4
2. CONTROL SETTINGS ...................... ..............................................………..28
a.
Power ......................................................................................... ………....28
b. Function Switch...........................................................................................28
c. Squelch.........................................................................................................28
d. Audio Gain....................................................................................................28
SECTION 4 - MAINTENANCE
1. INTRODUCTION ........................................................................... .................29.
2. IF ALIGNMENT PROCEDURE (
Sweep Method
)
a.
General Instructions........ .................. .......................................................30
b.
Equipment Required . . ............................................................... ………..30
c. Control Settings ............................... .......................................... ………..30
"Master" 200 Kc. IF Channel Alignment
.. .........................................................31
d.
Second Limiter, Adjustment of T-507........................................ ………..31
e.
Discriminator, Adjustment of T-508 .......................................... ………..31
f.
First Limiter, Adjustment of T-505 and T-506 ......................... ………..31
g.
Second IF Amplifier, Adjustment of T-503 and T-504 ............. ………..31
h.
First IF Amplifier, Adjustment of T-501 and T-502 .................. ………..31
"Slave" 200 Kc. IF Channel Alignment
..... .........................................................32
d.
Third IF amplifier, Adjustment of T-307 and T-308 .................. ………..32
e.
Third-Second IF amplifier, Adjustment of T-305 and T-306.... ………..32
f.
Second IF Amplifier, Adjustment of T-303 and T-304 ............. ………..32
g.
First IF Amplifier, Adjustment of T-301 and T-302 .................. ………..32
"Master" 40 Kc. IF Channel Alignment
.... .........................................................33
d.
40 Kc. Band-Pass Filter, Adjustment of L-606 and L-607.......................33.
e.
2.5 Mc. IF Amplifier................................................................... ………..33
"Slave" 40 Kc. IF Channel Alignment
....... .........................................................34.
d.
40 Kc. Band-Pass Filter, Adjustment of L-602 and L-603........ ………..34
e.
2.5 Mc. IF Amplifier................................................................... ………..34
3. LOCAL OSCILLATOR ADJUSTMENTS ........................................ ………..34
a.
Local Oscillator Adjustment, "Master" RF Tuner only.............. ………..34
b.
Mechanical Adjustments ............................................................ ………..34
4. RF AMPLIFIER ALIGNMENT………………………………………….…....35
a.
RF Amplifier Alignment............................................................. ………..35
5. IF ALIGNMENT (
CW Method
) ......................................................... ………..36
a.
Introduction................................................................................. ………..36
"Master" 200 Kc. IF Channel Alignment
.......................................... ... ………..36
b.
Second Limiter Alignment - (CW Method)................................ ………..36
Summary of Contents for G-187
Page 7: ...7 Figure 1 1 Model G 187 Special Purpose Receiver Front View...
Page 9: ...9 Table 1 2 Semiconductor and Tube Complement...
Page 10: ...10 Table 1 2 Semiconductor and Tube Complement continued...
Page 14: ...14 Fig 2 1 Block Diagram Model G 187 Receiver...
Page 44: ...44 Fig 4 1 Model G 187 Receiver Top View Cover Removed...
Page 45: ...45 Fig 4 2 Model G 187 Receiver Bottom View Covers Removed...
Page 46: ...46 Fig 4 3 Model G 187 Receiver Rear View...
Page 47: ...47 Fig 4 4 Model G 187 Receiver Panoramic Top View Cover Removed...
Page 48: ...48 Fig 4 5 Model G 187 Receiver Panoramic Top View Left Side Cover Removed...
Page 49: ...49 Fig 4 6 Model G 187 Receiver Panoramic Top View Right Side Cover Removed...
Page 50: ...50 Fig 4 7 Model G 187 Receiver Panoramic Bottom View Covers Removed...
Page 51: ...51 Fig 4 8 Model G 187 Receiver Panoramic Bottom View Left Side Covers Removed...
Page 52: ...52 Fig 4 9 Model G 187 Receiver Panoramic Bottom View Right Side Covers Removed...
Page 53: ...53 Table 4 2 Model G 187 Receiver Component Boards Lists...
Page 54: ...54 Fig 4 10 Model G 187 Receiver Large Component Board...
Page 56: ...56 Fig 4 14 Model G 187 Receiver Master Slave RF Tuners Top View...
Page 57: ...57 Fig 4 15 Model G 187 Receiver Master Slave Tuners Bottom View Covers Removed...
Page 58: ...58 Fig 4 16 Model G 187 Receiver Master Slave Tuners Panoramic Bottom View Covers Removed...
Page 59: ...59 Fig 4 17 Model G 187 Receiver Master RF Tuner Bottom View Cover Removed...
Page 60: ...60 Fig 4 18 Model G 187 Receiver Slave RF Tuner Bottom View Cover Removed...
Page 67: ...67 Fig 5 1 Model G 187 Receiver Schematic Diagram Master RF Tuner...
Page 68: ...68 Fig 5 2 Model G 187 Receiver Schematic Diagram Slave RF Tuner...
Page 71: ...71 Fig 5 5 Model G 187 Receiver Schematic Diagram Main Chassis Circuits...
Page 72: ...72 Fig 5 6 Model G 187 Receiver Schematic Diagram Mainframe...
Page 73: ...73 Fig 5 7 Model G 187 Receiver Schematic Diagram Power Supply Circuits...
Page 74: ...74 Fig 5 8 Model G 187 Receiver Schematic Diagram Various Details...