Radar Field Analyser - RFA641 Edition Date: 28-Feb-18
provides power to the LRU499. The BNC connector on the breakout box contains the modules video
output and needs to be connected to the analogue video input of the RFA641.
First a limited modulator sweep is performed to allow the program to set the power level to +10dBm.
The log RF unit allows viewing the transmitted RF pulse and the received power level at the LRU499
RF input (using the LRU499 calibration file). The pulse shape is displayed in the LRU Input Power
graph, together with its average power level. This way, the Tx modulator calibration process can be
viewed.
3. Insert the YIG filter in the RF connections, as explained in the related dialog box that pops up.
4. Once the connections are made, click the OK button. Now the YIG insertion loss is measured and
the result is indicated in the YIG Filter section. An error is indicated in case the loss is higher than
8dB.
5. Then the YIG filter attenuation versus frequency is measured. This is done in a frequency span from
50 MHz below to 50 MHz above the selected selftest frequency.
During the frequency sweep, a progress bar indicates the progress and also the pulse amplitude can
be viewed in the LRU Input Power graph.
Once the YIG Filter sweep is completed, the program continues with the Tx modulator calibration.
The frequency is reset to the selected selftest frequency and the modulator voltage is swept from
maximum to minimum. The LRU499 measures the RF power generated and this way the output
power is calibrated.
The measurement is performed in two steps:
• First the power is swept from maximum to minimum until the LRU499 noise level is hit.
• Then the program will ask you to remove the 20dB attenuator at the Tx connector. Again the
modulator voltage is swept from max. to min. while the corresponding power level is measured.
The resulting maximum and minimum power are indicated in the Output Power section. The slider
allows you to set the output power (i.e. in case you want to check the power level with a spectrum
analyser). An error is indicated in case the max. output power is below the specified minimum and in
case the dynamic range is not sufficient (<60 dB for the frequency range 800...1500 MHz, <50 dB for
frequencies above 1500MHz). When the modulator sweep is done, the selftest sequence is ended.
3. When the selftest sequence has ended, it is possible to view the YIG filter attenuation vs. frequency
by clicking the View Filter button as explained in section 2.2.2. above.
4. Click the Return button to stop the Selftest function or to return to the calling function.
When the RFA Self-Test/Calibration procedure is performed without problems, you can continue with the
measurements, knowing the RFA641 is performing as expected.
2.3. Troubleshooting
In case the RFA641 cannot be found, an error message will appear: verify whether the Radar Field Analyser
is powered up and properly connected.
IE-UM-00165-005 RFA641 User Manual.odt 20/110
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