User Manual

15
Adjustin g th e softpot value sen ds in form ation to th e radio to in crease
(or decrease) a dc voltage in th e correspon din g circuit. For exam ple,
pressin g th e UP arrow key at th e Referen ce Oscillator screen in structs
th e radio’s m icrocom puter to in crease th e voltage across a varactor in
th e referen ce oscillator, wh ich in creases th e frequen cy.
In ALL cases, th e softpot value is just a relative n um ber correspon din g
to a digital-to-an alog (D/A) gen erated voltage in th e radio.
Perfo rm th e fo llo w in g procedures in th e sequen ce in dicated.
NOTE: Som e of th e followin g screen s m ay
vary depen din g upon th e radio un der
test an d th e version of radio service
software you are usin g. Refer to your
radio service software user’s guide.
Reference
Oscillat or
Alignment
Adjustm en t of th e referen ce oscillator is critical for proper radio
operation . Im proper adjustm en t will result n ot on ly in poor operation ,
but also in a m isalign ed radio th at will in terfere with oth er users
operatin g on adjacen t ch an n els. For th is reason , th e referen ce
oscillator sh ould be ch ecked every tim e th e radio is serviced. Th e
frequen cy coun ter used for th is procedure m ust h ave a stability of 0.1
ppm (or better).
1. From th e SERVICE MENU, press
B
to select th e TRANSMITTER
ALIGNMENT MENU.
2. Press
B
again to select th e REFERENCE OSCILLATOR align m en t
screen . See Figure 4.
Figure 4 Reference Oscillator Alignm ent Screen
3. Press
P
(or
Z
or [RETURN]) to select a frequen cy field
(startin g with th e h igh est frequen cy sh own ). Th en , press
F
to
key th e radio. Th e screen will in dicate th at th e radio is
tran sm ittin g.
MOTOROLA Radio Service Software Use UP/DOWN Arrows To Adjust Softpot.
ASTRO Model: H09UCH9PW7AN
MAIN:SERVICE:TX ALIGN:REF OSC
REFERENCE OSCILLATOR
--------------------
Frequency Current Value
--------- -------------
869.9875 150 New Softpot Value.....150
Transmitter..On
0 255
MIN |----+----+----+----+----+----+----+----+----+----+----+----| MAX
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10
HELP TOGGLE PROGRAM EXIT
PTT VALUE