OPERATION MANUAL
NAV-402AP-3
1-2-2
Page 3
Sep 1/04
2.1 FRONT PANEL
Refer to 1-2-2, Figure 2.
ITEM DESCRIPTION
1. MONITOR Meter
Provides, according to MONITOR METER
FUNCTION Switch selection, analog
indication of COM Transmitter RF power,
Signal Generator RF level, Battery
voltage, percent modulation of Signal
Generator or VOR bearing errors at 90°.
2. MONITOR METER FUNCTION Switch
Selects MONITOR Meter function:
O 10W selects 0 to 10 Watt scale
(bottom scale) to measure COM
Transmitter RF power.
O 100W selects 0 to 100 Watt scale
(bottom scale X 10) to measure COM
Transmitter RF power.
O RF indicates best Signal Generator
RF level by adjusting TUNE Control
with FINE TUNE Switch pressed to
set MONITOR Meter to center scale.
O BAT selects 0 to 30% scale in volts
to indicate internal Battery voltage.
A ≥15 V reading indicates a fully
charged Battery. A <12 V reading
indicates a discharged Battery.
O 30% selects 0 to 30% scale to
measure modulation level of Signal
Generator.
O 100% selects 0 to 100% scale to
measure modulation level of Signal
Generator.
O BRG checks VOR Generator at 90°.
Center of the band indicates 0°
bearing error. Left or right meter
scale limit indicates bearing errors of
±0.5%.
ITEM DESCRIPTION
3. LOC DDM Control
Selects amount of LOC pointer deviation
of an ILS Indicator under test.
Calibrations in DDM represent, standard
deflection (.093), full scale (.155) and
greater than full scale deflections (.200).
Clockwise rotation provides upward
deflection.
The 150 ~ or 90 ~ position deletes the
opposite tone (90 or 150 Hz) and sets
the selected tone (150 or 90 Hz) to the
same level as the on course value
(20%) for a flag test.
NOTE: Setting the G/S DDM Control to
the same 150 ~ or 90 ~ position
when using the Localizer
function deletes the selected
Localizer tone.
Setting the LOC DDM Control to 150 ~
and the G/S DDM Control to 90 ~ or vice
versa provides continuous wave
operation.
The p position allows the LOC VAR
DDM/DDM SWEEP AMPLITUDE Control
to set continuously deviated deflection.
4. DIGITAL Display
Provides digital readout of selected VOR
bearing, internal Signal Generator
frequency, external signal frequency or
COM Transmitter frequency. The
COUNTER MODE Switch determines
displayed function.
