Motorola T2290, Service Manual, Page: 49 / 129

Motorola Confidential Proprietary
Test Procedures Service Manual
39
RX TEST
SINAD
dB V
AC Level
8 22.25 24
0.6336
RF Gen Freq
MHz
879.990000
Amplitude
-116.0
dBm
-116.0
RF Out
Atten Hold
Output Port
RF Out / Dupl
On / Off
AF Gen1 Freq
1 . 0000
kHz
AF Gen1 To
FM
kHz
8.00
AF Gen2 Freq
1 . 0000
kHz
AF Gen2 To
FM
OFF
Filter 1
C message
Filter 2
15
kHz LPF
Ext
Load R
8 . 00
To Screen
RF GEN
RF ANL
AF ANL
SCOPE
SPEC ANL
ENCODER
DECODER
RADIO INT
More
RX Sensitivity Test (SINAD)
Communications Analyzer Setup:
• Select RX button from the Screen Con
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
tion (PLEASE NOTE: this is for AMPS
only; NAMPS uses much lower devia
tion)
• Set
AF Filter 1
set to
C message fil
tering
• Set AF Filter 2 to 15 kHz
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.
Figure 25. RX Test Screen
RX Sensitivity Test (SINAD)