Figure 7-1. Express Orderwire Multidirection Unit, Schematic Diagram, (Sheet 2 of 2)

11-5805-451-15

TABLE 1

NOTES:

1. SYMBOL A = 4 WAY/4 WIRE HYBRID P. C. BOARD

ASSY 305-41264.

SYMBOL AT = 5 PAD ATTENUATOR P. C. BOARD

ASSY 368-42056.

SYMBOL AR - VOICE FREQUENCY AMPLIFIER P.C.

BOARD ASSY 368-41965.

2. ALL INPUT AND OUTPUT IMPEDANCES ARE 600

OHMS. TERMINATIONS SHOULD BE USED AS SPECI-

FIED IN TABLE 1.

s. THE TRANSMISSION LOSS THROUGH A 4 WAY/4 WIRE

HYBRID IS NOMINALLY 15 DB. THE VOICE FREQUENCY

AMPLIFIERS HAVE A CONTINOUSLY VARIABLE GAIN

BETWEEN 0 - 30 DB. THE 5 PAD ATTENUATOR SUPPLIES

ATTENUATION LEVELS OF 0 - 31 DB ON A STRAPPABLE

BASIS IN 1 DB STEPS.

4. NUMBERS SHOWN AT PORTS OF FUNCTIONAL BLOCKS

ARE CONNECTOR PIN NUMBERS. AMPLIFIERS AR1A.

AR2A. AR3A. & AR4A HAVE THEIR GAIN ADJUSTMENTS

AT THE TOP AND AMPLIFIERS AR1B, AR2B, AR3B, & AR4B

HAVE THEIR GAIN ADJUSTMENTS AT THE BOTTOM.

a. AMPLIFIER BOARD AR1 IS NOT USED WHEN THE MULTI-

DIRECTION UNIT IS DRIVEN AT TERMINALS TB2-1. TB2-2,

TB6-1 & TB6-2 FROM A SINGLE DIRECTION EXPRESS

ORDERWIRE. ANY OTHER APPLICATION REQUIRING AN

AMPLIFIER BOARD IN THIS POSITION CAN BE IMPLEMENTED

BY REMOVING THE JUMPERS ON J1 AND INSERTING THE

AMPLIFIER BOARD 368-41965.

7-1. E x p r e s s O r d e r w i r e M u l t i d i r e c t i o n

Figure

Unit, Schematic Diagram (Sheet 2 of 2)