Transmitter Performance Checks - Motorola APX 5000 Service Manual

Performance Checks: Transmitter Performance Checks
Table 5-8. Receiver Tests for ASTRO Conventional Channels* (Continued)
Test Name System Analyzer
Audio Output Mode: Proj 25 Std
Distortion RF Control: Gen
Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code: 1011 Hz PAT
Meter: Ext. Distortion
Residual Mode: Proj 25 Std
Audio Noise RF Control: Gen
Ratio Output Level: -47 dBm
Proj 25 Dev: 2.83 kHz
Code:
A) 1011 Hz PAT
B) Silence PAT
Meter: AC Volts
*
These tests require a communications system analyzer with the ASTRO 25 test options.
5.5

Transmitter Performance Checks

The following tables outline the performance checks for the transmitter.
Test Name System Analyzer
Reference RF Control: Monitor
Frequency Meter: RF Display
Display: Bar Graphs
Freq: Selected radio TX
freq.
RF Power As above
Voice As above. Set fixed 1 kHz
Modulation audio level to 400 mV.
(external)
Radio Tuner
Software not used;
Radio: Out of
TEST MODE;
Select a
conventional
ASTRO channel
As above
Table 5-9. Transmitter Performance Checks – APX 6000XE
TEST MODE CSQ
channel* or
programmed
conventional
channel
As above
As above
Radio Test Set
PTT to OFF
(center)
Meter selector to
Audio PA
Spkr/Load to
Speaker
As above
Radio Test Set
PTT to continuous
(during the
performance
check).
As above
As above
Sec 2: 5-13
Comments
Distortion < 3.0%
Residual Audio Noise Ratio
-45 dB
Comments
VHF: ±0.8 ppm
(±140 Hz)
UHF1: ±0.8 ppm
(±376 Hz)
UHF2: ±0.8 ppm
(±416 Hz)
700–800 MHz: ±0.8 ppm
(±696 Hz)
VHF: 1–6 Watts
UHF1: 1–5 Watt
UHF2: 1–5 Watt
700: 1–2.7 Watt
800: 1–3 Watt
Deviation:
(12.5 kHz) ≥ 2.1 kHz, but
≤ 2.5 kHz
(25 kHz) ≥ 4.1 kHz, but
≤ 5.0 kHz