Alcatel-Lucent MDR-8000 User Manual page 112

PWR MON
FREQ CONT
XMT PWR
ALM
ON LINE
I CARR NULL
Q CARR NULL
TRANSMITTER
j. Center
carrier
on screen.
XTAL
MON
RF
MON
RF
OUT
Res BW For Nulling Carrier
5-54
You must watch the trace carefully on the spectrum analyzer when adjusting
the I and Q carrier controls on the XMTR module. the I and Q carrier controls
are interactive and the slightest change on one control causes a change on the
other. You must alternate between controls until carrier null is obtained. The
direction to turn the controls is not defined. If for example, the carrier level is
XMT LVL
dropping as you are turning the I CARR control counterclockwise, continue to
ADJ
turn counterclockwise until the carrier level on the trace stops dropping and
then starts to go up. Then turn the Q CARR control counterclockwise or
clockwise until downward movement is seen on the trace and continue to turn
in that direction. Watch for the slightest change in direction and then move to
the other control.
k. Alternately adjust I & Q
Carr Null controls for
minimum carrier amplitude.
Note
Carrier peak at
start of procedure
Dashed lines are used to
show changes in amplitude.
MDR-1211
09/20/05