Portable test receiver for remote monitoring system

Details Portable test receiver for remote monitoring system Portable test receiver for remote monitoring system

1992-06-24

1994-05-31

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

340310A, 375 4, H03K 904

Patent

active

053175980

ABSTRACT:
A portable test receiver for field maintenance of a remote sensor monitoring system for underground transformers. The apparatus uses a phase locked loop method to demodulate the DPSK modulation of the remote monitor transmitter. The apparatus is battery operated and easily moved to permit monitoring of spot networks and critical locations for maintenance work. The apparatus features a single software driven display offering good visibility with low current drain. Decoding the transmitter signal is accomplished by using the crystal oscillator circuit of the transmitter is used to generate a reference which is compared to the transmitter signal to detect phase flips. Since the apparatus is battery-powered, there is no AC power to provide "zero" crossing points of the monitored transmitter. Bit timing is provided by taking advantage of the nulls at the 60 cycle "zero" crossings found in the transmitter signal.

REFERENCES:
patent: 4583073 (1986-04-01), Stolowicki
patent: 4908600 (1990-03-01), Martinez

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