Radar Field Analyser - RFA641 Edition Date: 28-Feb-18
10. Only the part of the curve selected with the cursors on the Log Rec Calibration graph is saved to
disk. Therefore first select the portion of the receiver curve you want to save and click the Logging
button. The VI will prompt a standard file dialog. Fill in the desired calibration file name and
save the calibration data on disk.
4.1.4. Troubleshooting
1. A “File not found” message pops up the minute you run the instrument
◦ Check whether the RFA641 calibration files are installed correctly.
2. The Calibration Pulse graph turns red and a beep is produced
◦ Set the cursors of the Calibration Pulse graph onto the pulse.
4.2. Rx Bandwidth Measurement
4.2.1. Theory
The Rx Bandwidth measurement consists of a frequency sweep. This frequency sweep can be performed
with a fixed level (static) or with a variable amplitude pulse (dynamic). This selection can be set by the user.
The RFA641 transmitter is set to transmit a pulse at the specified power value and the frequency is swept
between two chosen limits. Additionally it is advisable to perform a full bandwidth sweep (900MHz -
3.0/3.5GHz) to check on band spuriousness. The RFA641 continuously samples the output of the radar
receiver video signal and uses these values to build a dBm versus frequency table. The resulting bandwidth
graph can be analysed to determine the 3dB and 10dB bandwidths of the receiver.
4.2.2. Getting Started
The Rx Bandwidth is loaded from the RASS-S Toolbox using the Rx button.
Make the connections as shown in Annex 3: Rx, Bandwidth and STC Calibration Connection Diagram.
IE-UM-00165-005 RFA641 User Manual.odt 46/110
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