RF Receiver for 433mhz and 315mhz?

Question

I have a XD-RF-5V receiver wired to my Raspberry Pi listening with RFSniffer (433Utils). I also have a XD-FST 433.92mhz transmitter wired to my Raspberry Pi running codesend (433Utils).

I can successfully transmit and receive between these two devices.

$ sudo ./codesend 500000
sending code[500000]

$ sudo ./RFSniffer
Received 500000
Received 500000
Received 500000

I also have a 12v 4 channel relay that has a built in RF receiver and came with a remote transmitter. The paper than came with this relay kit says it is operating at 315mhz.

I want to sniff the codes from the remote for this relay kit. Whenever I try to run RFSniffer (433Utils) with the remote, it doesn't pick up anything.

On the back of the XD-RF-5V receiver it says 433mhz, 330mhz, and 315mhz so I would assume it can receive 315mhz signals.

Am I doing something wrong or making incorrect assumptions? Is there something I need to do differently to receive the 315mhz signal? Can this receiver even receive both 433mhz and 315mhz signals (like it says on the back)? I am a bit new to RF (and electrical hardware in general) so I am not really sure how these different frequency devices play together.

Answer 1

The receiver you have can only receive 433 mhz signals. See the white dot to the right of "433MHZ"? That indicates that it is already tuned to 433MHz.

The manufacturer uses the same PCB for each version then indicates which frequency it is tuned to.

You need a receiver for each frequency you wish to receive.

Answer 2

The receiver will only be able to receive one of those frequencies at a time. You will need to tune it to the appropriate frequency using the adjustable core on the inductor.