February 3, 2003 6881076C20-E
6-2 Radio Alignment Procedure: RSS
Figure 6-2. RSS Service Menu Layout
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.
6.2.2 Softpot
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 respectively. A graphical scale is displayed indicating the minimum,
maximum, and proposed value of the softpot, as shown in
Figure 6-3.
Figure 6-3. Softpot Concept
Adjusting the softpot value sends information to the radio to increase (or decrease) 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 alignment 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.
REFERENCE OSCILLATOR ALIGNMENT
TRANSMIT CURRENT LIMIT
TRANSMITTER ALIGNMENT MENU
TRANSMIT DEVIATION BALANCE
(COMPENSATION) ALIGNMENT
TRANSMIT DEVIATION LIMIT ALIGNMENT
F2 -
F2 -
F4 -
F5 -
F6 -
SERVICE
HELPF1 -
EXIT, RETURN TO SERVICE MENUF10 -
TRANSMIT POWER ALIGNMENTF3 -
Min.
Value
Max.
Value
015
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