Table of contents
iv HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual
Front panel back light................................................................................4-29
PA and filters......................................................................................................4-30
PTT and PA filter control..........................................................................4-30
Gain control stage......................................................................................4-30
Pre-driver stages........................................................................................4-30
Driver stage ...............................................................................................4-31
Output stage and bias regulator.................................................................4-31
Output filters .............................................................................................4-31
ALC control...............................................................................................4-32
Selective calling..................................................................................................4-34
Calibration.................................................................................................4-34
Selective calling ........................................................................................4-35
Emergency call (RFDS) and two-tone calling...........................................4-36
Emergency alarm (marine)........................................................................4-37
PA Exciter Interface............................................................................................4-38
Filter and PTT control...............................................................................4-38
Power On/Off............................................................................................4-38
Transmit Amplifier....................................................................................4-39
Receiver Path.............................................................................................4-39
Antenna Control........................................................................................4-39
PA assembly 4404.....................................................................................4-40
Options................................................................................................................4-41
Option AM ................................................................................................4-41
Option CW ................................................................................................4-41
Option F.....................................................................................................4-41
Option GP..................................................................................................4-42
Option M...................................................................................................4-42
Option PH..................................................................................................4-42
Option STE (9390 only)............................................................................4-43
Accessories .........................................................................................................4-44
RS232/I
2
C Interface ..................................................................................4-44
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