Motorola ASTRO Digital XTS 3000 Grundlegendes Servicehandbuch - Seite 25
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Reference
Oscillator
Alignment
Adjusting the softpot value sends information to the radio to increase
(or decrease) a dc voltage in the corresponding circuit. For example,
pressing the UP arrow key at the Reference Oscillator screen instructs
the radio's microcomputer to increase the voltage across a varactor in
the reference oscillator, which increases the frequency.
In ALL cases, the softpot value is just a relative number corresponding
to a digital-to-analog (D/A) generated voltage in the radio.
Perform the following procedures in the sequence indicated.
NOTE:
Some of the following screens may
vary depending upon the radio under
test and the version of radio service
software you are using. Refer to your
radio service software user's guide.
Adjustment of the reference oscillator is critical for proper radio
operation. Improper adjustment will result not only in poor operation,
but also in a misaligned radio that will interfere with other users
operating on adjacent channels. For this reason, the reference
oscillator should be checked every time the radio is serviced. The
frequency counter used for this procedure must have a stability of 0.1
ppm (or better).
1. From the SERVICE MENU, press
ALIGNMENT MENU.
B
2. Press
again to select the REFERENCE OSCILLATOR alignment
screen. See Figure 4.
MOTOROLA Radio Service Software
ASTRO
Model: H09UCH9PW7AN
MAIN:SERVICE:TX ALIGN:REF OSC
Frequency
Current Value
---------
-------------
869.9875
150
0
MIN |----+----+----+----+----+----+----+----+----+----+----+----| MAX
F1
F2
F3
HELP
Figure 4 Reference Oscillator Alignment Screen
P
Z
3. Press
(or
(starting with the highest frequency shown). Then, press
key the radio. The screen will indicate that the radio is
transmitting.
B
to select the TRANSMITTER
Use UP/DOWN Arrows To Adjust Softpot.
REFERENCE OSCILLATOR
--------------------
New Softpot Value.....150
Transmitter..On
F4
F5
F6
F7
TOGGLE
PTT
or [RETURN]) to select a frequency field
255
F8
F9
F10
PROGRAM
EXIT
VALUE
F
to
15