Hi Surendra,
Can you please refer these Application notes for (APS023)IC Calibration and (APS014)Antenna Delay Calibration @
https://www.decawave.com/application-notes/ ?
These App notes will give more info on IC Calibration and Antenna Delay Calibration.
The user has to configure the Tx power settings at register 1E for maximum range.
In TREK software by default , The Tx power settings is configured for maximum range for about 300m
Thanks & Regards,
Deepa