TM 11-251 Radio Set 555-A, 1944
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- Publication date
- 1944-09-25
- Usage
- Public Domain Mark 1.0
- Topics
- WWII, World War, 1939-1945, United States. -- Army -- Handbooks, manuals, etc, World War II, United States. Army, Radio direction finders -- United States -- Handbooks, manuals, etc., Field Manual, Technical Manual, Radio direction finders, Armed Forces
- Publisher
- Washington, D.C. : War Department
- Collection
- wwIIarchive; additional_collections
- Language
- English
TM 11-251 Radio Set 555-A, 1944-09-25
TABLE OF CONTENTS
Paragraph
SECTION I. Description.
General 1 1
Radio Set SCR-555-A, components with weights and dimensions 2 2
Frequency coverage 3 6
Power source 4 6
Power input 5 6
Power output 6 6
Description of main components 7 6
Description of auxiliary components 8 10
II. Installation and operation.
Selection of site 9 13
Initial procedure 10 15
Installation 11 15
Orientation 12 39
Radio Transmitter BC-655-A 13 41
Operation of Radio Set SCR-555-A 14 43
Initial adjustment of radio direction finder 15 43
Operation as figure-8 aural-null radio direction finder 16 45
Operation as switched-cardioid left-right radio direction finder 17 46
Operation of headsets and microphone 18 47
Operation precautions 20 48
III. Functioning of parts.
Principle of switched-cardioid radio direction finder 20 49
Antenna system 21 56
Adcock r-f amplifiers 22 57
Vertical amplifiers 23 58
Square wave oscillator 24 58
Negative pulse rectifiers 25 59
Synchronous voltmeter 26 60
R-f oscillator and mixer 27 60
I-f amplifier 28 61
C-w oscillator 29 62
Second detector, automatic volume control, and bearing amplifier 30 62
Output stage 31 63
Controls 32 64
Meters 33 66
Power Unit PE-155-A 34 66
Telephone equipment 35 67
Radio Transmitter BC-655-A 36 67
IV. Maintenance.
Servicing 37 69
Trouble and remedy chart 38 70
Alignment procedure 39 71
Replacement of coils 40 74
Balancing adcock antenna transformers. 41 74
Dynamotor unit 42 75
Antenna system 43 79
Performance data 44 80
Normal voltage readings 45 80
Parts location detail 46 80
Operational inspection of Radio Transmitter BC-655-A 47 80
Disassembly of Radio Transmitter BC-655-A 48 81
Routine inspection and overhaul of Radio Transmitter BC-655-A 49 82
Location and remedy of faults in Radio Transmitter BC-655-A 50 83
Typical vacuum-tube socket measurements 51 83
Replacing defective components of Radio Transmitter BC-655-A 52 84
Over-all performance test of Radio Transmitter BC-655-A 53 85
Moistureproofing and fungiproofing Radio Set SCR-555-A 54 85
V. Supplementary data.
Maintenance parts list for Radio Set SCR-555-A 55 93
LIST OF ILLUSTRATIONS
Fig. No. Title. Page.
