In the documentation for the CC1101 RF radio chip it is advised :
In order to ensure reliable operation, CC1101 includes
frequency synthesizer self-calibration circuitry.
This calibration should be done regularly, and
must be performed after turning on power and
before using a new frequency (or channel).
Currently I have the chip doing AUTOCAL avery time it comes out of IDLE mode into RX or TX mode. This is set-up using then MCSM0 register.
My question relates to the frequency of autocalibration that needs to be done, that is, how often really ? Is it necessary to do the calibration every time the chip transmits or receives ?? What is "should be done regularly" in milliseconds/seconds ??There is no advice in the documentation on how often it is required, other than what is stated in the above paragraph.
I do a calibration after turning on power, but I always use the same frequency of transmission and reception once the frequency is set-up at the start.
This self-PLL-calibration does take some time, and I'd rather not do it unless it is really required.