OPERATION MANUAL
NAV-402AP-3
1-2-2
Page 5
Sep 1/04
ITEM DESCRIPTION
10. VAR FREQ Controls
Coarse and fine controls manually
channel sweep the internal Signal
Generator frequency when the
FREQUENCY MODE Switch is in a VAR
position. Clockwise rotation increases
the frequency.
11. TUNE Indicator
Indicates a tuned Signal Generator.
The TUNE Indicator stops illuminating
when the Signal Generator is within the
fine tune range.
12. TUNE Control
NOTE: For maximum accuracy, the
TUNE Control should be
adjusted prior to any receiver
tests.
Adjusts the Signal Generator for optimum
tuning. The TUNE Control requires
readjustment when:
O Selecting a different frequency band
with the FREQUENCY MODE Switch.
O Adjusting VAR FREQ Controls to
change frequency more than a few
MHz in any one band.
O Setting or changing the OUTPUT
ATTENUATOR Control.
13. OUTPUT ATTENUATOR Control
Adjusts the Signal Generator output level
at the RF OUT Connector into a 50 Ω
load. The attenuator dial is calibrated in
-dBm (dB below 1 mW). The dial is
accurate below -30 dBm. Another chart
(also included with the Test Set)
converts -dBm to soft µV.
NOTE: Soft µV are µ V measured with
50 Ω loading. Hard µ V are µV
measured through a 6 dB
attenuator, into a 50 Ω load.
14. FINE TUNE SwitchThis switch fine tunes
the Signal Generator output when the
TUNE Indicator stops illuminating (signal
within tune range). With the FINE TUNE
Switch pressed, the TUNE Control tunes
the signal for minimum deflection from 0
(zero) on the MONITOR Meter.
ITEM DESCRIPTION
15. RF OUT Connector
Provides the attenuated Signal Generator
output to UUT. The connected UUT
should provide a 50 Ω termination to the
RF OUT Connector.
NOTE: The RF OUT Connector is diode
protected against an
accidentally keyed COM
Transmitter.
16. COM XMTR IN Connector
CAUTION: MAXIMUM INPUT SHOULD
STAY WITHIN LIMITS
DEFINED IN
1-3-1, TABLE 2, INPUT
POWER VERSUS TIME
LIMITS.
Provides an input to the MONITOR
Meter. Allows for power and frequency
measurements when connected to a COM
Transmitter using a 50 Ω cable.
When the MONITOR METER FUNCTION
Switch is set to 10W or 100W, the
MONITOR METER indicates COM
Transmitter power, either peak
(AVG/PEAK LOC XMTR ON Switch set to
PEAK LOC) or average (AVG/PEAK LOC
XMTR ON Switch set to AVG). The Test
Set connects an internal 25 dB
attenuator in series with the power
monitor circuit.
When the COUNTER MODE Switch is set
to HZ, KHZ, KHZ or MHZ, the DIGITAL
Display indicates COM Transmitter
frequency.
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