Equipment information

Collins Telecommunications 51J-4 Receiver
Manufacturer
Collins Telecommunications
Model 51J-4
Date 1961
Category: Radio, Communication
Group Receiver
Description Communications Receiver
Information
                                    Collins 51J-4 Receiver is designed for communication
applications where stability and dial accuracy of the
highest order are the prime requisites. Under normal
operating conditions, the receiver operates in the
,y
range of 540 kc to 30. 5 me with a total setting error and
drift of less than 1 kc at any frequency within its range.
The receiver is designed for amplitude- modulated and
continuous wave reception, although its accuracy and
stability make it suitable for many applications where it is
desired to receive or set definite frequencies without
searching or making frequent adjustments. This receiver
incorporates the new mechanical filter in the intermediate
frequency range to obtain the desirable rectangularshaped
passband.
1.1.3. DESCRIPTION.
(a) MECHANICAL. - The 51J-4 Receiver is available in two
styles. One is a panel and shelf assembly suitable for
mounting in a standard rack cabinet. Over-all panel
dimensions are: width,
19 inches; height, 10-1/2 inches; and depth behind panel,
13-1/2 inches. A dust cover that fits over the top of the
chassis is removable from the rear.
The other assembly is in a cabinet suitable for
table-mounting. Outside cabinet dimensions are: width,
21-1/8 inches; height, 12-3/8 inches and depth, 13-1/8
inches. Available on special order is a speaker that matches
this cabinet. The speaker's dimensions are: width, 13
inches; height, 11 inches; depth, 7 inches. The speaker, the
cabinet of the table-mounting assembly, and the front panel
of the rack-mounting receiver are finished in St. James Gray
wrinkle.

These manuals are available for the above equipment:

