Items Comprising Power Supply 12-Volt D.c. Input

TM 11-5820-554-12

Output regulation:

7-20. Tabulated Data

Low voltage.................. 290 volts maximum at 170 ma.

Input requirements:

.................................... 265 volts minimum at 210 amperes.

Voltage .........................

11 to 16 volts nominal.

High voltage................. 870 volts maximum at 55 ma.

Current ........................

Up to 30 amperes.

.................................... 695 volts minimum at 230 ma.

Outputs (nominal)

Ripple present on outputs:

Heater...........................

12 volts, 6.0 amperes.

Bias ............................. Less than 0.35 volt peak to peak.

Bias ..............................

-50 to -80 volts

Low B+ ........................ Less than 0.2 volt peak to peak.

adjustable (47,000 ohm

High B+ ....................... Less than 10 volts peak to peak.

load).

Efficiency ............................ Approximately 80%.

Low B+ ........................

265 volts, 210 ma.

Operating temperature ......... -30C. to +60C.

High B + ......................

750 volts, 185 ma.

Humidity ............................. 0 to 95% at +50' C. for 48 hours

7-21. Items Comprising Power Supply 12-Volt D.c. Input

Dimensions

Weight

NSN

Item

Qty

Height

Depth

Width

(lb)

5820 00-034 4233

Power supply 12-volt d.c. input (Collins MP-1)

3 3/4

5 1/4

7 1/2

No. 10 solder lugs

No. 6 solder lugs

Cable clamp

Sheet metal screws No. 12 x 1

30-ampere fuses

with No. 10 lugs (furnished). If the Collins 351D-2 is

7-22. Installation

not used, procure the necessary wire and connect the

a. Select a location in the car for mounting the

car power supply to the studs on the Collins MP-1. If

(Collins MP-1 where it will be cool, clean, and dry as

necessary, the cable may be secured by one of the

possible. Location under the seat or on the passenger

mounting screws and the cable clamp furnished.

side of the fire wall is satisfactory. The sheet-metal

CAUTION

screws supplied require 5/32-inch mounting holes. The

The Collins MP-1 is connected for

shortest possible length of line to the battery is

negative ground when shipped from the

desirable. Under full load, the Collins MP-1 draws

factory. Observe proper polarity or the

approximately 25 amperes. At these current levels,

Collins MP-1 will not operate. See figure

voltage drop through unnecessarily long leads can be

7 for stud strapping details. Be sure to

appreciable.

Coupled with normal variations in

reverse the yellow and blue connections to

primary voltage due to fluctuations in generator

stud-mounted diode CR1 if positive

charging rate, this will have an adverse effect upon the

ground is to be used.

Collins MP-1 output voltage regulation.

7-23. Initial Checks

b. Determine the necessary length of power cable to

Turn the Collins KWM-2/2A MIC GAIN control fully

connect the Collins MP-1 to the equipment which it is

counterclockwise (off) until the switch clicks. Set the

to operate. If the power supply is to provide voltages

OFF-ON-NB-CAL switch to ON. Set the meter switch

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

to PLATE and the EMISSION switch to LOCK. The

the required length of cable from the cable furnished

transceiver is in the receive condition during warm-up,

with the mount. Attach the necessary solder lugs to the

so the meter will read full scale until the filaments reach

loose end of the cable for connection to the terminal

operating temperature. This is normal S-meter action.

board of the Collins MP-1. Five No. 6 lugs are

When the S-meter falls back to a lower value, the

supplied with the power supply (para 7-21). Figure 7-8

circuits will have switched to transmit condition, and

shows proper power supply interconnections to the

the meter will indicate pa plate current. Read the no-

Collins KWM-2/2A and 351D-2 combinations.

signal plate current. It should be approximately 40 ma.

c. Remove the cover from the Collins MP-1, and

If the plate current is other than 40 ma, adjust bias

make connections to the terminal board (fig. 7-8). Two

adjust potentiometer R11 on the power supply printed

lengths of No. 10 wire are furnished with the Collins

circuit board to set the plate cur

351D-2 for connection between the power supply and

battery. Cut these wires to the required length, and fit

7-9