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TM 11-5820-222-35/TO 31R2-2TRC68-22
DEPARTMENTS OF THE ARMY
Technical Manual
AND THE AIR FORCE
No. 11-5820-222-35
WASHINGTON 25, D. C., 1 June 1961
Technical Order
No. 31R2-2TRC68-22
RADIO SETS AN/VRC-24 AND AN/TRC-68
BLOCK DIAGRAM THEORY
C
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section I.
Block diagram of radio sets . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II.
3-7
RECEIVER THEORY
2-4
Receiving signal path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section I.
Directional coupler and rf input stages . . . . . . . . . . . . . . . . . . . . . .  10-16
II.
5-7
Uhf injection subunit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-11
III.
17-24
First if. stages, second receiver mixer and second oscillator . . . . . .  25-28
IV.
12-15
V.
Third receiver mixer and third oscillator section . . . . . . . . . . . . . .  29-33
16-18
Audio amplifier subunit and 500-kc if . . . . . . . . . . . . . . . . . . . . . .  34-41
VI.
Squelch and audio output section . . . . . . . . . . . . . . . . . . . . . . . .  42-45
VII.
20-24
25-29
Transmitter signal path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section I.
Low-level stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
II.
48-54
30-34
High-level rf and modulator stages . . . . . . . . . . . . . . . . . . . . . . . . .
III.
55-61
32-35
THEORY OF BROADBAND, CONTROL METERING, POWER
35-39
DISTRIBUTION, AND FREQUENCY SELECTION STAGES
40,41
Broadband reception and transmission . . . . . . . . . . . . . . . . . . . . .  62-65
Section I.
II.
Metering circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  66-76
41-45
B+ and bias distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  77-79
III.
46-48
Power control circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IV.
48-51
Control and frequency selection circuits. . . . . . . . . . . . . . . . . . . .
V.
82-86
51-60
VI.
Power supplies and minor components . . . . . . . . . . . . . . . . . . . . .
87-91
60-69
TROUBLESHOOTING
Section I.
General troubleshooting procedures . . . . . . . . . . . . . . . . . . . . . . .
92-94
System application troubleshooting . . . . . . . , . . . . . . . . . . . . . . .
II.
71-75
Unit troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  97-105  75-130
III.
REPAIRS AND ALIGNMENT
Removal and replacement of subunits . . . . . . . . . . . . . . . . . . . . . 106-120 131-136
Section I.
II.
Repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121-127 136-169
Alignment . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 128-137 170-179
III.
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . .. . . . . . . . . . . . . . . . 138-141 179-181
IV.
FINAL TESTING
Section I.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 142,143
II.
Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144-161 181-207
REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
209
INDEX . . . . . .
............ .........................................
1


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