General Dynamics R2600 Series, Operator'S Manual, Page: 119 / 402

4-2.5 Receiver Sensitivity Testing
(20 dB Quieting)
1. With the cursor located within the RF
Control zone, press the
MON
softkey to
remove input signal from the radio.
MON GEN DUPLEX
Monitor Mode
2. With the cursor located within the Display
Control zone, press the
AC VOLTS
softkey
to display the ac voltmeter:
DC
VOLTS
RF
DISPLAY
AC Meter
RF
SCAN
AC
VOLTS
3. Turn on the receiver (unsquelched). In-
crease the receiver volume control to feed
audio noise to the analyzer (at least 1/4 the
rated audio power). Record the noise
reading in dBm.
Meter: AC VOLTMETER
Range: AUTO
0.050 VAC
0 1
+10.0 dBm
4. With the cursor within the RF Control zone,
press the
GEN
softkey.
MON GEN DUPLEX
Generator Mode
Softkey
5. Within the Audio Control zone, set the
modulation off.
Mod Sum: 0.00 kHz
Fixed 1kHz:
Synth: 3.00 kHz
7 kHz
Format Sel: DPL
Code 021
DTMF: 0.00 kHz
Code: 1234567890#ABCD
External: 0.00 kHz
x
x
x
x
6. Within the RF Control zone, adjust the RF
output level until the noise reading is less
than 20 dB from the value recorded in
step 3. Refer to your radio's service manual
to determine if any adjustments are
required.
RF Control:
Preset: - - B/W: NB
GENERATE
Freq:
Output Level: -112 dB
816.5000 MHz
Mon RF In: RF I/O
Modulation Type: FM
Adjust as
Required
NOTE
To convert the RF output level to uV or dBV,
locate the cursor within the Display Control
zone and press the
RF DISPLAY
softkey.
Locate the cursor to units used for Lvl: and
select the required unit using the softkeys.
73