OPERATION MANUAL
NAV-402AP-3
1-2-2
Page 7
Sep 1/04
ITEM DESCRIPTION
23. LOC CENTER Adjust
Varies the amplitude of the 90 Hz tone
and controls exact course centering for
Localizer modulation.
24. LOC VAR DDM/DDM SWEEP AMPLITUDE
Control
Controls variable Localizer DDM/DDM
sweep amplitude when the LOC DDM
Control is set to p and according to LOC
DDM SWEEP Switch setting:
O LOC DDM SWEEP Switch set to O.
Continuously varies LOC pointer
deflection from ccw 0.4 DDM (left)
through 0 DDM to cw 0.4 DDM (right).
O LOC DDM SWEEP Switch set to AL,
S or AR.
Sets the maximum DDM
deflection/sweep amplitude from 0 to
30 µA (±0.0155 DDM) for an
automatic LOC DDM sweep.
25. 9.96 kHz REF LEVEL Control
Adjusts modulation percentage of the
9.96 kHz VAR tone (part of VOR
composite signal) from 0 to 30%. The
9.96 kHz VAR LEVEL Control (outside
larger knob) reaches 30% when turned
past 30 to the stop.
26. 30 Hz VAR LEVEL Control
Adjusts modulation percentage of the
30 Hz VAR tone (part of VOR composite
signal) from 0 to 30%. The 30 Hz VAR
LEVEL Control (inside smaller knob)
reaches 30% when turned past 30 to the
stop.
27. LOC DDM SWEEP Switch
Sets the Localizer sweep mode:
O O allows manual sweep or variable
DDM adjusted by LOC VAR DDM/DDM
SWEEP AMPLITUDE Control.
O AR (arm right) or AL (arm left)
initializes internal sweep circuit to
0 DDM and determines initial sweep
direction prior to selecting sweep
mode (S).
ITEM DESCRIPTION
27. LOC DDM SWEEP Switch (cont)
O S initiates automatic LOC DDM sweep
beginning at 0 DDM and deflecting to
the direction according to the prior
arming setting (AR or AL). The
sweep continues to the maximum
pointer deflection determined by the
LOC VAR DDM/DDM SWEEP
AMPLITUDE Control setting. The
sweep reverses and continues to the
maximum pointer deflection in the
other direction. The sweep is
symmetrical relative to 0 DDM.
28. PWR/BAT Switch
Two position switch controls power to the
Test Set:
O PWR connects Test Set to ac line
power connected to AC IN Connector.
O BAT connects or disconnects Test
Set from internal Battery. Connecting
the Test Set to the Battery activates
an internal battery timer. Test Set
operation disconnects from the
internal Battery after reaching the
internal battery timer limit (≈6 to
10 minutes) or by pressing the
PWR/BAT Switch to BAT to
disconnect.
29. MASTER MOD LEVEL Control
Controls modulation level of all
modulating tones:
O CAL (detent) position (fully ccw) fixes
modulation levels of each type of
signal to normal values; 20% for
LOC, 30% for VOR and COMM, 40%
for G/S and 95% for MKR.
O Other than CAL, adjusts modulation
levels of each type of signal from 3%
to 35% for LOC, 55% for VOR and
COMM, 75% for G/S and 96% for G/S.
