Quick introduction to Secondary Surveillance Radar and how it works. After explaining the absolute basics, I am showing how one can simulate transponder responses using off-the-shelf test equipment. RTL1090 is used to verify the generated signals as valid.
If you want the arb waveform file for the 7777 Mode A response, here it is:
https://baltic-lab.com/wp-content/uploads/2015/12/SQUAWK_7777_IDENT.zip
Please cite this article as:Westerhold, S. (2015), "Secondary Surveillance Radar | An Introduction". Baltic Lab High Frequency Projects Blog. ISSN (Online): 2751-8140., https://baltic-lab.com/2015/12/secondary-surveillance-radar-an-introduction/, (accessed: May 21, 2025).
Sebastian is a self-taught independent researcher and tech influencer with a passion for radio frequency (RF) and digital signal processing (DSP). He's been active as a blogger, YouTuber and author for Elektor Magazine for over a decade.
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