# How can I know (check or detect or analyze) which modulation using of my remote control switch?

Please forgive me, my native language is not English.

I'm new to radio, but I have several years of programming experience.

I have a raspberry pi 4 model B (hereinafter referred to as pi), 433Mhz RF Wireless Receiver & Transmitter pair (about the receiver and transmitter details, manual).

I want use the pi and receiver to learn control code (or signals?) of my home remote control switch, then use the pi to control the transmitter to send the learned code (or signals?) to control my switch.

But I learned that wireless modulation has FSK, OOK, ASK, PSK and so on. And I found that the operation mode of receiver & transmitter pair is AM (is it equals to ASK?).

So how can I know (check or detect or analyze) which modulation using of my remote control switch?

Does they all need to match same modulation for communicating?

Forgive me for being a newbie at radio, anything that you think is very basic could be very helpful to me.

• Hello and welcome to ham.stackexchange.com! – rclocher3 Jan 4 at 15:56
• Please confirm, for our understanding. It seems you want to use the pi to replace the remote control. Is it correct? – Brian K1LI Feb 5 at 8:54
• @BrianK1LI Yes. – Joke Huang Feb 5 at 14:18
• Please edit your question to add links to the user manuals for the TX and the RX modules. – Brian K1LI Feb 5 at 17:29