MFC Functional Test and Tuning (Optional)

Test Goal

Verify that the Manual Frequency Control (MFC) is functioning properly.

Skip this test if you are not using the RVP10 AFC.

Test Equipment

KVM connected

Test Procedure

1. Enter the TTY setups through dspx.

2. Type the Ps command (Plot burst spectrum and AFC).

3. Type 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.

4. 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, go to the Mb command menu and change the question Burst frequency increases with increasing AFC voltage.

5. Using the U/u and D/d commands, verify the limits of the AFC tuning and fill in the following table:

   AFC %	Measured Frequency (MHz)
   -100%	______
   0%	______
   +100%	______

   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.

6. Toggle the MFC mode to AFC:
   1. Type: =
   2. Verify that the terminal indicator changes from Manual toAFC.

7. Exit the Ps menu.

Checklist