Motorola ASTRO XTS 3000 Service Manual page 41

XTS 3000 ASTRO Digital Radio Basic Service Manual
Figure 7-2 RSS Service Menu Layout
SERVICE
All Service screens read and program the radio codeplug directly; you do NOT have to use
the RSS Get/Save functions to use the Service menus.
The Service screens introduce the concept of the softpot, an analog SOFTware-controlled
POTentiometer used for adjusting all transceiver alignment controls.
Each Service screen provides the capability to increase or decrease the 'softpot' value with the
keyboard Up/Down arrow keys. A graphical scale is displayed indicating the minimum, maximum,
and proposed value of the softpot, as shown in
Figure 7-3 Softpot Concept
0
Min.
Value
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.
68P81083C85-A March 2004
F2 -
TRANSMITTER ALIGNMENT MENU
F1 -
HELP
F2 -
REFERENCE OSCILLATOR ALIGNMENT
F3 -
TRANSMIT POWER ALIGNMENT
F4 -
TRANSMIT DEVIATION BALANCE
(COMPENSATION) ALIGNMENT
F5 -
TRANSMIT DEVIATION LIMIT ALIGNMENT
F10 -
EXIT, RETURN TO SERVICE MENU
F3 -
RECEIVER ALIGNMENT MENU
F2 -
FRONT END BANDPASS FILTER ALIGNMENT
Figure 7-3.
15
Max.
Value
General
7-3