Motorola APX 4000, Basic Service Manual

Page: 397 / 526

Performance Checks : Receiver Performance Checks 5-9
Table 5-7. Receiver Tests for ASTRO Conventional Channels*
Test Name System Analyzer Radio Test Set Comments
Bit Error rate
(BER) Floor Mode: Proj 25 Std
RF Control: Gen
Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code: 1011 Hz PAT
Radio Tuner
Software (Bit Error
Rate screen) is
required PTT to OFF
(center)
BER < 0.01%
(Use test setup shown in
Figure 6-1
)
Reference
Sensitivity As above; lower the
output level until 5% BER
is obtained As above As above Output level < 0.35 µV
(-116 dBm)
(Use test setup shown in
Figure 6-1
)
Audio Output
Distortion Mode: Proj 25 Std
RF Control: Gen
Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code: 1011 Hz PAT
Meter: Ext. Distortion
Radio Tuner
Software not used;
Radio: Out of
TEST MODE;
Select a
conventional
ASTRO channel
PTT to OFF
(center)
Meter selector to
Audio PA
Spkr/Load to
Speaker
Distortion < 3.0%
Residual
Audio Noise
Ratio Mode: Proj 25 Std
RF Control: Gen
Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code :
A) 1011 Hz PAT
B) Silence PAT
Meter: AC Volts
As above As above Residual Audio Noise Ratio
-45 dB
*
These tests require a communications system analyzer with the ASTRO 25 test options.