Radar Field Analyser - RFA641 Edition Date: 28-Feb-18
8. RFA TRANSPONDER INTERROGATOR
8.1. Theory
The Radar Field Analyser RFA641 is used together with the necessary test software to send out
interrogations. The output interrogation power level of the RFA641 is limited to 17 dBm (50 mW) minus 10 dB
attenuation of the external attenuators. Therefore the real interrogation power send by the device is 7 dBm
(5mW). The air link with the transponder will attenuate ± 60 dBm, bringing the power at the input of the
transponder at ± -53 dBm, which is comparable with radar operation. In case you want to connect the
transponder directly just replace the air link by 60dB of attenuation capable of handling 250W peak power.
8.2. Getting Started
The RFA Transponder Interrogator is loaded from the RASS-S Toolbox using the Transponder
button.
Make the connections as shown in Annex 10: RFA Transponder Interrogator Connection Diagram.
8.3. Software
The transponder test software consists of two tools. The RFA Transponder Interrogator allows to construct
an interrogation sequence (schedule) and save it to disk for later use and analysis. The interrogation
schedule can be played, and simultaneously the transponder reply video is sampled and stored to disk.
The View Transponder Test Data program allows to visualise the transponder replies against the sent
interrogations.
8.3.1. RFA Transponder Interrogator
1. The Power control allows to set the Tx Power for the interrogations. The control directly changes the
Tx output Power. The Tx Power is not set by the interrogation schedule itself.
IE-UM-00165-005 RFA641 User Manual.odt 77/110
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