Hydrostatic interface unit

Details Hydrostatic interface unit Hydrostatic interface unit

1991-08-14

1993-07-13

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

Plural transmitters

307315, 307 98, 361 18, 323293, 323352, G08C 1904

Patent

active

052277828

ABSTRACT:
An interface unit is provided for transmitting signals to and receiving signals from several transmitters. The interface unit includes a DC power supply, an active load, and a transmit/receive circuit connected to the first wire of a two wire circuit which transmits signals to and receives signals from the transmitters. The active load is connected in series with the DC power supply between the first and second wire of the two wire circuit and has a first impedance at DC and a second, higher impedance within a frequency range defined by the signals transmitted to and received from the transmitters.

REFERENCES:
patent: 4497033 (1985-01-01), Hernandez et al.
patent: 4988990 (1991-01-01), Warrior

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