CHAPTER 7. POWER SUPPLIES

TM 11-5820-554-12

CHAPTER 7

POWER SUPPLIES

Section I.

POWER SUPPLY PP-3990/FRC-93

a.c. power source, suitable antenna, microphone, and

7-1. Description

key), and operated as a portable station. A small

The PP-3990/FRC-93 (Collins PM-2) is a lightweight

speaker is included in this power supply. Adequate

a.c. power supply. It is part of a complete high-

space is provided in the Collins CC-2 for small

frequency, single sideband station in a suitcase-sized

accessories.

carrying case. The complete station consists of the

7-2. Tabulated Data

Collins KWM-2/2A, the PP-3990/ FRC-93 and Case,

Input requirements

110 or 220 volts, 50 to 400 Hz,

Electrical Equipment CY-6197/ GRC-159 (Collins CC-

4 or 2 amperes.

2) (fig. 7-1). The power supply converts 110- or 220-

Output (nominal):

volt a.c. power to suitable voltage and current values

Heater power

6,0 to 6.3 volts a.c. at 11 amperes.

for operation of the Collins KWM-2/2A. It clamps to

Low voltage B+

275 volts at 175 ma. 260 volts at 210 ma.

the rear of the Collins KWM-2/2A so that both

High voltage B+

700 volts at 230 ma (key down

intermittent).

transceiver and power supply may be packed in the

Bias voltage

-50 to -90 volts, no current

lightweight carrying case for portability.

The

requirements.

assembled combination may be lifted together from the

Collins CC-2, set on a desk or table (connected to an

PM-2

PLASTIC LINER

KWM-2/2A

COVERED

HINGE

A-C CORD

AND ADAPTER

CC-2

CARRYING CASE

Figure 7-1. PP-3990/FRC-93 packed in (Collins CC-2) carrying case

7-1