Vo R O Per Ation ( Typical Contr Ol Settings); Khz Ref Level Control; Counter Mode Switch; Crystal Hi/Lo Switch - IFR NAV-402AP-3 Operation Manual

3.10 VO R 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.
30% or 100% to ver ify or set 30%
modulation of each VO R modulating
tone.
BRG to ver ify oper ation of bear ing
signal at 90 ° ( inter nally) .

2. COUNTER MODE Switch

GEN 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.
3. FREQ UENCY MODE Switch
VO R FIXED is mandator y in r amp
oper ation and is used on bench for a
fixed channel center fr equency.
VO R VAR to check all channel bench
oper ation. Set VAR FREQ Contr ols
to select the desir ed channel in
25 kHz steps.
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.
7. RF O UT Connector
Connect to Receiver Antenna
Connector , or attach Antenna in
r amp oper ation.
O P E R AT I O N M A N U A L
I FF - 7 0 1 T i
STEP
8. TO NE SELECT Switch
Select desir ed tone: 1020 ( Ident
tone) , 400, 1300 or 3000 Hz.
9. 30 Hz VAR LEVEL Contr ol
Var y the 30 Hz modulation level fr om
0% to 30%.
10. 9.96 kHz REF LEVEL Contr ol
Var y the 9.96 kHz modulation level
fr om 0% to 30%.
11. MASTER MO D LEVEL Contr ol
Set to CAL for 30% for each VO R
tone or var iable fr om 3% to 55% for
each VO R tone.
12. 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.
13. VO R BRG SELECT Switches
Set to desir ed bear ing for r adial
testing and alignment.
14. VO R BRG TO /FRO M Switch
Set to obtain r ecipr ocals of selected
bear ings for Indicator flag tests.

15. CRYSTAL HI/LO Switch

(FREQUENCY MODE Switch set to
VO R FIXED)
HI for 112.8 MHz RF output.
L O for 108 MHz RF output.
PROCEDURE
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Jul 1/00