chapter 2. FUNCTIONING OF EQUIPMENT

TM 11-6130-385-34

FUNCTIONING

EQUIPMENT

2-1. Dc Power

2-3. Modulator Function

(fig. 2-1)

The modulator boards receive the high frequency

square wave and process it through a ramp generator

D c power is applied to the input filter which at-

and a square wave generator. These inputs are

t e n u a t e s ripple voltage from the power source and

processed through the modulator circuit and a data

eliminates radio magnetic interference emitting from

the power supply. Power from the input filter is fed

g e n e r a t o r circuit to produce the data output. The

to a capacitor bank which provides power to the dc

m o d u l a t o r boards also receive a 400-Hz sine wave

voltage regulator board to obtain regulated dc

f e e d b a c k from the output filter.

supply for the various circuits throughout the unit.

2-4. Overcurrent Sense and Foldback Function

2-2. Oscillator Function

The A phase modulator board provides an over-

current sense and foldback circuit to limit the output

The oscillator signal is applied to countdown circuits

short circuit current. This circuit folds back the

to develop high frequency square waves and 400-Hz

current to a safe level if overloads persist in excess of

sine waves. The square and sine waves are directed

5 seconds.

t o the modulator boards and the sine wave is also

c o n d u c t e d to the recovery drive circuits.

2-1.

Simplified

block

diagram

2-1