Motorola GP1280 Series Panduan Servis Dasar - Halaman 37
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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.
Test Name
Reference
Mode: PWR MON
Frequency
Monitor: Frequency error
Input at RF In/Out
Rated Audio
Mode: GEN
Output level: 1.0mV RF
Mod: 1kHz tone at
3kHz deviation
Monitor: DVM: AC Volts
Distortion
As above, except to distor-
tion
Sensitivity
As above, except SINAD,
(SINAD)
lower the RF level for 12dB
SINAD.
Noise
RF level set to 1mV RF
Squelch
Threshold
(only radios
with conven-
tional sys-
As above, except change fre-
tem need to
quency to a conventional
be tested)
system. Raise RF level from
zero until radio unsquelches.
Table 4-1 Receiver Performance Checks
Communications
Analyzer
PERFORMANCE TESTING
Radio
Test Set
TEST MODE,
PTT to continu-
Test Channel
ous (during the
4 carrier
performance
squelch out-
check)
put at
antenna
TEST MODE
PTT to OFF
Test Channel
(centre), meter
4 carrier
selector to
squelch
Audio PA
As above
As above
As above
PTT to OFF
(centre)
As above
PTT to OFF
(centre), meter
selection to
Audio PA, spkr/
load to speaker
out of TEST
As above
MODE; select
a
conventional
system
Chapter 4
Comments
Frequency error to be
± 200Hz VHF
± 600Hz UHF
Set volume control to
3.16Vrms
Distortion 3.0%
Typical
RF input to be
0.25 µ V
Set volume control to
3.16Vrms
Unsquelch to occur at
<0.25 µ V.
Preferred SINAD =
9-10dB