Comtech EF Data KST-12000 - Manual (Page 104)

KST-12000 Ku-Band Satellite Terminal Revision 4
Theory of Operation MN/KST12000.IOM
5.6.2 Theory of Operation
The RFT-1200 employs the up converter to convert a baseband 70 MHz input IF signal to
a Ku-band RF output signal at 14.0 to 14.5 GHz (refer to Figure 5-9).
• The first frequency conversion mixes the input IF signal 70 MHz ( ± 18 MHz)
with the IFLO input at 1150 MHz, to up convert to the second IF of 1220 MHz.
• The second conversion mixes the second IF signal with the synthesizer input of
12.75 to 13.28 GHz, to up convert to the final RF output band of 14.0 to
14.5 GHz.
The synthesizer input is generated externally by the up converter synthesizer. The IFLO
is also generated externally by the IFLO assembly.
The input power level of both the synthesizer and IFLO will be at a nominal +8 to
+10 dBm coming into the up converter.
The M&C board interpolates the factory preset compensation data that is stored in an
EEPROM inside the up converter. This data allows the M&C board to command and
compensate the up converter’s output power, ensuring proper output power levels over
the entire frequency and temperature range.
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