Motorola ASTRO Digital XTS 3000 Базовий посібник з обслуговування - Сторінка 27
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Transmit
Deviation
Balance
(Compensation)
Alignment
800MHz Power Level
3 Watts
F
5. Press
to dekey the radio.
H
6. Press
to program the value.
7. Repeat steps 3-6 for the remaining frequencies.
J
8. Press
once to return to the TRANSMITTER ALIGNMENT MENU, or
J
press
twice to return to the SERVICE MENU.
Compensation alignment balances the modulation sensitivity of the VCO and
reference modulation (synthesizer low-frequency port) lines. The
compensation algorithm is critical to the operation of signalling schemes that
have very-low-frequency components (for example, DPL) and could result in
distorted waveforms if improperly adjusted.
1. From the SERVICE MENU, press
ALIGNMENT MENU.
D
2. Press
to select the TRANSMIT DEVIATION BALANCE
(COMPENSATION) alignment screen. The screen will indicate the
transmit frequencies to be used. See Figure 6.
MOTOROLA Radio Service Software
ASTRO
Model: H09UCH9PW7AN
MAIN:SERVICE:TX ALIGN:BAL ATTN
Frequency
---------
806.000
815.000
824.000
851.000
860.000
869.000
0
MIN |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---| MAX
F1
F2
HELP
Figure 6 Transmit Deviation Balance (Compensation) Alignment Screen
P
Z
3. Press
(or
the lowest frequency shown).
D
4. Press
. This will cause the radio to key and the radio's DSP IC to inject
an 80Hz tone into the RF board.
5. Measure the deviation and record this value.
D
6. Press
to dekey the radio.
Table 10 Transmit Power Setting
All Test Frequencies
B
to select the TRANSMITTER
Use UP/DOWN Arrows To Adjust Softpot.
TRANSMIT DEVIATION BALANCE (COMPENSATION)
-----------------------------------------
Current
Value
-------
30
30
30
45
45
45
Transmitter..Off
F3
F4
F5
F6
TOGGLE LOW
TOGGLE HIGH
TONE PTT
TONE PTT
or [RETURN]) to select a frequency field (starting with
3.2 - 3.4
New Softpot Value
-----------------
30
30
30
45
45
45
F7
F8
F9
PROGRAM
VALUE
63
F10
EXIT
17