How To Replay RF Signals Using SDR

This report is a hands-on tutorial demonstrating RF signal capture and replay of a 433 MHz wireless doorbell using SDR hardware (RTL-SDR, HackRF One, Yardstick One) and tools (Gqrx, GNU Radio, RfCat/Audacity). It walks through identifying the signal, decoding OOK/PWM patterns, constructing binary/hex bitstreams, estimating baud rate, and transmitting with RfCat, including troubleshooting differences in pulse timing and providing a Python 2.7 script for automation; it is instructional rather than an account of a cyber incident.