Motorola SL1M, Service Manual

Page: 43 / 89

Transceiver Performance Testing Test Mode 3-7
* See Table 3-3
Table 3-5. Receiver Performance Checks
Test Name
Communications
Analyzer
Radio Test Set Comments
Reference
Frequency Mode: PWR MON
4th channel test
frequency*
Monitor: Frequency error
Input at RF In/Out
TEST MODE,
Test Channel
4 carrier
squelch
output at
antenna PTT to
continuously
transmit (during the
performance
check) Frequency error to be
±201Hz for UHF
±68Hz for VHF
Rated Audio Mode: GEN
Output level: 1.0mV RF
6th channel test
frequency*
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts TEST MODE
Test Channel
6 carrier
squelch PTT to OFF
(center), meter
selector to Audio
PA Set volume
control to 0.4 Vrms
(Through audio jack)
Distortion As above, except to
distortion As above As above Distortion <5.0%
Sensitivity
(SINAD) As above, except
SINAD, lower the RF
level for 12dB SINAD. As above PTT to OFF
(center) RF input to be
<0.3
μ
V
Noise Squelch
Threshold
(only radios
with
conventional
system need
to be tested) RF level set to 1mV RF As above PTT to OFF
(center), meter
selection to Audio
PA, speaker/load to
speaker Set volume
control to 0.4 Vrms
(Through audio jack)
As above, except change
frequency to a
conventional system.
Raise RF level from zero
until radio unsquelches. Out of TEST
MODE;
select a
conventional
system As above Unsquelch to occur at
<0.25
μ
V.
Preferred SINAD = 9
– 10dB
Receiver
BER IFR DMR mode. Signal
generator with O.153 test
pattern TEST MODE,
Digital Mode,
transmit with
O.153 test
pattern Read BER using
Tuner. Adjust RF
level to get 5%
BER RF level to be
<0.25
μ V for 5% BER
Receiver
Rated Audio IFR DMR Mode. Signal
generator with 1031 test
pattern Test Mode,
Digital Mode,
receive 1031
test pattern RF level = -47dBm.
Set audio analyzer
to read Vrms.
Adjust volume to
get rated audio Adjust volume until
Vrms = 0.4 V
(Through audio jack)
Receiver
Audio
Distortion IFR DMR Mode. Signal
generator with 1031 test
pattern As above As above. Then set
audio analyzer to
measure distortion Not exceed 5%
Final Draft