Table of Contents
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C0NTENTS
WJ-8718-19/FE HF RECEIVER
Paragraph
TABLE OF CONTENTS (Cont'd)
SECTION III
CIRCUIT DESCRIPTION
Page
3.3.7
Power Supply Section
3 „.
3.4
Circuit Descriptions
*
, 21
3.4.1
RF Input Filter (A2)
••••-.
-
3.4.2
1st LO Synthesizer (FE-A1 AlAl)
" "
3-23
3.4.3
VCO (FE-A1A1A2)
!!!!!!!!
3-25
3.4.4
Preselector (FE-A1A1A3)
•
3-26
3.4.5
2nd LO Synthesizer (FE-A1A2A1)
....WWW
3-27
3.4.6
2nd Converter (FE-A1A2A2)
3-28
3.4.7
1st Converter (FE-A1A2A3)
•-••••
3.4.8
RF Input Switch (FE-A2)
3-30
3.4.8.1
RF Input Switch (FE-A2A1)
3_30
3.4.9
1 MHz Filter (FE-A3)
3.4.10
Input Converter (A3)
WWW!!
3-30
3.4.10.1
First Mixer (A3A1)
V...........]...].........
3-30
r
3.4.10.2
Second Mixer (A3A2)
3-32
3.4.11
10.7 MHz Filter Switch (A4A1)
.'
3-32
3.4.12
10.7 MHz/455 kHz Converter (A4A2)
3-34
3.4.13
455 MHz Filter Switch (A4A3)
W.i
3-36
3.4.14
AGC Amplifier (A4A6)
3-36
3.4.15
455 kHz Amplifier/AM Detector (A4A7)
3-40
3.4.16
FM/CW/SSB Detector (A4A9)
3-40
3.4.17
Audio Amplifier (A4A10)
3-43
3.4.18
1st and 3rd LO Synthesizer/Time Base (A5A1)
3-46
3.4.18.1
VCO (A5A1A1)
3_46
3.4.18.2
1st and 3rd LO/Time Base (A5A1A2)
."..'.WW'!!!!!
3-46
3.4.19
2nd LO Synthesizer (A5A2)
,
3-52
3.4.20
BFO Synthesizer (A5A3)
3-55
3.4.21
Synthesizer Interface/Memory(A6Al)
3-57
3.4.22
IF Interface (A6A2)
3-6O
3.4.23
Asynchronous I/O (A6A3)
3-62
3.4.24
Serial I/O Buffer (A6A4)
!!!!
3-65
3.4.25
Sync Serial Input/Output (A6A5)
!!!!!!!!!
3-67
3.4.26
Front Panel Switch Encoder (MFP-Al)
3-69
3.4.26.1
Front Panel Encoder Board (MFP-Al Al)
W.
3-69
3.4.26.2
Front Panel Switch Board (MFP-AlA2)
WW!!
3-71
VI
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