Code Synthesizer Block Diagram - Motorola R-2002A Manual

Communications system analyzer
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SYNTH
42
REF
(.1KHz)
MIC
12
EXT
14
MOD
SEL
sw
..._
______ _
SEL
sw
I
I
so
148
144
. .
26
CODE
SYNTH
LVL
46
1KHz
LVL
24
EXT
LVL
66
68
64
DSBSC MOO
MOO CAL AUDIO
AUDIO SPKR
MOO OUT
-
- -
36
30
42
-
Figure
5-B.
Code Synthesizer Block Diagram
852141
5-63.
The three modulation sources are sumed together on the Audio Synthesizer module after the level
controls. The composite modulation signal is then switched to the appropriate modulator and applied to the
modulation determination circuitry (MOD CAL AUDIO), the audio amplifier (SPKR AUDIO), and the
Modulation Output jack (MOD OUT) on the front panel. The signal to the front panel jack is buffered by a Driver
Amplifier to provide a low driving source impedance.
5-64.
The AM modulation signal at the output of the Select Switch is sumed with a +5 volt signal. This
combination provides a DC level to control the average output power of the wideband amp in the RF Input
module, and a superimposed modulation signal to give an AM output. The RF Level control on the front panel
for local control or the Programmable Attenuator on the IEEE module provide local or remote RF level control
by simultaneously attenuating the DC level and the modulating signal. The resulting signal is the AM MOD &
DC REFERENCE signal to the RF Input module.
5-16

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