Equipment information

Collins Telecommunications 51J-4 Receiver
Manufacturer:
Model:
51J-4
Date:
1961
Category:
Group:
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.

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Service and User Manual
Manual Type:
Service and User Manual
Pages:
79
Size:
12.08 Mbytes (12668028 Bytes)
Language:
english
Revision:
9th Edition
Manual-ID:
520-5014-00
Date:
15 September 1961
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
04 August 2017
MD5:
e8af927034b7f114aea3c1c3836441df
Downloads:
485

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

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