OPERATION MANUAL
NAV-402AP-3
1-2-3
Page 7
Sep 1/04
3.13 COMMUNICATION OPERATION
(RECEIVER TESTS)
(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% sine-
wave modulation tone on the MONITOR
Meter.
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
COM FIXED is mandatory in ramp
operation and is used on bench for a
stable channel center frequency.
COM 25 KHz to check COM Receiver
channels. Set VAR FREQ Controls as
desired from 118.000 to 156.000 MHz,
in 25 KHz steps.
COM 8.33 KHz to check COM Receiver
channels. Set VAR FREQ Controls as
desired from 118.000 to 156.000 MHz,
in 8.33 kHz steps. (1-2-3, Table 1)
4. VAR FREQ Controls (FREQUENCY MODE
Switches set to COM 25 KHz or
COM 8.33 KHz)
Use as needed to change COM frequency
in 25 kHz steps or 8.33 kHz steps as
determined by the frequency mode
switch.
5. TUNE Control
Adjust until TUNE Indicator stops
illuminating, indicating Signal Generator
is in the fine tune range.
6. FINE TUNE Switch
Press and adjust TUNE Control until
MONITOR Meter indicates least
deflection from left.
STEP PROCEDURE
7. OUTPUT ATTENUATOR Control
Use as needed to establish Receiver
sensitivities.
8. RF OUT Connector
Connect to Receiver Antenna Connector,
or attach Antenna in ramp operation.
9. TONE SELECT Switch
Select audio tone: 1020, 400, 1300 or
3000 Hz as desired; or MOD IN to apply
external modulation through MOD IN/EXT
FREQ CTR IN Connector (bench testing
only).
10. MOD IN/EXT FREQ CTR IN Connector
(TONE SELECT Switch set to MOD IN)
Use to apply external modulation to
Signal Generator.
11. MASTER MOD LEVEL Control
Set to CAL for 30% each tone or variable
from 3% to 55%.
12. PWR/BAT Switch
PWR to use external ac line power
through the AC IN Connector.
BAT to initiate operation using internal
Battery power.
