Comtech EF Data KST-12025 - Manual (Page 100)

Theory of Operation KST-12025 Ku-Band Satellite Terminal
5–14 Rev. 1
10 MHz REFERENCE
M&C BUS
LO REFERENCE
DOWNLINK SYNTH RF OUTPUT
SMA FEMALE
CMOS LEVELS
SQUARE WAVE
2300 MHz
SMA FEMALE
-7 dBm
+12 VDC
FREQUENCY CONTROL
VCO TUNING VOLTAGE MONITORS
LOCK DETECT SIGNALS
SMA FEMALE
+8 dBm
9730 to 11530 MHz
(10.95 to 12.75 GHz RCV)
9730 to 10480 MHz
(10.95 to 11.7 GHz RCV)
10480 to 10980 MHz
(11.7 to 12.2 GHz RCV)
11030 to 11530 MHz
(12.25 to 12.75 GHz RCV)
Figure 5-6. Down Converter Synthesizer Diagram
10 MHz REFERENCE
M&C BUS
LO REFERENCE
U/C RF LO
SMA FEMALE
CMOS LEVELS
SQUARE WAVE
2300 MHz
SMA FEMALE
-4 dBm
+12 VDC
FREQUENCY CONTROL
VCO TUNING VOLTAGE MONITOR
LOCK DETECT SIGNALS
12780 to 13280 MHz
SMA FEMALE
+8 dBm
Figure 5-7. Up Converter Synthesizer Diagram
5.5 Down Converter
The function of the down converter is to convert the Ku-band signal from the LNA to a
70 MHz IF signal for use in the modem.
Refer to Figure 5-8 for a functional block diagram of the down converter.