General Description; Paragraph Page - Watkins-Johnson Company WJ-8718-19/FE Instruction Manual

WJ-8718-19/FE HF RECEIVER CONTENTS
TABLE OF CONTENTS (Cont'd)
SECTION III
CIRCUIT DESCRIPTION
Paragraph Page
3.1 Introduction 3_1
3.2 General Description 3_1
3.2.1 Input RF Switching Section []]] 3_1
3.2.2 Frequency Extender Section 3_3
3.2.3 RF/IF Conversion Section ..*.. 3.4
3.2.4 IF/Demodulator Section ][ 3.5
3.2.5 Synthesizer Section 3_6
3.2.6 Digital Control Section 3-7
3.2.7 Power Supply Section 3_8
3.3 Functional Theory of Operation 3-9
3.3.1 Input RF Switching Section 3-9
3.3.1.1 Input Switch, FE-A2 3-9
3.3.1.2 RF Filter, A2 ."."." 3-9
3.3.2 Frequency Extender, FE-A1 3-11
3.3.2.1 VHF Preselector/lst LO, FE-A1A1 3-12
3.3.2.2 Input Converter/2nd LO, FE-A1A2 3-12
3.3.3 RF/IF Conversion . " 3-12
3.3.3.1 Input Converter (A3) 3-13
3.3.3.1.1 1st Mixer, A3A1 3-13
3.3.3.1.2 2nd Mixer, A3A2 3-13
3.3.4 IF/Demodulator Section 3-13
3.3.4.1 10.7 MHz Filter Switch (A4A1) 3-13
3.3.4.2 10.7 MHz/455 kHz Converter (A4A2) 3-15
3.3.4.3 455 kHz Filter Switch (A4A3) 3-16
3.3.4.4 AGC Amplifier (A4A6) 3-16
3.3.4.5 455 KHz Ampl/AM Detector (A4A7) 3-16
3.3.4.6 FM/CW/SSB Detector (A4A9) 3-16
3.3.4.7 Audio Amplifier (A4A10) 3-17
3.3.5 Synthesizer Section 3-17
3.3.5.1 1st LO Synthesizer (A5A1) 3-18
3.3.5.2 2nd LO Synthesizer (A5A2) 3-18
3.3.5.3 3rd LO Synthesizer (A5A1) 3-18
3.3.5.4 BFO Synthesizer (A5A3) 3-18
3.3.5.5 Time Base (P/O A5A1) 3-18
3.3.6 Digital Control Section 3-19
3.3.6.1 Synthesizer Interface/Memory(A6Al) 3-19
3.3.6.2 IF Interface(A6A2) 3-19
3.3.6.3 Asynchronous I/O (A6A3) 3-19
3.3.6.4 Serial I/O Buffer (A6A4) 3-19
3.3.6.5 Sync Serial I/O (A6A5) 3-21
3.3.6.6 Front Panel Switch/Encoder (MFP-Al) 3-21
3.3.6.6.1 Front Panel Switchboard (MFP-AlAl) 3-21
3.3.6.6.2 Front Panel Encoder (MFP-A1A2) 3-21