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Why do you need Tx for an IMSI catcher? Also, a USB TV tuner won’t work for the receiving side either. You’ll need to step up into an actual proper SDR for that
by jsjohnst 9y ago
Why do you need Tx for an IMSI catcher? Also, a USB TV tuner won’t work for the receiving side either. You’ll need to step up into an actual proper SDR for that. Still easily sub $500, but sub $100 is a bit too far a stretch.
- gsich 9y agoEasier if your target phone connects to you.
- bigiain 9y agoA $12 RTL-SDR USB stick will 100% work for most GSM rx (won't hit the 1900+MHz bands without a downconverter, but that's why you want tx - you'll use it to force the phone onto the 800-900MHz bands anyway, the top half of the 915MHz ISM band in the US if you have a HAM licence and are trying to not break _too_ many laws at once). This DefCon talk: https://www.youtube.com/watch?v=fQSu9cBaojc https://www.youtube.com/watch?v=fQSu9cBaojc Gives a good overview of why you need tx to capture an IMSI - without forcing a handset into transmitting non-encrypted, you only get the TMSI (unless you can crack the crypto - and why bother, when a base station can instruct a handset to just not encrypt anything?)