A2537-002/01 February 2020 4-2 SEMCO Proprietary Information
Figure 4-3
RF Frequency Selection from The Tuner Menu
4.1.1.1 Front Panel C/CIF-Band Frequency Settings
C-Band (4400 MHz to 5250 MHz) is tuned in the same manner as previously described in paragraph 4.1.1.
However, CIF-Band (300 MHz to 1150 MHz) down-conversion from C-band uses high-side mixing (i.e.,
5550 MHz Synthesizer) per IRIG, and the down-converted frequency spectrum is inverted. Once the CIF
frequency is selected per paragraph 4.1.1, a CIF Mode (CIF En.) is added to correct the inverted spectrum.
Figure 4-4 illustrates the process for enabling the CIF Mode. The operator pushes the TUNER button to
access the Tuner Menu, uses the UP (2) and DOWN (8) arrows to highlight CIF En. in blue as shown,
pushes ENTER or SELECT (5) to highlight OFF/ON in bright magenta, pushes the DOWN (8) arrow to
select ON, and then pushes ENTER or SELECT (5) to turn <Ch1> CIF En. ON.
The operator then uses the horizontal LEFT (4) and RIGHT (6) arrows to change the Tuner Menu to
<Ch2>, pushes ENTER or SELECT (5) to highlight the CIF En. OFF/ON value in bright magenta, pushes
the DOWN (8) arrow to select ON, and then pushes ENTER or SELECT (5) to turn <Ch2> CIF En. ON.
The user then presses DELETE (EXIT) to return the display to its original setting.
Figure 4-4
RF CIF Frequency Selection from The Tuner Menu
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