OPERATION MANUAL
NAV-402AP-3
1-2-3
Page 4
Sep 1/04
3.10 VOR OPERATION
(TYPICAL CONTROL SETTINGS)
STEP PROCEDURE
1. MONITOR METER FUNCTION Switch
RF to verify proper leveling of internal
Signal Generator on the MONITOR
Meter.
30% or 100% to verify or set 30%
modulation of each VOR modulating
tone.
BRG to verify operation of bearing signal
at 90° (internally).
2. COUNTER MODE Switch
GEN to read out the Signal Generator
frequency on the DIGITAL Display when
operating in fixed (FIXED) or variable
(VAR) modes.
3. FREQUENCY MODE Switch
VOR FIXED is mandatory in ramp
operation and is used on bench for a
fixed channel center frequency.
VOR VAR to check all channel bench
operation. Set VAR FREQ Controls to
select the desired channel in 25 kHz
steps.
4. TUNE Control
Adjust until TUNE Indicator stops
illuminating, indicating Signal Generator
is in the fine tune range.
5. FINE TUNE Switch
Press and adjust TUNE Control until
MONITOR Meter indicates least
deflection from left.
6. OUTPUT ATTENUATOR Control
Use as needed to establish Receiver
sensitivities.
7. RF OUT Connector
Connect to Receiver Antenna Connector,
or attach Antenna in ramp operation.
8. TONE SELECT Switch
Select desired tone: 1020 (Ident tone),
400, 1300 or 3000 Hz.
STEP PROCEDURE
9. 30 Hz VAR LEVEL Control
Vary the 30 Hz modulation level from 0%
to 30%.
10. 9.96 kHz REF LEVEL Control
Vary the 9.96 kHz modulation level from
0% to 30%.
11. MASTER MOD LEVEL Control
Set to CAL for 30% for each VOR tone or
variable from 3% to 55% for each VOR
tone.
12. PWR/BAT Switch
PWR to use external ac line power
through the AC IN Connector.
BAT to initiate operation using internal
Battery.
13. VOR BRG SELECT Switches
Set to desired bearing for radial testing
and alignment.
14. VOR BRG TO/FROM Switch
Set to obtain reciprocals of selected
bearings for Indicator flag tests.
15. CRYSTAL HI/LO Switch (FREQUENCY
MODE Switch set to VOR FIXED)
HI for 112.8 MHz RF output.
LO for 108 MHz RF output.
