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Service Manual
RX Sensitivity Test (SINAD)
Figure 25. RX Test Screen
SINAD
8
22.25
AF Gen1 Freq
RF Gen Freq
879.990000
1 . 0000
MHz
kHz
AF Gen1 To
Amplitude
FM
-116.0
8.00
dBm
Atten Hold
kHz
On / Off
Output Port
RF Out / Dupl
Test Mode Commands:
11333#
Loads synthesizer to chan
nel 333
08#
Unmute receive audio path
58#
Turn on compandor
474#
Set volume control to level 4
356#
Set RX audio path to Ext. Au
dio Path
Sinad measured on the communica-
tions analyzer must be more than
12dB.
Duplex SINAD can be measured with the
same setup by entering 122# and the 05#
test command, which turns on the trans-
mitter at power step 2. Narrow band
SINAD can be measured by entering
571# and setting the FM Deviation to
3kHz. Refer to the RX troubleshooting
section for radios not within the pass
specifications.
RX TEST
dB
AC Level
0.6336
24
-116.0
AF Gen2 Freq
Filter 1
1 . 0000
C message
kHz
RF Out
AF Gen2 To
Filter 2
FM
kHz LPF
15
OFF
Load R
Ext
8 . 00
Motorola Confidential Proprietary
Communications Analyzer Setup:
• Select RX button from the Screen Con
V
trol panel
• Set RX frequency to 879.990 MHz
• Set Amplitude to -116 dBm
• Set AF gen1 to 1 kHz frequency at
8 kHz deviation, using FM modula
To Screen
RF GEN
RF ANL
tion (PLEASE NOTE: this is for AMPS
AF ANL
SCOPE
only; NAMPS uses much lower devia
SPEC ANL
ENCODER
DECODER
tion)
RADIO INT
• Set AF Filter 1 set to C message fil
tering
More
• Set AF Filter 2 to 15 kHz
Test Procedures
RX Sensitivity Test (SINAD)
39
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