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A6 AUDIO'S
YNTI
AUDIO
SYNTH
'
SYNTH 42
REF
——
1
(1 KHz)
MIC-2.
IDC [—
——
"
EXT
'4
1
MOD
^
';
/
\
1
—————————————'
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.
' • "•
|
^ESIZER
|"
PRGM
ATTEN
SEL
126
DPL
GEN
1
146
1 KHz
BPFL
^
1 24
-^
•66
l68
^
164
'>^62
bV ^
,
r————l
SEL
156, „.
1
" ""
SW
—————-^- DUPLEX MOD
————p^- DSBSC MOD
4S
- AUDIO SPKR
I S
. l^.^-MnnniiT
DRIVER
J
Figure 5-8.
Code Synthesizer Block Diagram
.
A8 IEEE ^TE?
. 4 0
SEL
CODE
^
.I;
SW
LVL
<>
—
28
SEL
M
SW
1KHz < ^
34
SEL
no <:,35|
SW
LVL
<^
^
" 3 6
301
421
6
I
SEL
SW
<• 3
S "F
1
LVL
-=•
5-16
CONTROL
A9
ROCESSOR
1
^ w •
FAC
PRGM
ATTEN
PRGM
ATTEN
-
IEEE
"BUS
PRGM
ATTEN
4
AM
PRGM
MOD+
ATTEN
DC REF
- Quick Links:
- Functions
- Spectrum Analyzer
- Power Supply
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