FREDERICK ELECTRONICS lSOOB1500B, Instruction Manual

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SECTION
III
IV
CONTENTS (cont.)
OPERATION (cont.)
3.2.7 Crystal Frequency
3.2. 8
3. 2. 9
Osc Trim Control
AGC Switch
3.2.10 Output Level Control
3.2.11 Monitor Level
3.3
Operating The Receiver (FSK Reception)
3.4 Operating The Receiver (AM Reception)
THEORY OF OPERATION
4.1
Functional Description
4.2 Circuit Description
4.2.1 Preselector
4.2.2
Mixer Stage
4.2.3
4. 2. 4
4.2.5
4. 2.6
4. 2. 7
4. 2. 8
4. 2. 9
4. 2. 10
4.2.11
Local Oscillator
IF Amplifiers
Product Detector
AM Detector And AGC Amplifier
AM-FSK Selector Circuit
Audio Bandwidth Selector Circuit
Audio Amplifiers
AGC Circuits
4.2.10.1 FSK Operation
4.2.10.2 AM Operation
Po....,·er Supply
PAGE
3-4
3-5
3-8
3-8
3-99
3-9
3-10
4-1
4-4
4-4
4-5
4-6
4-7
4-7
4-8
4-8
4-8
4-9
4-9
4-9
4-11
4-11