1 Radio Set SCR-555-A, complete assembly, in operation ix
2 Radio Set SCR-555-A, close-up view, in operation x
3 Radio Set SCR-355-A, crated 4
4 Radio Set SCR-555-A, miscellaneous components 3
5 Chest CH-128-A, components 7
6 Radio Transmitter BC-655-A, with cover 11
7 Correct placement of antenna for coastal installation 14
8 Tower TR-25-A, outline dimensions 16
9 Floor section and sills 17
10 Sills assembled to floor, tower legs, and apex block 18
11 Assembly of two tower legs to floor and apex block 20
12 Assembly of third tower leg to floor and apex block 21
13 Assembly of roof to tower 22
14 Antenna AN-105-A, outline dimensions 23
15 Assembly of antenna mast to crossarm 24
16 Assembly of both mast sections and of antenna rods 25
17 Method of using strap wrench 26
18 Mounting FT-365-A, outline dimensional drawing 27
19 Method of making telephone connection between mounting and floor 27
20 Assembly of Mounting FT-365-A to floor 28
21 Cabinet CS-155-A, outline dimensional detail 29
22 Cabinet CS-155-A, mounted 30
23 Writing shelf assembly 31
24 Assembly of azimuth scale 32
25 Ground connection 34
26 Chest CH-137-A, packed 36
27 Chest CH-105-A, packed 37
28 Chest CH-202-A, packed 38
29 Mounting of telescope 39
30 Compass calibration 42
31 Orientation example 42
32 Radio Transmitter BC-655-A placed for operation 44
33 Adcock and vertical antenna diagrams 50
34 Adcock and vertical antenna field patterns 51
35 Cardioid field patterns 52
36 Simplified form, switched-cardioid radio direction finder 53
37 Cardioid field patterns obtained by switching 54
38 Electronic switching, circuit diagram 55
39 Antenna AN-105-A, circuit diagram 77
40 Antenna AN-105-A, crossarm details 78
41 Figure-8 and vertical field patterns measured at 33 megacycles 111
42 Cardioid field patterns measured at 33 megacycles 112
43 Radio Receiver BC-1005-A, selectivity curve, 4.2 megacycles 113
44 Radio Receiver BC-1005-A, sensitivity curves 114
45 Typical radio direction finder performance data 115
46 Blank chart for recording radio direction finder performance data 116
47 Radio Receiver BC-1005-A, top view, tube socket layout and voltages 117
48 Radio Receiver BC-1005-A, bottom view, tube socket layout and voltages 118
49 Radio Receiver BC-1005-A, front view 119
50 Radio Receiver BC-1005-A, top view, coil shields in place 120
51 Radio Receiver BC-1005-A, top view, coil shields removed 121
52 Radio Receiver BC-1005-A, bottom view 123
53 Power Unit PE-155-A, top view 125
54 Power Unit PE-155-A, bottom view 126
55 Battery cable and power cable, wiring diagram 127
56 Power Unit PE-155-A, connection diagram 128
57 Power Unit PE-155-A, schematic diagram 129
58 Radio Receiver BC-1005-A, connection diagram, top view 131
59 Radio Receiver BC-1005-A, connection diagram, bottom view 133
60 Radio Transmitter BC-655-A, front view 135
61 Radio Transmitter BC-655-A, top view of chassis 136
62 Radio Transmitter BC-655-A, bottom view of chassis 137
63 Radio Transmitter BC-655-A, side view of chassis 138
64 Radio Transmitter BC-655-A, battery compartment 138
65 Radio Transmitter BC-655-A, schematic diagram 139
66 Block diagram of Radio Receiver BC-1005-A 141
67 Antenna system, schematic diagram 141
68 Adcock r-f amplifiers, schematic diagram 141
69 Vertical amplifiers, schematic diagram 141
70 Square-wave oscillator, schematic diagram 143
71 Negative pulse rectifiers, schematic diagram 143
72 Synchronous voltmeter, schematic diagram 143
73 R-f oscillator and mixer, schematic diagram 143
74 I-f amplifier, schematic diagram 145
75 C-w oscillator, schematic diagram 145
76 Second detector, automatic volume control, and bearing amplifier, schematic diagram 145
77 Output stage, schematic diagram 145
78 Radio Receiver BC-1005-A, schematic diagram 145
"United States of America, War Office."
"September 1944."
"Restricted."
Includes fold-out pages containing schematic diagrams
"Radio Set SCR-555-A is a self-contained, semiportable, ground, radio direction finder (RDF) station."--Page 1
"United States of America, War Office."
"September 1944."
"Restricted."
Includes fold-out pages containing schematic diagrams
"Radio Set SCR-555-A is a self-contained, semiportable, ground, radio direction finder (RDF) station."--Page 1
- Addeddate
- 2016-08-09 07:43:22
- Foldoutcount
- 0
- Identifier
- TM11-251
- Identifier-ark
- ark:/13960/t7xm34d8b
- Ocr
- ABBYY FineReader 11.0
- Openlibrary
- OL25938000M
- Openlibrary_edition
- OL25938000M
- Openlibrary_work
- OL17360123W
- Pages
- 161
- Ppi
- 600
- Scanner
- Internet Archive HTML5 Uploader 1.6.3
- Worldcat (source edition)
- 50492868
- Year
- 1944
- Full catalog record
- MARCXML
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