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3.2.6
3.2.7
3.2.8
3.2.9
3.2.10
3.2.11
3.3
3.3.1
3.3.1.1
3.3.1.2
3.3.1.3
3.3.2
3.3.3
3.3.3.1
3.3.3.2
4.1
4.2
4.2.1
4.2.1.1
4.2.1.2
4.2.1.3
4.2.2
4.2.2.1
4.2.2.2
4.2.2.3
4.2.3
4.2.4
4.2.5
4.2.6
4.3
4.3.1
4.3.2
4.3.2.1
4.3.2.2
4.3.2.3
4.3.3
4.3.3.1
4.3.3.2
4.3.3.3
4.3.4
4.3.4.1
4.3.4.2
4.3.4.3
4.3.5
4.3.5.1
4.3.5.2
4.3.5.3
4.3.6
'\
I
TABLE OF CONTENTS (Cont.)
I-LSB LINE LEVEL Screwdriver-Set Potentiometer
Lefthand Keypad Pushbutton Switches
Righthand Keypad Pushbutton Switches
Left (Mode/Meter) Liquid Crystal Display (LCD)
Right (Frequency Data) Liquid Crystal.Display (LCD)
. F AUL T 'Indicator (LED)
. Operating Instructions
RA6790/GM . Receiver Options Installation Check
- IF Bandwidth Filter Installation Check
Remote Interface Option Check (Serial Asynchronous Interface)
ISB Option Check
RA6790/GM Receiver/System Interface Check
. LOCAL/REMOTE Control Selection
LOCAL Control Operation Checklist
REMOTE Control Operation (Serial Asynchronous Inte~face)
SECTION IV. CIRCUIT DESCRIPTION
Introduction
.
. .. ..... . .
Functional Theory of Operation
Primary Signal RF /IF / AF Section
RF Signal
IF Signal
AF Signal.. ....
. ........ .
Oscilla tor Synthesizer: Section
First Local Oscillator Synthesizer
Second Local Oscillator Synthesizer
BFO Synthesizer
Automat::
~ain
Control (AGC) Section
Receiver ::ontro1 Section
Power Supply Section
BITE Functional Description
Detailed C:-cuit Description
RF Low P=...ss Filter, A 1
First Mixer, A2
RF Signal Lowpass Filter and Mixer
First Local Oscillator Input Filter and Drive Amplifier
AGe Controlled IF Amplifier
Second Mixer, AJ
First IF Amplifier
First Local OscUla tor Input Filter and Drive Amplifier
AGC Amplifier
Main IF / AF, A
4
IF Circuits
AF Circuits
AGC Control Circuits
Independent Sideband (ISB), A5
IF Circuits
AF Circuits
AGe Circuits
First Local Oscillator Synthesizer, A7
ii
3-3
3-3
3-4
3-4
3-6
·3-6 ...
.3-6.
3-7 .
3-7
3-8
3-9
3-9
3-11
3-11
3-18
4-1
4-1
4-1
4-1
4-3
4-4
4-4
4-4
4-5
4-5
4-6
4-6
4-10
4-10
4-12
4-12
4-13
4-13
4-13
4-13
4-13
4-15
4-15
4-15
4-17
4-17
4-19
4-21
4-23
4-23
4-23
4-23
4-25
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