Can two 315MHz RF modules communicate with each other if none of their frequencies are exactly 315MHz?

Question

I bought two RF modules that were made by different manufacturers. They were both labeled 315MHz on the manufacturers' websites. However, when I tested their frequencies with SDR#, I saw that even though they both fell into the 315MHz range, their frequencies aren't exactly the same.

Will the two RF modules be able to communicate with each other?

Please kindly refer to the screenshot below for the tested frequencies:

Answer 1

It is difficult to give a specific answer based on the limited information supplied. Here are some general considerations:

1. Most receivers will have a tolerance for locking onto a transmitter's frequency. The specific tolerance is fully dependent on the design that has been implemented by the manufacturer. But consider that even with modules supplied by the same manufacturer, there will be a tolerance associated with the transmit frequency for which the receiver must adjust accordingly.
2. There is more to consider than simply frequency tolerance when mixing modules from different manufacturers. The modulation mode, the modulation index, the encoding methods, etc. must be matched between the receiver and the transmitter. For example, if the transmitter is sending with amplitude modulation (AM) and the receiver is decoding signals using frequency modulation (FM), even if they are on the same frequency, the two will not be compatible.