Codan 9780 - Page 5

Table of contents
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual iii
Modulator..................................................................................................4-12
455 kHz filter and first mixer ................................................................... 4-12
45 MHz band-pass filter ........................................................................... 4-13
Second mixer and exciter output filter...................................................... 4-13
Tune..........................................................................................................4-13
Local oscillators ................................................................................................. 4-15
General...................................................................................................... 4-15
VCO1 and phase lock loop (04–02972) ...................................................4-15
VCO1 and phase lock loop (04-03135)....................................................4-16
VCO2 and phase lock loop (04-02972)....................................................4-17
VCO2 and phase lock loop (04-03135)....................................................4-18
455 kHz local oscillator for USB/LSB (04-02972) .................................. 4-18
455 kHz local oscillator for USB/LSB (04-03135) .................................. 4-19
Clarifier.....................................................................................................4-20
Microprocessor and peripherals—transceiver....................................................4-21
Microprocessor ......................................................................................... 4-21
I
2
C buses ................................................................................................... 4-22
Synthesiser bus..........................................................................................4-23
PA serial bus............................................................................................. 4-23
RS232 bus................................................................................................. 4-23
Tone generation ........................................................................................ 4-23
A/D inputs.................................................................................................4-24
Antenna control......................................................................................... 4-24
E
2
PROM write protect.............................................................................. 4-25
Microprocessor and peripherals—control panel ................................................ 4-26
Microprocessor ......................................................................................... 4-26
I
2
C buses ................................................................................................... 4-26
Keypad......................................................................................................4-26
Select control ............................................................................................ 4-27
Volume control ......................................................................................... 4-27
Display...................................................................................................... 4-27
Microphone keypad ..................................................................................4-28
Data input/output ......................................................................................4-28
"S"+ RF indicator...................................................................................... 4-29
Mute indicators ......................................................................................... 4-29