Motorola GP140 Series, Базовое руководство по обслуживанию, Страница: 35 / 46

Chapter 4
PERFORMANCE TESTING
1.0 Introduction
The receiver and transmitter performance tests are contained in Tables 4-1 and 4-2 respectively.
Refer to Chapter 5 for the test equipment set up. Note that all test measurements are taken at 25
°
C.
2.0 Receiver Performance Tests
The receiver performance tests are described in Table 4-1 below.
Table 4-1 Receiver Performance Checks
Test Name
Communications
Analyzer
Radio Test Set Comments
Reference
Frequency Mode: PWR MON
Monitor: Frequency error
Input at RF In/Out TEST MODE,
Test Channel
4 carrier
squelch out-
put at
antenna PTT to continu-
ous (during the
performance
check) Frequency error to be
±
200Hz VHF
±
600Hz UHF
Rated Audio Mode: GEN
Output level: 1.0mV RF
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts TEST MODE
Test Channel
4 carrier
squelch PTT to OFF
(centre), meter
selector to
Audio PA Set volume control to
3.16Vrms
Distortion As above, except to distor-
tion As above As above Distortion 3.0%
Typical
Sensitivity
(SINAD) As above, except SINAD,
lower the RF level for 12dB
SINAD. As above PTT to OFF
(centre) RF input to be
0.25
m
V
Noise
Squelch
Threshold
(only radios
with conven-
tional sys-
tem need to
be tested) RF level set to 1mV RF As above PTT to OFF
(centre), meter
selection to
Audio PA, spkr/
load to speaker Set volume control to
3.16Vrms
As above, except change fre-
quency 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
m
V.
Preferred SINAD =
9-10dB