Performance Testing; Introduction; Receiver Performance Tests - Motorola GP300 Series Basic Service Manual

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
distortion
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
conventional
As above, except change
system need
frequency to a conventional
to 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
Test Channel continuous
4 carrier (during the
squelch performance
output at check)
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
(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
Chapter 4
Comments
Frequency error to be
±200Hz VHF
±600Hz UHF
Set volume control to
3.16Vrms
(GP320/340/360/380)
3.46Vrms
(GP344/388)
Distortion 3.0%
Typical
RF input to be
0.25µV
<0.35µ (GP344/388)
Set volume control to
3.16Vrms
(GP320/340/360/380)
3.46Vrms
(GP344/388)
Unsquelch to occur at
<0.25µV.
Preferred SINAD =
9-10dB