Motorola ASTRO Digital XTS 3000 Manuale di servizio di base - Pagina 17
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Performance Checks
Introduction
to This Section
Setup
Test Mode
RF Test Mode
This section covers performance checks used to verify the radio meets
published specifications. The recommended test equipment listed in the
previous section approaches the accuracy of the manufacturing equipment,
with a few exceptions. Accuracy of the equipment must be maintained in
compliance with the manufacturer's recommended calibration schedule.
Supply voltage can be connected from the battery eliminator. The equipment
required for alignment procedures is connected as shown in the "Radio
Alignment Test Setup" diagram (page 13, Figure 1).
Initial equipment control settings should be as indicated in the following
table, and should hold for all alignment procedures except as noted in Table 4.
Table 4 Initial Equipment Control Settings
System Analyzer
Monitor Mode: Pwr Mon
RF Attn: –70dB
AM, CW, FM: FM
O'scope Source: Mod
O'scope Horiz: 10mSec/Div
O'scope Vert: 2.5kHz/Div
O'scope Trig: Auto
Monitor Image: Hi
Monitor BW: Nar
Monitor Squelch: Mid CW
Monitor Vol: 1/4 CW
When the ASTRO Digital XTS 3000 radio is operating in its normal
environment, the radio's microcomputer controls the RF channel selection,
transmitter key-up, and receiver muting. However, when the unit is on the
bench for testing, alignment, or repair, it is removed from its normal
environment. It cannot receive commands from its system and, therefore, the
internal microcomputer will not key the transmitter nor unmute the receiver.
This prevents the use of normal tune-up procedures. To solve this problem a
special routine, called TEST MODE or "air test," has been incorporated in the
radio.
4
Test Set
Spkr Set: A
Voltage: 7.5Vdc
Spkr/Load: Speaker
DC On/Standby: Standby
PTT: OFF (center)
Volt Range: 10Vdc
Current: 2.5Amps
Power Supply
7