Motorola MOTOTRBO PORTABLE DP4800e - Page 45

Transceiver Performance Testing Display Model Test Mode 3-9
* See Table 3-4
Table 3-7. Receiver Performance Checks
Tes t Na me
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
±68Hz for VHF
±150 Hz for 300 MHz
Band
±175 Hz for 350 MHz
Band
±201Hz for UHF
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 2.83 Vrms
Distortion As above, except to
distortion
As above As above Distortion <3.0%
Sensitivity
(SINAD)
As above, except SINAD,
lower the RF level for
12dB SINAD.
As above PTT to OFF
(center)
RF input to be
<0.23μV for VHF/300/
350 MHz/UHF
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 2.83Vrms
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
<0.25μV.
Preferred SINAD = 9
– 10dB
Receiver
BER
IFR DMR mode. Signal
generator with 1031 test
pattern
Tes t M od e,
Digital Mode,
receive 1031
test pattern
Read BER using
Tuner. Adjust RF
level to get 5%
BER
RF level to be
<0.35μV for 5% BER
Receiver
Rated Audio
IFR DMR Mode. Signal
generator with 1031 test
pattern
Tes t M od e,
Digital Mode,
receive 1031
test pattern
RF level = -47dBm.
Set audo analyzer
to read Vrms.
Adjust volume to
get rated audio
Adjust volume until
Vrms = 2.83V
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%