Motorola ASTRO Digital XTS 3000 Базовое руководство по обслуживанию - Страница 20
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Test Name
Reference
Mode: PWR MON 4th
Frequency
channel test frequency
Monitor: Frequency error.
Input at RF In/Out
Rated Audio
Mode: GEN
Output level: 1.0mV RF 4th
channel test frequency
Mod: 1kHz tone at 3kHz
deviation
Monitor: DVM: ac Volts
Distortion
As above, except to
distortion
Sensitivity
As above, except SINAD;
(SINAD)
lower the RF level for 12dB
SINAD
Noise Squelch
RF level set to 1mV RF
Threshold (only
radios with
conventional
system need to
As above, except change
be tested)
frequency to a
conventional system. Raise
RF level from zero until
radio unsquelches.
See Table 6
10
Press the left-hand M key on the top row of keys, "
-
131/0
release, "
Press the center N key, "
-
Press the right-hand M key, "
-
133/0
"
" appears.
Table 7 Receiver Performance Checks
System Analyzer
" appears.
132/1
" appears; release, "
133/1
Radio
Test Set
TEST MODE,
PTT to continuous
4 CSQ output
(during the
at antenna
performance check)
TEST MODE,
PTT to OFF (center);
4 CSQ
meter selector to Audio
PA
As above
As above
As above
PTT to OFF (center)
As above
PTT to OFF (center);
meter selection to
Audio PA; spkr/load to
speaker
Out of TEST
As above
MODE; select
a conventional
system
131/1
" appears;
132/0
" appears.
" appears; release,
Comments
Frequency error to
be ≤ ±1.2kHz
Set volume control
to 3.74Vrms
Distortion < 3.0%
RF input to be <
0.35µV
Set volume control
to 3.74Vrms
Unsquelch to
occur at < 0.25µV.
Preferred SINAD =
8-10dB