Transmitter Performance Checks - Motorola APX 7000 Basic Service Manual

Sec 2: 5-6
Table 5-5. 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.
5.4

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
Radio Tuner
Software not
used;
Radio: Out of
TEST MODE;
Select a
conventional
ASTRO channel
As above
Table 5-6. Transmitter Performance Checks
Radio
TEST MODE CSQ
channel* or
programmed
conventional
channel
As above
As above
Performance Checks: Transmitter Performance Checks
Test Set
PTT to OFF
(center)
Meter selector to
Audio PA
Spkr/Load to
Speaker
As above
Test Set
PTT to continuous
(during the
performance
check).
As above
As above
Comments
Distortion < 3.0%
Residual Audio Noise Ratio
-45 dB
Comments
VHF: 2.0 ppm
(272–348 Hz)
700/800 MHz: 1.5 ppm
(1.15–1.3 kHz)
UHF1: 2 ppm
(760–940 Hz)
UHF2: 2 ppm
(900–1040 Hz)
VHF: 1–6 Watts
700/800 MHz:
764–806 MHz: 2.5 Watts
806–870 MHz: 3 Watts
UHF1: 1–5 Watts
UHF2: 1–5 Watts
Deviation:
(12.5 kHz) ≥ 2.1 kHz, but
≤ 2.5 kHz
(25 kHz) ≥ 4.1 kHz, but
≤ 5.0 kHz