Replay (IQ Transmit)
Re-transmit a recorded capture
What it does
SimpleThis takes a radio recording you made with Capture and sends it back out into the air. Because it actually transmits, it's for playing signals back to your own devices as a learning project.
It's the second half of the record → replay idea, and it's the clearest way to see why very simple (fixed-code) gadgets aren't secure: if a recording of their signal works when played back, the signal never really changed.
How it works
SimpleReplay reads the numbers Capture saved and feeds them back to the transmitter, rebuilding the exact wave that was recorded. If the target device only ever expects that one unchanging signal, it responds — showing why unchanging signals aren't safe.
How to use it, step by step
Simple- Use only a recording of your own device.
- Open the 'Replay' app and pick the saved file.
- Send it out.
- See if your own gadget responds.
Examples
Capture your own fixed-code remote, then replay it to trigger your own device.
Show that replay works on a static-code gadget but fails on a rolling-code one.
Replay a known capture into your own receiver to verify the transmit chain.
Tips & things to try
- Replay reproduces exactly what you captured — quality in, quality out.
- Only replay to devices you own; it's real transmission.
- The 'it still works' result on a fixed-code gadget is the whole security lesson.