POWER SUPPLY

TM 11-7440-232-12 /NAVELEX 0967-LP-275-5010

POWER SUPPLY

·Power supply (PIN 900-44751-01) consists of a

chassis and a printed circuit card which plug into a jack

in the modem shelf. On the front of the chassis is an

on-off switch, pilot lamp, and ac line fuse. On the PCC

module are three potentiometers and three test jacks

which are used for adjusting the output voltages.

·The 01 Option provides regulated +12, +4, and

-12 volts from an ac source. The 02 option provides the

same outputs as the 01 option, plus an alarm contact

closure if any of the supply voltages fail.

· The power supply supplies power to all the

modules. The power supply has one operable POWER

switch and one POWER indicator.

DIGITAL DATA TRANSMITTER

· Digital Data Transmitter (PIN 900-44752-01)

consists of a printed circuit module which plugs into the

modem shelf. All operating controls and test pin jacks

are on the front panel. The operating speed of the

transmitter is determined by the two position BIT RATE

switch on the front panel.

· The digital data transmitter accepts serial

binary data at 1200 or 2400 bits per second and an

accompanying clock signal, and produces a

synchronous fm output for transmission over a vf path.

It supplies a square wave output at the desired bit rate

to the transmitter clock. It, also, contains a generator

that provides test signals for checking system operation.

· The test pattern generator facilitates system

alinement and maintenance, and eliminates the need for

other data generators. This circuit produces four types

of test signals that result in a transmitter output of

steady 1200 Hz, steady 2400 Hz, reversals (alternate

one and zeros), or a random one and zero pattern.

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