Full duplex RF repeater/base station providing microprocessor-controlled simultaneous CTCSS tone encode/decode
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United States of America Patent
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-
Jul 5, 1994
Issued Date -
N/A
app pub date -
Jun 1, 1993
filing date -
Oct 12, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A microcomputer within a duplex RF transceiver operates in an interrupt-driven manner to simultaneously encode and decode CTCSS signalling (with one microcomputer interrupt service routine being devoted to CTCSS encode, and another microcomputer interrupt service routine being devoted to CTCSS decode). Such encoding and decoding of CTCSS signalling is accomplished using minimal external control hardware (e.g., two flip flops and an inexpensive conventional multipurpose counter/timer chip). The resulting arrangement is inexpensive, reliable and requires only a few components in addition to the appropriately programmed microcomputer in order to provide simultaneous encoding and decoding of CTCSS signals in a full duplex RF transceiver context.
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