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DRAKE Manuals
Telephone
R8
Service manual
DRAKE R8 Service Manual
Communications receiver
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Table Of Contents
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Contents
Table of Contents
Bookmarks
Table of Contents
Addendum
Safety Instructions
Safety Precaution
Product Safety Notice
Table of Contents
Using the R8/R8E Service Manual
Locating a Malfunction
Generalized Theory of Operation
Receiver Section
Frequency Control
Interconnect Drawing Parts List
Mescellaneous Chassis Parts
Receiver Block Diagram
Interconnect Diagram
Circuit Description
Front End Board Theory of Operation
Front End Board Parts List
Front End Board Schematic
Theory of Operation
Noise Blanker
Step Variable BPF
IF AMP and AGC Generator
Audio Processing
-5 VDC Generator
Second if Board Parts List
2Nd If/Audio/Power Supply Board Schematic
2Nd If/Audio/Power Supply Board Pictorial
Synthesizer/Microprocessor Theory of Operation
Reference Oscillator
1St lo
Inner Loop PLL3
Middle Loop PLL2
Outer Loop PLL1
2Nd LO/PBT
Bfo/Digital Mixer
VHF Reference
Synthesizer and Microprocessor Board Parts List
Synthesizer Block Diagram
Synthesizer Circuits Schematic
Synthesizer/Microprocessor Board Pictorial
Digital Section - Theory of Operation
Microprocessor and Memory
Radio Controls
Microprocessor Block Diagram
Microprocessor Circuits Schematic
Front & Rear I/O Theory of Operation
Front Panel Board Parts List
Keyboard Switch Matrix Diagram
Keypad Schematic - PC Art
8 Keypad Schematic PC Art
Front Panel Board Schematic
Front Panel Board Pictorial
Alignment
Power Supply Voltage Checks and Setting Clock/Timer
Synthesizer and PBT Alignment and Test
35 Mhz Reference Oscillator
Loop 2 Adjustments
Loop 1 Adjustments
50 Khz BFO Checks
Front End Board Alignment and Test
Check of Front End Bandpass Filters
Antenna Switching Checks
45 Mhz if Section Alignment and Tests
Image Reject Mixer Section Alignment and Tests
FM Squelch Adjustment
F.M. Detector Alignment and Checks
Second I.f./Audio Board Tune up and Test
50 Khz if Filter Tune up
A.G.C. and S-Meter Setup
SSB-AM Squelch Setup
Recovered Audio Output Tests
Notch Null Adjustments
Synchronous Detector Setup
Noise Blanker Check and Adjustment
VHF Converter Accessory
VHF Block Converter Theory of Operation
RF Section
Control
Synthesize
VHF Converter Board Schematic
VHF Converter Board Pictorial
VHF Converter Alignment
VCO Test and Tune
Preselector Tuning and Checks
Low Band
Sensitivity and Microphonics Test
High Band
High Band Filter Response
Sensitivity Test
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