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)
Secure As above
Modulation
(radios with
conventional,
secure mode,
talkaround
operation only)
*
See Table 5-4.
Table 5-7. Transmitter Performance Checks – APX1000
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*)
Programmed
conventional
channel (secure
mode operation)
Load key into
radio.
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)
As above
Comments
900 MHz: ±1.5ppm
900 MHz: 1–2.5 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
Deviation:
≥ 3.7 kHz but ≤ 4.3 kHz
5-9