined by data stored in a programmable read only memory such that each channel can be programmed to have a unique carrier and CTCSS tone frequency in both transmit and receive modes.
REFERENCES:
patent: 3597690 (1967-09-01), Wycoff
patent: 4142158 (1979-02-01), Belisomi
patent: 4216545 (1980-08-01), Flickshu et al.
patent: 4249165 (1981-03-01), Mori
patent: 4254504 (1981-03-01), Lewis et al.
patent: 4320522 (1982-03-01), Hayes
patent: 4409687 (1983-10-01), Berti et al.
Owner's Manual and Service Manual on Wilson Model No. WH-2510 Radio, 7/81.
Fields Robert N.
Henke Steven P.
Ng Jin F.
Ritron, Inc.
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