User's Manual

ITCR Wayside User’s Manual
© 2013 Meteorcomm LLC. All Rights Reserved. Proprietary and Confidential
10 5/16/2013
3. Apply power to the radio. Wait 30 seconds to open an XtermW session. Use
the Edit/Configure Port window to set Port Type = TCP/IP, Protocol = Stream,
TCP/IP Settings Host = 10.10.1.254, Port 4000. Select Device Type = MCC 6100
SDR (which also applies to ITC radios). Return Character = CR, Data Format =
ASCII.
4. Attach a 50W 30 dB RF attenuator to the TX/RX1 N-type antenna connector.
Attach an (e.g., Agilent MXA or PXA) vector spectrum analyzer or similar to the
transmitter port for power and frequency measurements. The VSA should
contain either a precision stability reference oscillator or attach an external
rubidium reference to the VSA external reference input.
5.3 Measure and Calibrate Reference Crystal Oscillator Frequency
The instructions below allow you to change the factory calibration settings for the
master reference oscillator crystal.
To check the master reference crystal oscillator frequency calibration:
1. Open an XtermW session.
2. Put the radio into test mode by typing:
dsp,watchdog,off
dsp_mode,test
3. Reduce output power to approximately 2W by typing:
cal,set,ddslevel, 100
4. Begin transmitting a test tone directly on the carrier frequency:
l1_test,stop
l1_test,set,txmod,cw
l1_test,set,txfreq,220012500
l1_test,start,tx
5. Use the frequency counter or frequency counting marker on the VSA to
measure the output frequency. The measured value is the actual carrier
frequency. The carrier frequency is normally well within 352 Hz (1.5 ppm) of the
center frequency of the channel.
6. Alternate to the test tone: Substitute the following π/4-DQPSK modulation
command for the second line in step 4.
l1_test,set,txmod,dqpsk_half