Transmit Deviation Balance (Compensation) Alignment - Motorola ASTRO XTS 3500 Basic Service Manual

Transmit
Deviation
Balance
(Compensation)
Alignment
Power Level
1 Watt
5 Watts
6 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
XTS Model: H24SDC9PW5AN
MAIN:SERVICE:TX ALIGN:BAL ATTN
TRANSMIT DEVIATION BALANCE (COMPENSATION)
-----------------------------------------
Frequency
---------
450.025
465.225
475.125
484.975
500.275
511.975
519.975
0
MIN |---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---| MAX
F1 F2 F3
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.
Table 11 Transmit Power Settings
Test Frequencies
136-174MHz 450-512MHz
1.2W - 1.4W 1.2W - 1.4W
———— 5.2W - 5.4W
6.2W - 6.5W
B
to select the TRANSMITTER
Use UP/DOWN Arrows To Adjust Softpot.
Current
Value
-------
30
30
30
45
45
45
45 Transmitter..Off
F4 F5 F6
TOGGLE LOW TOGGLE HIGH
TONE PTT TONE PTT
or [RETURN]) to select a frequency field (starting with
512-520MHz
1.2W - 1.4W
3.2W - 3.4W
———— ————
New Softpot Value
-----------------
30
30
30
45
45
45
45
F7 F8 F9
PROGRAM
VALUE
63
F10
EXIT
19