Meteorcomm LLC 63020 ユーザーズマニュアル
ITCR Locomotive Radio User Guide
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4/30/2013
dsp_mode,test
l1_test,stop
l1_test,set,txmod,dqpsk
l1_test,start,tx
l1_test,set,txmod,dqpsk
l1_test,start,tx
2. View the calibration settings by typing:
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.
cal,set,igain,xxxx
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. Do not set peak envelope power greater than 50W.
5.5 Check and Adjust RF Output Channel
You can adjust the RF output channel by stopping transmission, setting transmission
frequency, and then starting transmission again.
frequency, and then starting transmission again.
To adjust RF output channel:
1. Tune the radio to the bottom channel (220.0125MHz) by typing:
1. Tune the radio to the bottom channel (220.0125MHz) by typing:
l1_test,stop
l1_test,set,txfreq,220012500
l1_test,start,tx
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
l1_test,set,txfreq,221012500
l1_test,start,tx
3. Tune the radio to the high channel (221.9875MHz) by typing:
l1_test,stop
l1_test,set,txfreq,221987500
l1_test,start,tx
l1_test,set,txfreq,221987500
l1_test,start,tx