In the receiver code I posted in post #6 only a code of 1101 works.
In the receiver code I posted in post #7 1100, 0101, 0100 works but not 1101. In all these cases the forward link (434 MHz) works all the time (in the cases where the first two bits (address) are different I changed the two bits (B0, B1) that are hardcoded in the code so that everything will work) but the reverse link (315 MHz) works only for the combinations I specified above.
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