Comtech EF Data KST-12000 - Manual (Page 99)

KST-12000 Ku-Band Satellite Terminal Revision 4
Theory of Operation MN/KST12000.IOM
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.
5.5.1 Specifications
Input Frequency 10.95 to 12.75 GHz
10.95 to 11.7 GHz
11.7 to 12.2 GHz
12.25 to 12.75 GHz
Input Connector SMA female
Input Impedance 50 Ω
Input VSWR 1.25:1
Output Frequency 70 MHz ( ± 18 MHz)
Output Connector SMA Female
Output VSWR 1.25:1
1 dB Compression +17 dBm
1st IF Synthesizer Input
Frequency 9.73 to 11.53 GHz (RCV 10.95 to 12.75 GHz)
9.73 to 10.48 GHz (RCV 10.95 to 11.7 GHz)
10.48 to 10.98 GHz (RCV 11.7 to 12.2 GHz)
11.03 to 11.53 GHz (RCV 12.25 to 12.75 GHz)
Level +8 dBm
Connector SMA Female
Return Loss 10 dB
Impedance 50 Ω
2nd IF Local Oscillator Input
Frequency 1150 MHz
875 MHz
Level +8 dBm
Connector SMA Female
Return Loss 14 dB
Impedance 50 Ω
5–15