USER’S MANUAL__________________________________________________________________
384 _________________________________________________________________ M211322EN-D
C.18 MFC Functional Test and Tuning (Optional)
Test Goal
Verify that the Manual Frequency Control (MFC) is functioning properly.
Special Test Equipment
- KVM connected
Reference
-See Section 5.4 Ps — Plot Burst Spectra and AFC on page 148
Test Procedure
1. Enter the "Ps" command (Plot burst spectrum and AFC).
2. Use the "=" command to enter the MFC (manual frequency control)
mode. Verify that the MFC mode is indicated by the "Manual"
notation next to the AFC % output indicator on the terminal.
3. Use the U/u and D/d commands and verify that these commands shift
the measured IF frequency (as displayed on the TTY) either up or
down. The "U" command should increase the frequency and the "D"
command should decrease the frequency. If the sense is reversed, then
go to the "Mb" command menu and change the question "Burst
frequency increases with increasing AFC voltage".
4. Using the U/u and D/d commands, verify the limits of the AFC tuning
and fill in the chart below:
The 0% AFC value should be within approximately ±0.2 MHz of the
center IF frequency (for example, 30 MHz). The values at ±100%
should correspond to approximately ± 7 MHz of the center IF
frequency, or at the maximum span that is supported by the STALO;
whichever is less.
5. Toggle the MFC mode to AFC by typing the "=" symbol and verify
that the terminal indicator changes from "Manual" to "AFC".
6. Exit the Ps menu.
NOTE
Skip this test if you are not using the RVP900 AFC.
AFC % Measured Freq (MHz)
-100% ____________
0% ____________
+100% ____________
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