Installation - TM-11-5820-554-120051

TM 11 - 5820-554-12

7-15. Items Comprising Power Supply PP -4 765/GRC-1 59(V)

Dimensions

Weight

NSN

Item

Height

Depth

Width

(lb)

6130 00-926-7805

Power Supply PP -4 765/GRC-159(V) 24-volt d.c. input

5 3/4

7 3/4

11 3/8

(Collins 516E-2)

fied to accept this change of polarity.

7-16. Installation

(fig. 7-7)

Wrong polarity of connections will

a. Select a location in the vehicle, boat, or aircraft

destroy all four transistors in the power

for mounting the PP-4765/GRC-159(V) where it will

supply. As an added precaution, remove

be cool, clean, and dry as possible. Location under the

the fuses before making connections to

seat or on the passenger side of fire wall is usually

the terminal board.

They may be

satisfactory.

DO NOT mount it in the engine

replaced after all connections have been

compartment.

made and checked. After the power cable

b.. Determine the necessary length of power cable

and the 28-volt leads are connected,

to connect the power supply to the equipment. If the

replace the terminal board cover.

power supply is to supply voltages to the Collins

d. Before use with the Collins KWM-2/2A, adjust

KWM-2/2A and the Collins 351D-2 is used, cut the

the bias voltage as follows:

required length of cable from that furnished with the

(1) Set the MIC GAIN control fully counter-

mount. If the Collins 3511) 2 is not used, use a power

clockwise

connecting cable such as Collins 440E-1. Wire color

(2) Set the EMISSION switch to LOCK.

code and pin-terminal interconnecting information is the

(3) Set the meter switch to PA PLATE.

same for the Collins 440E-1 as for the power cable

(4) Set the OFF-ON-NB-CAL switch on.

furnished as part of the Collins 351D-2. Other

(5) After a 2-minute warm-up period, the no

connections to the Collins KWM-2/2A may be made as

signal plate current, as monitored on the meter, should

shown in figures 3-1 through 3-6.

be approximately 40 ma. If it is not 40 ma, adjust

c. Remove the cover from the PP-4765/GRC-

BIAS ADJUST potentiometer R19 on the power supply

159(V) power supply terminal board, and make con-

until a 40 -ma reading is obtained.

nections to the terminal board (fig. 7-7).

7-17. Operation

CAUTION

1. DO NOT connect the PP-4765/GRC-

Operation of the power supply is controlled from

159(V) power supply to a 28-volt d.c.

switches and relays in the equipment for which the PP

source having transient voltages in

4765/GRC-159(V) supplies power. No other operating

excess of 50 volts. To do so will

procedures are required.

destroy the switching transistors.

7-18. Operator's and Organizational

2. Be sure to observe proper polarity of

Maintenance Instructions

the battery when making connections

Operator's maintenance instructions are covered in

to the 24-volt terminals of the power

paragraph 7-26 and 7-27. Organizational maintenance

supply DO NOT connect the PP-

instructions are covered in paragraph 7-28 and 7-29

4765/GRC-159(V)to a system which

has a positive ground unless the power

supply has been modi-

Section IV. POWER SUPPLY 1 2-VOLT D.C. INPUT

used, it includes a power cable for connection between

7-19. Description

the Collins KWM-2/2A and the Collins 351-2

The Collins MP-1 converts 12-volt d.c. energy from an

combination and the Collins MP-1 supply. If the

automobile storage battery to B+ and bias voltages

Collins 351-2 is not used, use the Collins 440E-1 cable

necessary for operation of mobile amateur equipment

to connect the Collins MP-1 to the Collins KWM-2/2A.

such as the Collins KWM-2/2A. The Collins MP-1 can

be used in car, boat, or plane having a 12-volt d.c.

power system. If the Collins 351-2 mobile mount is

7-8