TABLE OF CONTENTS
First Mixer ........................................................................ 5
Roofing Filters . ................................................................. 5
Roofing Filters .........................................................................6
AGC Circuits .................................................................... 7
Noise Level . .............................................................................9
AGC Off . ..................................................................................9
Noise Blankers . .............................................................. 10
REMOTE Connector .............................................................14
ALC .......................................................................................17
DRV Terminal ................................................................. 20
Protections . .................................................................... 21
SWR Protection . ....................................................................21
Local Oscillator .............................................................. 22
Signaling Paths .............................................................. 24
IF-AGC ..................................................................................30
IF Filter ..................................................................................32
Reception ...................................................................... 36
Demodulation ........................................................................36
AF Filter . ................................................................................37
Audio Peak Filter ...................................................................38
Noise Reduction . ...................................................................39
Beat Canceler . .......................................................................42
Transmission . ................................................................. 44
Modulation ............................................................................44
Other Functions ............................................................. 48
TX/RX Equalizers ..................................................................48
Voice Guidance .....................................................................48
Reference Level . ....................................................................50
Marker ...................................................................................51
Meter .....................................................................................52
Filter Scope ...........................................................................53
Keypad . .................................................................................54
Receiver . ...............................................................................55