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Figure 6-2. Noise blanker, block diagram.
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TM-11-5820-554-12 Radio Set AN/FRC-93(V)1 AN/FRC-93(V)2 AN/FRC-93(V)3. AN/FRC-93(V)4 AN/FRC-93(V)5 AN/FRC-93(V)6 AN/FRC-93(V)7 Manual
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Items Comprising Power Supply PP-3990/FRC-93


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
1
7-1


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