RF905 monitoring carrier detect during the receiving of a package.

[Gerrit Jan Grievink]

Hello We have devices who uses nRF905 for transmissions between them. When we receive messages we use the AM and DR signal to determine if a message is read correctly. The AM rising is used to detect the reading of the global address and the combination of AM an DR is used to detect if the CRC of the package is correct. My question is, is it useful to monitor the carrier detect (CD) during receiving of a package. Will monitoring CD and rejecting the package when the CD toggles, contribute to a more reliable package receiving than just using the AM and DR signal? Thanks.

[Jon Gunnar]

Hi,

It is sufficient to monitor the DR signal in order to detect when a valid packet has been received. DR will only go high if a packet with the correct address and CRC has been received. You will not achieve a more reliable packet reception by monitoring the AM and CD signal in addition. The AM signal is nice to have to get an early warning of a packet reception. The CD signal is nice to have in "listen before transmit" scenarios.