DRAKE R8 Manuals

DRAKE R8 Manuals

Manuals and User Guides for DRAKE R8. We have 1 DRAKE R8 manual available for free PDF download: Service Manual

DRAKE R8 Service Manual

DRAKE R8 Service Manual (95 pages)

communications receiver

Brand: DRAKE | Category: Telephone | Size: 7 MB

Table of Contents

Addendum
2
Safety Instructions
3
Safety Precaution
3
Product Safety Notice
3
Table of Contents
4
Using the R8/R8E Service Manual
6
Locating a Malfunction
6
Generalized Theory of Operation
7
Receiver Section
7
Frequency Control
8
Interconnect Drawing Parts List
9
Mescellaneous Chassis Parts
9
Receiver Block Diagram
11
Interconnect Diagram
12
Circuit Description
13
Front End Board Theory of Operation
13
Front End Board Parts List
15
Front End Board Schematic
19
Theory of Operation
25
Noise Blanker
25
Step Variable BPF
25
IF AMP and AGC Generator
25
Audio Processing
26
-5 VDC Generator
26
Second if Board Parts List
27
2Nd If/Audio/Power Supply Board Schematic
33
2Nd If/Audio/Power Supply Board Pictorial
36
Synthesizer/Microprocessor Theory of Operation
39
Reference Oscillator
39
1St lo
39
Inner Loop PLL3
39
Middle Loop PLL2
40
Outer Loop PLL1
41
2Nd LO/PBT
42
Bfo/Digital Mixer
42
VHF Reference
42
Synthesizer and Microprocessor Board Parts List
43
Synthesizer Block Diagram
51
Synthesizer Circuits Schematic
53
Synthesizer/Microprocessor Board Pictorial
55
Digital Section - Theory of Operation
57
Microprocessor and Memory
57
Radio Controls
57
Microprocessor Block Diagram
59
Microprocessor Circuits Schematic
60
Front & Rear I/O Theory of Operation
61
Front Panel Board Parts List
63
Keyboard Switch Matrix Diagram
64
Keypad Schematic - PC Art
64
8 Keypad Schematic PC Art
64
Front Panel Board Schematic
65
Front Panel Board Pictorial
66
Alignment
69
Power Supply Voltage Checks and Setting Clock/Timer
69
Synthesizer and PBT Alignment and Test
69
35 Mhz Reference Oscillator
69
Loop 2 Adjustments
70
Loop 1 Adjustments
70
50 Khz BFO Checks
70
Front End Board Alignment and Test
71
Check of Front End Bandpass Filters
71
Antenna Switching Checks
71
45 Mhz if Section Alignment and Tests
71
Image Reject Mixer Section Alignment and Tests
72
FM Squelch Adjustment
72
F.M. Detector Alignment and Checks
72
Second I.f./Audio Board Tune up and Test
73
50 Khz if Filter Tune up
73
A.G.C. and S-Meter Setup
73
SSB-AM Squelch Setup
73
Recovered Audio Output Tests
74
Notch Null Adjustments
74
Synchronous Detector Setup
74
Noise Blanker Check and Adjustment
75
VHF Converter Accessory
77
VHF Block Converter Theory of Operation
79
RF Section
79
Control
79
Synthesize
79
VHF Converter Board Schematic
85
VHF Converter Board Pictorial
86
VHF Converter Alignment
87
VCO Test and Tune
87
Preselector Tuning and Checks
87
Low Band
87
Sensitivity and Microphonics Test
88
High Band
88
High Band Filter Response
88
Sensitivity Test
88

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