Communications: electrical – Systems – Selsyn type
Patent
1983-01-31
1986-04-15
Caldwell, Sr., John W.
Communications: electrical
Systems
Selsyn type
340696, 307 3, 307 38, 307140, 375 71, H04M 1104
Patent
active
045830738
ABSTRACT:
A solid state remote monitoring transmitter which transmits a 40 bit word that contains status information about a transformer via the secondary of a power distribution network to a central receiver associated with the primary (feeder) cable supplying the transformer. A program card specifies the carrier signal frequency and the identification of the transmitter. Multiple analog inputs are switched through a multiplexer to an A/D converter, the output of which is stored in a shift register to form the 40-bit word. The word is DPSK-coded by clock pulses in synchronism to the 60 Hz zero crossings of the AC power source and amplified by an unregulated power supply which is also powered by the AC power source. The phase transitions of th DPSK-coded word occur at the zero crossings diminishing any transients in the transmitter circuitry which would be caused by the phase transitions.
REFERENCES:
patent: 4101834 (1978-07-01), Stutt
patent: 4216543 (1980-08-01), Cagle
patent: 4270058 (1981-05-01), Schornack
patent: 4300126 (1981-11-01), Gajjar
patent: 4348582 (1982-09-01), Budek
Agovino F. R.
Caldwell Sr. John W.
Hazeltine Corporation
Heim Michael F.
Onders E. A.
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