Sec 2: 5-14 Performance Checks: Transmitter Performance Checks
Voice
Modulation
(internal)
RF Control: Monitor
Meter: RF Display
Display: Bar Graphs
Freq: Selected radio TX
freq.
As above Remove
modulation input.
PTT to OFF
(center)
Press PTT button on radio.
Say “four” loudly into the
radio mic. Measure
deviation:
(12.5 kHz) ≥ 2.1 kHz but
≤ 2.5 kHz
(25 kHz) ≥ 4.1 kHz but
≤ 5.0 kHz
PL Modulation
(radios with
conventional,
clear mode,
coded squelch
operation only)
As above Conventional
coded squelch
personality (clear
mode operation)
or TPL channel
(test mode*)
PTT to continuous
(during the
performance
check)
Deviation:
(12.5 kHz) ≥ 375 Hz but
≤ 500 Hz
(25 kHz) ≥ 500 Hz but
≤ 1000 Hz
Secure
Modulation
(radios with
conventional,
secure mode,
talkaround
operation only)
As above Programmed
conventional
channel (secure
mode operation)
Load key into
radio.
As above Deviation:
≥ 3.7 kHz but ≤ 4.3 kHz
* See Table 5-4 on page 2:5-6.
Table 5-10. Transmitter Tests for ASTRO Conventional Channels – APX 6000XE*
Test Name System Analyzer Radio Test Set Comments
RF Power Mode: Proj 25 Std
RF Control: Monitor
Meter: RF Display
Radio Tuner
Software not used.
Radio: Out of
TEST MODE;
Select a
conventional
ASTRO channel
PTT to continuous
(during
measurement).
VHF: 1–6 Watts
UHF1: 1–5 Watt
UHF2: 1–5 Watt
700: 1–2.7 Watt
800: 1–3 Watt
Frequency
Error
As above As above As above Error ≤ ±1.0 kHz
Frequency
Deviation
As above Radio Tuner
Software
(Transmitter Test
Pattern screen) is
required)
High use: Symbol
Rate PAT
Low use: Low
Symbol Rate P
PTT to OFF
(center)
D
HIGH
≥ 2.543 kHz but
≤ 3.110 kHz
D
LOW
≥ 0.841 kHz but
≤ 1.037 kHz
(Use test setup shown in
Figure 6-1 on page 2:6-1)
* These tests require a communications system analyzer with the ASTRO 25 test options.
Table 5-9. Transmitter Performance Checks – APX 6000XE (Continued)
Test Name System Analyzer Radio Test Set Comments
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