Aeroflex 2944B - Page 161

TECHNICAL DESCRIPTION
4-5
To Printer: Trim A3 printed sheets by 0.75" (19mm) from right edge to clear binder.
C3320
MODULATION
CONTROLLER
MODULATION FROM
SYSTEMS BOARD B3/1
AM
DEMODULATOR
FM
DEMODULATOR
AF
INPUT
AF
GENERATORS
AGC
FILTER
BANDWIDTH
FILTERS
20 Hz - 20 kHz
10 MHz
REF
10 MHz
REF
3RD LOCAL
OSCILLATOR
90 MHz REF
OSCILLATOR/
LOOK & LISTEN
ONLY PRESENT
WHEN SSB
OPTION FITTED
ONLY PRESENT
WHEN SYSTEMS
OPTION FITTED
3RD LOCAL
OSCILLATOR
90 MHz
+/- 0.5 MHz
10 MHz
REF
1280 MHz
1359.3 TO
2409.3 MHz
1ST
MIXER
1359.3 MHz 79.3 MHz 10.7 MHz (10.625 MHz SSB)
2ND
MIXER
3RD
MIXER
LOOK & LISTEN
MIXER
10 MHz
REF
FM MODULATION INPUT
400 kHz-1.05 GHz
1ST LOCAL
OSCILLATOR
2ND LOCAL
OSCILLATOR
EXTERNAL
MODULATION
INPUT
DUPLEX
OSCILLATOR
1280.1 TO
2330 MHz
SEE FIG.
DETAILED
BLOCK
DIAGRAM
SEE FIG.
DETAILED
BLOCK
DIAGRAM
AF
FILTERS
DISTORTION/
SINAD
FILTER
FROM
BROAD BAND
POWER METER
DEMOD OUTPUT
TO RMS A/D CONVERTER ON
MICROPROCESSOR BOARD
TO PEAK DETECTOR ON
MICROPROCESSOR BOARD
TO OSCILLOSCOPE INPUT
TO DEMOD/AF ON
SYSTEMS BOARD B3/1
LOG
10.7 MHz
SSB DEMOD
MULTIPLEXER
IF
INPUT
ATTENUATORS
PULSE
SHAPER
10 MHz
REFERENCE
SIGNAL
AF
OUTPUT
AM
MODULATOR
BROADBAND
POWER
METER
AGC
FILTER
20dB
0-100dB
0-60dB
20dB
50dB
A11/1
A2 A2 A3 A3 A3 A3 A3 A4/1
SSB DEMOD
OUTPUT
10 MHz
REF
A4/1 A4/1 A4/1 A4/1
TO A/D
DISPLAY
INPUT
TO SQUELCH
ON SYSTEMS
BOARD B3/1
SQUELCH
A9/1 A10
A6/1 A6/1
B1/2 A13/1-A14/1
RF OUTPUT LEVEL CONTROL
& AM MODULATION
A12 A10
A9/1
LOOK & LISTEN
SWEEP INPUT
B1/2
B1/2
B1/2
B1/2 B1/2
B1/2
B1/2
B1/2 B1/2 B1/2 B1/2 B1/2 B1/2 B1/2
B1/2
B1/2
A3 A9/1
A7-A8
INPUT/
OUTPUT
SWITCHING
A11/1
A9/1 A9/1
A15
B3/1
SYSTEMS
DEMOD/AF
AF OUT
MODULATION
OUTPUT TO
MODULATION
CONTROLLER B1/2
Fig. 4-2 Simplified block diagram