RF module can communicate when the frequency difference is 4MHz

RE: RF module can communicate when the frequency difference is 4MHz

run_ar — Wed, 13 Jun 2018 11:13:28 GMT

It is not bidirectional because of the way frequencies are mixed in the radio (or something like that). I assume the difference is there because the signal will be very low on the receiver side. So small changes to distance and some production variation would make some devices better at blocking this frequency.

RE: RF module can communicate when the frequency difference is 4MHz

harryAI — Tue, 12 Jun 2018 13:51:25 GMT

One more question. If this is expected behavior, why it is not bi-directional? In addition, in our test, if we test several different RF modules, some RF modules can communicate when the frequency difference is 4 MHz, but some cannot not. Why does it have such difference.

RE: RF module can communicate when the frequency difference is 4MHz

run_ar — Tue, 12 Jun 2018 06:43:28 GMT

This is expected behavior for the L01+. And happens because of the way the radio is designed. Please note that the received signal strength is much lower in this case, than when both tx and rx is transmitting on the same channel.