Dear Nordic support,
I am trying to calculate the maximum duty-cycle for the FCC certification.
To do so, I started by finding the ratio between the time the TX is On during each Link Layer packet transmission and reception. I am calculating the TX time by computing the time to transmit the 265 bytes of a packet with the LE Data Packet Length Extension, which is 265 bytes*8/1Mbps = 2120 us. The time per LL packet includes this, plus the IFS, the ACK and next IFS, yielding a total 2500us.
This yields a theoretical maximum duty-cycle of 84.80% (2120/2500), without taking into consideration any connection interval value nor packets fully fitting on the connection interval. According to this thread, the value is actually 86.40%, due to 40us on the IFS to prepare the TX radio. Can you confirm that?
However, after further investigation with the Online Power Profiler, one can see that, during a connection interval, there's at least 2012 us before and after the communication occurs where the antenna is not in TX, RX or waiting during the IFS.
My question is: is this overhead present in all connection intervals, effectively lowering the maximum Radio Duty-cycle possible?
All the best,
Pedro
