APEX
™
Exciter Incorporating FLO
™
Technology
Details of the Exciter Status Screens
Navigating the LCD Display Screens
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WARNING: Disconnect primary power prior to servicing.
• RF Sample AGC: (Enabled or Disabled), actually an APC, automatic power control.
When enabled, the level of each RF sample (at the output of the down converter) is
adjusted to the correct level required at the input of the ADC (analog to digital con-
verter). It should remain enabled to keep the IF sample signals to the A/D converter at
a constant level.
When disabled, for test purposes, the level of each RF sample (at the output of the
down converter) is set by the blue up and down gain arrows at the bottom of the
screen. The possible range is 0 - 4096. Sample levels can be viewed on the Adaptive
Processing Screen.
• RF Sample tells which down converter RF input sample is currently active.
• RF Level: This is the RF level (taken after the AGC circuit) for the current sample. It
typically ranges between 0.6 to 1.0 Vdc when samples of proper power range are
present at the inputs.
• Gain: This control is only active when RF Sample AGC (on this screen) is defeated. It
is used to set the down converter gain so that the sample level falls between 0.6 and
1.0 Vdc. When RF Sample AGC is enabled the gain required for the active sample is
shown in the “washed out” mode.
3.4.6
System Control Status Screens
The IF & RF Processing Status selection contains five sub screens, which are:
• Controller Board, Screen 1 of 4
• External I/O Board, Screen 2 of 4.
• CAN Status, Screen 3 of 4.
• Front Panel Board, Screen 4 of 4.
• GPS Status.
