Motorola MTX450 Supplemento al manuale di servizio di base - Pagina 29
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Transceiver Performance Testing
Test
Service Monitor
Name
Reference
Mode: PWR MON
Frequency
4th channel test frequency*
Monitor: Frequency error
Input at RF In/Out
Power RF
As above
Voice
Mode: PWR MON
Modulation
4th channel test frequency*
atten to -70dB, input to RF
In/Out
Monitor: DVM, AC Volts
Set 1kHz Mod Out level for
0.025Vrms at test set,
80mVrms at AC/DC test set
jack
Voice
Mode: PWR MON
Modulation
4th channel test frequency*
(internal)
atten to -70dB, input to RF
In/Out
High-Speed
As above
Data Modu-
lation***
Low-Speed
As above
Data Modu-
lation UHF
DTMF
As above,
Modulation
4th channel test frequency*
PL/DPL
As above
Modulation
4th channel test frequency*
BW to narrow
***MDC
* See Table 4-4 of Basic Service Manual 68P80906Z54 for Test Frequencies.
Table 4-2.
Transmitter Performance Checks
TEST MODE,
Test Channel
4 carrier
squelch
As above
As above
TEST MODE,
Test Channel
4 carrier
squelch out-
put at
antenna
TEST MODE,
Test Channel
4 high speed
output at
antenna
TEST MODE,
Test Channel
4 TLS output
at antenna
TEST MODE,
Test Channel
4 DTMF out-
put at
antenna
TEST MODE,
Test Channel
4
TPL
DPL
Radio
Test Set
PTT to continu-
ous (during the
performance
check)
As above
As above, meter
selector to mic
Remove modu-
lation input
PTT to continu-
ous (during the
performance
check)
PTT to continu-
ous (during the
performance
check)
As above
As above
Comments
Frequency error
±600 Hz UHF
Refer to Specifications
Deviation:
UHF:
≥ 4.0 KHz but ≤ 5.0
kHz (25 KHz Ch Sp)
Global.
4KHz (20 kHz Ch Sp)
U.S. and Canada.
Press PTT switch on
radio. Say "four" loudly
into the radio mic.
Measure deviation:
UHF:
≥ 4.0 kHz but ≤ 5.0
KHz (25 kHz Ch Sp)
Deviation:
UHF: ≥ 2.5 kHz but ≤
3.5 KHz (25 kHz Ch
Sp)
Deviation:
UHF: ≥500Hz but ≤
1000Hz (25 kHz Ch
Sp)
Deviation:
UHF: ≥ 3.05 kHz but ≤
3.45 kHz (25 kHz Ch
Sp)
Deviation:
UHF: ≥500Hz but ≤
1000Hz (25 kHz Ch
Sp)
4-5