ITCR Base Radio User's Guide
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9/8/2011
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11
To measure and adjust output power:
1.
At the XtermW command line, begin transmitting a π/4-DQPSK signal by typing:
i.
dsp,watchdog,off
ii.
dsp_mode,test
iii.
l1_test,stop
l1_test,set,txmod,dqpsk
l1_test,start,tx
2.
View the calibration settings by typing:
i.
cal
3.
Note the values for igain and qgain. They are normally matched.
4.
Increase the output level by entering larger matched values or reduce output
level using smaller matched values. Use cal command in between to verify the
new settings.
i.
cal,set,igain,xxxx
ii.
cal,set,qgain,xxxx
5.
Tune the VSA to the center of the channel frequency and use the CCDF function
to measure the peak envelope power, average power and peak to average ratio.
4.5
Check and Adjust RF Output Channel
You can adjust the RF output channel by stopping transmission, setting transmission
frequency, and then starting transmission again.
To adjust RF output channel:
1.
Tune the radio to the bottom channel (220.0125MHz) by typing:
l1_test,stop
l1_test,set,txfreq,220012500
l1_test,start,tx
2.
Tune the radio to the mid-channel (221.0125MHz) by typing:
l1_test,stop,
l1_test,set,txfreq,221012500
l1_test,start,tx
3.
Tune the radio to the high channel (221.9875MHz) by typing:
