Marker Operation (Typical Control Settings) - IFR NAV-402AP-3 Operation Manual

3.9 MARKER OPERATION
(TYPICAL CONTROL SETTINGS)
STEP PROCEDURE
1. MONITOR METER FUNCTION
Switch
RF to ver ify pr oper leveling of
inter nal Signal G ener ator on the
MONITOR Meter.
100% to ver ify 95% modulation of
Signal G ener ator on the MO NITO R
Meter .
2. FREQ UENCY MODE Switch
MKR FIXED is mandator y in r amp
oper ation and is used on bench for
standar d Mar ker center fr equency.
MKR VAR Set VAR FREQ Contr ols
to select the desir ed channel in
25 kHz steps.
3. COUNTER MODE Switch
G EN to r ead out the Signal
G ener ator fr equency on the DIG ITAL
Display when oper ating in fixed
( FIXED) or var iable ( VAR) modes.
4. TUNE Contr ol
Adjust until TUNE Indicator stops
illuminating, indicating Signal
G ener ator is in the fine tune r ange.
5. FINE TUNE Switch
Pr ess and adjust TUNE Contr ol until
MO NITO R Meter indicates least
deflection fr om left.
6. OUTPUT ATTENUATOR Control
Use as needed to establish Receiver
sensitivities.
O P E R AT I O N M A N U A L
I FF - 7 0 1 T i
STEP
7. RF O UT Connector
Connect to Receiver Antenna
Connector , or attach Antenna in
r amp oper ation.
8. TO NE SELECT Switch
Select desir ed tone: 1020 ( Ident
tone) , 400, 1300 or 3000 Hz.
9. MASTER MO D LEVEL Contr ol
Set to CAL for 95% or var iable fr om
3% to 96%.
10. PWR/BAT Switch
PWR to use exter nal ac line power
thr ough the AC IN Connector .
BAT to initiate oper ation using
inter nal batter y.
PROCEDURE
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