Osmo-fl2k: VGA dongles as transmit-only SDR(osmocom.org)
osmocom.org
Osmo-fl2k: VGA dongles as transmit-only SDR
https://osmocom.org/projects/osmo-fl2k/wiki/Wiki
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So one of these for tx and a usb tv tuner for rx, a Raspberry Pi running OpenBTS, and you've got yourself a sub $100 IMSI catcher...