OPERATION MANUAL
NAV-402AP-3
1-2-2
Page 4
Sep 1/04
ITEM DESCRIPTION
5. FREQUENCY MODE Switch
Selects frequency band to be used:
Marker (MKR), VOR, Localizer (LOC),
Glide Slope (G/S) or COMM. Each band
except COM has two positions; one with
a fixed frequency (FIXED) and the other
with a variable frequency (VAR). The
COM band has three positions; one with
a fixed frequency (FIXED) and two with
variable frequencies (COM 25kHz and
COM 8.33kHz).
6. G/S DDM Control
Selects amount of G/S pointer deviation
of an ILS Indicator under test.
Calibrations in DDM represent standard
deflection (.091), full scale (.175) and
greater than full scale deflections (.400).
Clockwise rotation provides upward
deflection.
The 90 ~ or 150 ~ position deletes the
opposite tone (150 or 90 Hz) and sets
the selected tone (90 or 150 Hz) to the
same level as the on course value (40%)
for a flag test.
NOTE: Setting the LOC DDM Control to
the same 90 ~ or 150 ~ position
when using the Glide Slope
function deletes the selected
Glide Slope tone.
Setting the G/S DDM Control to 90 ~ and
the LOC DDM Control to 150 ~ or vice
versa provides continuous wave (CW)
operation.
The p position allows the G/S VAR DDM
Control to set continuously deviated
deflection.
ITEM DESCRIPTION
7. CRYSTAL HI/LO Switch
Selects high (HI) or low (LO) fixed
frequencies in G/S FIXED or VOR FIXED
modes as selected by the FREQUENCY
MODE Switch. The CRYSTAL HI/LO
Switch also applies modulation to the
appropriate Localizer Transmitter
frequency when FREQUENCY MODE
Switch is set to G/S FIXED. The Test
Set pairs Localizer Transmitter
frequencies with G/S fixed frequencies
when AVG/PEAK LOC XMTR ON Switch
is set to PEAK LOC.
8. COUNTER MODE Switch
Selects signal source to be counted and
shown on the DIGITAL Display:
O GEN measures and display internal
Signal Generator frequency.
O HZ (1 Hz resolution), kHZ (10 Hz
resolution), KHZ (100 Hz resolution)
and MHZ (1 kHz resolution) measures
and displays COM Transmitter
frequency connected to COM XMTR
IN Connector or external signal
frequency connected to MOD IN/EXT
FREQ CTR IN Connector.
O BRG measures and displays digital
bearing circuit output to verify
bearing set by VOR BRG SELECT
Switches. In the BRG position, the
bearing monitor circuits also check
VOR modulation for correct operation
at 90°.
9. METER BEARING CENTER Adjust
Used to center the MONITOR Meter when
the MONITOR METER FUNCTION Switch
is set to BRG and the COUNTER MODE
Switch is set to any position except
BRG.
The METER BEARING CENTER Adjust
sets a reference level in the internal
bearing check operation.
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