Receiver Performance Checks - Motorola APX 5000 Service Manual

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Sec 2: 5-12
5.4

Receiver Performance Checks

The following tables outline the performance checks for the receiver.
Test Name
System Analyzer
Reference
RF Control: Monitor
Frequency
Meter: RF Display
Display: Bar Graphs
Freq: Selected radio TX
freq.
Rated Audio
RF Control: Gen
Output Level: -47 dBm
Freq: Selected radio RX
freq.
Mod: 1 kHz tone @ 3 kHz
dev.
Meter: AC Volts
Distortion
As above, except
Meter: Ext Dist.
Sensitivity
As above, except
(SINAD)
Meter: SINAD
Noise Squelch
Set as for rated audio
Threshold
check
(only radios
with
conventional
system need
to be tested)
*
See
Table 5-4 on page
Test Name
System Analyzer
Bit Error rate
Mode: Proj 25 Std
(BER) Floor
RF Control: Gen
Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code: 1011 Hz PAT
Reference
As above; lower the
Sensitivity
output level until 5% BER
is obtained
Table 5-7. Receiver Performance Checks
TEST MODE CSQ
channel* or
programmed
conventional
channel
As above
As above
As above
Out of TEST
MODE; select a
conventional
system
2:5-6.
Table 5-8. Receiver Tests for ASTRO Conventional Channels*
Radio Tuner
Software (Bit Error
Rate screen) is
required
As above
Performance Checks: Receiver Performance Checks
Radio
Test Set
PTT to continuous
(during the
performance
check)
PTT to OFF
(center)
Load Selector: A
As above
As above
As above
Radio
Test Set
PTT to OFF
(center)
As above
Comments
VHF: ±0.8 ppm
(±227 Hz)
UHF1: ±0.8 ppm
(±289 Hz)
UHF2: ±0.8 ppm
(±329 Hz)
700-800 MHz: ±0.8 ppm
(±709 Hz)
Set volume control to
3.74 Vrms
Distortion < 3.0%
RF input to be < 0.35 µV
Set volume control to
3.74 Vrms.
Set RF level to -130 dBm
and raise until radio
unsquelches.
Unsquelch to occur at
< 0.25 µV. Preferred SINAD
= 6-8 dB.
Comments
BER < 0.01%
(Use test setup shown in
Figure 6-1 on page
2:6-1)
Output level < 0.35 µV
(-116 dBm)
(Use test setup shown in
Figure 6-1 on page 2:6-1)

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