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Section V. ORGANIZATIONAL MAINTENANCE INSTRUCTIONS
Up
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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Power Transformer Connections


TM 11-5820-554-12
CHAPTER 11
AMPLIFIER, RF AM-3979/FR-93
Section I. INTRODUCTION
11-1. General
Type of service ..........................
Ssb-continuous voice modulation.
This chapter describes Amplifier, RF AM-3979/ FRC 93
Cw-50
percent
duty
(Collins 30L-1). This amplifier is used to increase the
cycle(continuous
keydown
conditions not to exceed 30
output of the AN/FRC-93 to 1,000 watts and allows
seconds duration).
communication over greater distances. It is portable,
Plate power input.......................
Cw-1,000 watts.
but can be used in a mobile station by mounting it on a
Ssb-nominal pep input of 1,000
Collins 351E-4 mounting plate.
Case, Electrical
watts with speech. Third order
distortion products at this level
Equipment CY-6197/ GRC-159 is used for carrying the
are at least 30 db down from
amplifier in port" able applications.
signal.
Drive power requirememts
70 watts.
230 volts a.c. 10%, 3 wire, single
Primary power requirements .....
11-2. Tabulated Data
phase,
at
7.5
amperes
maximum, or 115 volts a.c.
10%
at
15
amperes
Frequency range ........................
3.6 to 29.7 MHz covering all
maximum, 50 to 400 Hz.
amateur bands.  By retuning
Operation
from
a
line
input coils as necessary, the
frequency other than 50 to 60
following
general-coverage
Hz requires an auxiliary 60-Hz
bands may be covered:
supply for a fan motor.
Input impedance ........................
52 ohms.
Frequency
Total coverage
Output impedance .....................
52 ohms unbalanced with vswr not
band
to exceed 20 to 1 on the
3.5 MHz
3.4 to 5.0 MHz
amateur bands.
7.0 MHz
6.5 to 9.5 MHz
Noise level
40 db down from output signal
14 MHz
9.5 to 16.0 MHz
with 1 kilowatt single-tone
21 MHz
16.0 to 22.0 MHz
input.
28 MHz
22.0 to 30.0 MHz
Harmonic output .......................
All harmonics at least 40 db down
Mode..........................................
Ssb or cw.
from output signal.
11-3. Items Comprising an Operable Amplifier, Radio Frequency AM 3979/FRC-93
NSN
Item
Dimensions
Weight
Height
Depth
Width
5820-00-082-4081
Amplifier, Radio Frequency, AM-3979/FRC-93 (Collins 30L-1)................
6 9/16
13
14 3/4
38
Section II. INSTALLATION
11-4. Unpacking
Carefully remove the packing material. Examine for
amplifier against table 11-1.  Lift the amplifier
visible damage. If the amplifier has been damaged
cabinet lid.  Loosen the 10 screws in the RF
in shipment, refer to paragraph 1-3. Check tuning
compartment cover, slide it forward, and lift it off
controls and switches for freedom of action. Check
Remove the packing material around the tubes.
the equipment included with the
Replace the cover and tighten the screws. Lower the
lid.
11-1


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