Manual Type Service and User Manual Collins-9142-Manual-Page-1-Picture
Pages 79
Size 12.08 Mbytes (12668028 Bytes)
Language english
Revision 9th Edition
Manual-ID/Number 520-5014-00
Date 15 September 1961
Quality Scanned document, reading partly badly, partly not readable.
Upload date
MD5 e8af927034b7f114aea3c1c3836441df
Downloads 33 since 04 August 2017
Information
SECTION 1 - GENERAL DESCRIPTION
1.1.
GENERAL............................................................................................................................................................1-1
1.1.1. Purpose of
Book...........................................................................................................................1-1
1.1.2 . Purpose of
Equipment...............................................................................................................1-1
1.1.3.
Description..................................................................................................................................1-1
1.1.4 . Equipment
Supplied.....................................................................................................................1-2
1.1.5. Accessories Available
..........................................................................................................1-2
1.2. VACUUM TUBE
TABLE................................................................................................................................1-3
1.3. REFERENCE
DATA...........................................................................................................................................1-3
SECTION 2 - INSTALLATION
2.1.
UNPACKING......................................................................................................................................................2-0
2.1.1.
Procedure....................................................................................................................................2-0
2.2.
INSTALLATION.................................................................................................................................................2-0
2.2.1.
General...........................................................................................................................................2-0
2.2.2. Antenna
Connection.....................................................................................................................2-0
2.2.3. Audio Output
Connections.........................................................................................................2-0
2.2.4. I-F Output
Connection...............................................................................................................2-0
2.2.5 . Remote Standby
Connections...................................................................................................2-0
2.2.6. Power
Connection.....................................................................................................................2-0
2.2.7.
Tubes...................................................................................................................................................2-0
2.2.8.
Fuse.................................................................................................................................................2-2
SECTION 3 - ADJUSTMENT AND OPERATION
3.1.
ADJUSTMENT.................................................................................................................................................3-1
3.1.1.
General...........................................................................................................................................3-1
i
3.2.
OPERATION.......................................................................................................................................................3-1
3.2.1 . Function of
Controls...............................................................................................................3-1
3.2.2. Tuning AM Signals
.....................................................................................................................3-3
3.2.3. Tuning Single-Sideband Signals
..............................................................................................3-4
3.2.4. Tuning CW
Signals.....................................................................................................................3-4
3.2.5. Frequency
Measuring...............................................................................................................3-5
3.3. NOTES ON MECHANICAL
FILTERS...................................................................................................3-5
3.3.1. General
.....................................................................................................................................3-5
SECTION 4 - CIRCUIT DESCRIPTION
4.1. MECHANICAL
DESCRIPTION..........................................................................................................................4-0
4.1.1. Band
Change...............................................................................................................................4-0
4.1.2.
Tuning..........................................................................................................................................4-0
4.1.3 . Frequency
Indication...............................................................................................................4-3
4.2. ELECTRICAL
DESCRIPTION.......................................................................................................4-3
4.2.1. General
.................................................................................................................................................4-3
4. 2. 2. Radio Frequency
Amplification......................................................................................................4-3
4. 2. 3. Mixer
Stages........................................................................................................................................4-5
4. 2.4. High Frequency
Oscillator...............................................................................................................4-5
4.2.5. Variable Intermediate
Frequency.................................................................................................4-7
4. 2.6. Variable Frequency
Oscillator......................................................................................................4-7
4. 2. 7. Crystal Filter
....................................................................................................................................4-7
4.2.8. Second Intermediate
Frequency.........................................................“............................................4-9
4.2.9.
Detector..............................................................................................................................................4-9
4. 2.10. Noise
Limiter....................................................................................................................................4-9
4. 2.11. Automatic Volume
Control...............................................................................................................4-11
4. 2.12. Audio
Amplifier................................................................................................................................4-11
4. 2.13. 50 Ohm I-F Output
*........................................................................................................................4-11
4.2.14. 100 KC Calibrator
..........................................................................................................................4-11
4.2.15. Power Supply. .
.............................................................................................................................4-12
4.2.16. Beat Frequency
Oscillator..............................................................................................................4-12
4.2.17. Mechanical
Filter...........................................................................................................................4-12
SECTION 5 - MAINTENANCE
5.1.
INSPECTION........................................................................................................................................................5-1
5.1.1.
General.................................................................................................................................................5-1
5.1.2. Routine
Inspection...........................................................................................................................5-1
5.1.3.
Cleaning.............................................................................................................................................5-1
5.1.4. Vacuum
Tubes..........................................................
.
...............................................................5-1
5.1.5. Tube Replacement Precautions. . .
......................................................................................5-1
5.1.6. Tube
Table........................................................................................................................................5-1
5.2. TROUBLE SHOOTING
........................................................................................................................................5-2
5.2.1.
General................................................................................................................................................5-2
5.2. 2.
Fuses....................................................................................................................................................5-2
«
5.3. ALIGNMENT.
........................................................................................................................................................5-2
5.3.1.
General................................................................................................................................................5-2
5.3. 2. Equipment and Tools Used for
Alignment...............................................................................5-2
5.3.3. Crystal Oscillator Trimmer
Adjustment....................................................................................5-2
5.3.4. 100 KC Oscillator
Alignment......................................................................................................5-3
5. 3. 5. Fixed 500 KC I-F Amplifier
Alignment....................................................................................5-3
5.3.6. Alternate BFO Alignment
Method................................................................................................5-5
5.3.7. 500 KC I-F Performance
Measurements....................................................................................5-5
5.3. 8. Alignment of Dials with
VFO......................................................................................................5-6
5. 3.9. Variable I-F Alignment and RF Alignment Band
2..............................................................5-9
5.3.10. Variable I-F Alignment and RF Alignment Band
3..............................................................5-9
*
5.3.11. RF Alignment Bands
4-7..............................................................................................................5-10
5. 3.12. RF Alignment Bands
8-15..............................................................................................................5-10
5. 3.13. RF Alignment Bands
16-30..............................................................................................................5-10
5.3.14. RF Alignment Band
1.......................................................................................................................5-10
5. 3.15. VFO
Alignment...................................................................................................................................5-10
5.3.16. Adjustment of
L-124.......................................................................................................................5-12
5.3.17. Intermediate Amplifier Gain Adjustment
................................................................................5-12
4
5.4. COMPLETE VFO REMOVAL AND
REPLACEMENT..............................................................................5-12
5.5. DIAL BULB AND STATIC DISCHARGE BULB
REPLACEMENT....................................................5-13
5.5.1. Dial Bulb
Replacement.....................................................................................................................5-13
5. 5. 2. Static Discharge
Bulb......................................................................................................................5-13
5.6. DIAL AND BAND CHANGE GEAR
MAINTENANCE..............................................................................5-13
5.6.1.
General...................................................................................................................................................5-13
5.6.2. Disassembly of Gear
Box..............................................................................................................5-13
5.6. 3. Reassembly of Gear
Box.................................................................................................................5-15
5.7. RF TUNER ASSEMBLY
MAINTENANCE....................................................................................................5-17
5.7.1.
General...................................................................................................................................................5-17
5.7. 2. Positions of
Cams.............................................................................................................................5-17
5. 8. DIAL
CORDS...........................................................................................................................................................5-18
5. 8.1. Megacycle Pointer
Cord.................................................................................................................5-18
5.8. 2. Drum
Cord...........................................................................................................................................5-19
SECTION 6 - PARTS LIST
SECTION 7 - PARTS IDENTIFICATION AND SCHEMATIC
Collins-9142-Manual-Page-1-Picture


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