User`s guide

69
Transmit Deviation
Balance
(Compensation)
Alignment
From the MAIN MENU, press F2 twice and then F4 to access this
screen.
Refer to your Radio Service Manual for the Transmit Deviation Balance
Alignment (Compensation) procedure.
This alignment procedure balances the modulation contributions of
the low and high frequency portions of a baseband signal. Power
alignment is critical to the operation of signalling schemes that have
very low frequency components (i.e., DPL) and could result in
distorted wave-forms if improperly adjusted.
This procedure must be performed at multiple frequencies to allow for
proper alignment across the entire RF band. The RF band is divided
into frequency zones with a calibration point (value) in each zone.
Balanced attenuator alignment balances the modulation sensitivity of
the VCO and reference modulation (synthesizer low-frequency port)
lines. It is a method of correcting for deviation sensitivity versus RF
frequency variations in the VCO. The transmit and receive bands are
divided into frequency zones with a calibration point in each zone.
Note: Balanced attenuator alignment is required after controller
board or RF board replacement and servicing.
Using the UP/DOWN arrow keys, adjust compensations according to
instructions provided in your Radio Service Manual. Performing this
procedure automatically calculates compensation alignment.
BBD
MOTOROLA Radio Service Software Use UP/DOWN Arrows To Adjust Softpot.
ASTRO Model:
MAIN:SERVICE:TX ALIGN:BAL ATTN
TRANSMIT DEVIATION BALANCE (COMPENSATION)
-----------------------------------------
Current
Frequency Value New Softpot Value
--------- ------- -----------------
806.0125 31 31
815.0125 32 32
824.9875 32 32
851.0125 41 41
860.0125 45 45
869.9875 47 47
Transmitter..Off
0 63
MIN |----+----+----+---X+----+----+---+----+----+----+----+----| MAX
F1 F2 F3 F4 F5 F6 F7 F8 F9 F10
HELP TOGGLE LOW TOGGLE HIGH PROGRAM EXIT
TONE PTT TONE PTT VALUE
!
Caution
This procedure should be attempted only by qualified
service personnel. Failure to perform alignment
procedures properly may result in seriously degraded
radio or system performance.