Transmitter Performance Checks - Motorola APX 1000 Basic Service Manual

Performance Checks: Transmitter Performance Checks
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)
Voice RF Control: Monitor
Modulation Meter: RF Display
(internal) Display: Bar Graphs
Freq: Selected radio TX
freq.
PL Modulation As above
(radios with
conventional,
clear mode,
coded squelch
operation only)
*
See Table 5-4.
Table 5-7. Transmitter Performance Checks – APX 1000
TEST MODE CSQ
channel* or
programmed
conventional
channel
As above
As above
As above
Conventional
coded squelch
personality (clear
mode operation)
or TPL channel
(test mode*)
Radio Test Set
PTT to continuous
(during the
performance
check).
As above
As above
Remove
modulation input.
PTT to OFF
(center)
PTT to continuous
(during the
performance
check)
Comments
VHF: ±2 ppm (272–348 Hz)
UHF1: ±2 ppm
UHF2: ±2 ppm
700/800 MHz: ±1.5ppm
(1146–1305 Hz)
VHF: 1–5 Watt
UHF1: 1–5 Watt
UHF2: 1–5 Watt
700: 1–2.5 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
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
Deviation:
(12.5 kHz) ≥ 375 Hz but
≤ 500 Hz
(25 kHz) ≥ 500 Hz but
≤ 1000 Hz
5-9