
Chapter 10 315
Block Diagrams
Reference/Regulator Section
Figure 10-21 Reference Assembly, A2A23
REFERENCE ASSEMBLY, A2A23
S
Y
N
T
H
+10/
+50
500 kHz
HPF
10 MHz
REF IN
10MHz
OUT-OF-LOCK
OVERRIDE
EXT REF
X2 FREQ
DOUBLER
10-20MHz
1000 MHz ON/OFF
OUT-OF-LOCK
+50
OSC
FREQ
LOCK
2 DACS
ADJUST
FREQ
10MHz TCXO
OR
OPTIONAL OCXO
1GHz
VCO
1GHz
+2
1000 MHz
ON/OFF
1000MHz
LO
I.O.
SG
REF
SYN RCVR
REF
20MHz TO
COUNTER
TO SA
10MHz
TO SIDE
PANEL
GND
20MHz
A
A
A
MOTHERBOARDP/O
A2A1
10MHz
OUT
(GENREF)
7dBm
MIN
SINE
+5dBm
UPCONVERTER
REF
TO SA
CMOS
CMOS
1MHz
1MHz
TO
RCVR
SYNTH
RCVR
TO
SYNTH
+12.4
+5.1
-12.4
CK
D
EN/I
DIAG
DIAG
500MHz
LO
(2 DACS
ADJUST)
.20M +10M REFS OUT:
ARE < -90dBc SPURS
> 5K OFF
10M (RCVR) < -110 dBc > 5 kHz
10MHz
REF IN
(GENREF)
10MHz
SINE
-10dBm
TO RCVR
SSB BFO
TO
OCXO
+12V
AUX
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