Sec 2: 5-6 Performance Checks: Transmitter Performance Checks
5.4 Transmitter Performance Checks
The following tables outline the performance checks for the transmitter.
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.
Table 5-6. Transmitter Performance Checks
Test Name System Analyzer Radio Test Set Comments
Reference
Frequency
RF Control: Monitor
Meter: RF Display
Display: Bar Graphs
Freq: Selected radio TX
freq.
TEST MODE CSQ
channel* or
programmed
conventional
channel
PTT to continuous
(during the
performance
check).
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)
RF Power As above As above As above VHF: 1–6 Watts
700/800 MHz:
764–806 MHz: 2.5 Watts
806–870 MHz: 3Watts
UHF1: 1–5 Watts
UHF2: 1–5 Watts
Voice
Modulation
(external)
As above. Set fixed 1 kHz
audio level to 400 mV.
As above As above Deviation:
(12.5 kHz) ≥ 2.1 kHz, but
≤ 2.5 kHz
(25 kHz) ≥ 4.1 kHz, but
≤ 5.0 kHz
Table 5-5. Receiver Tests for ASTRO Conventional Channels* (Continued)
Test Name System Analyzer Radio Test Set Comments
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