SWR / Power meter calibration process
See also:
Do a calibration
Calbration summary
TrxAVR-Picastar Power/SWR meter overview
TrxAVR-Picastar, on transmit,
has a power meter whcih displays forward and reflected
power and SWR.
Hobcat has a calibration facility for this power meter. This works via USB
link.
Calibration profiles are stored in the PC and loaded via USB the TrxAVR-Picastar.
The TRxAVR board has
two analog inputs, AD0 and AD1 which are dedicated to reflected and forward
levels
from anSWR meter.
The SWR meter can be a design of your choice (and could be external).
Two homebrew options are:
Power meter calibration - Hobcat
Hobcat has separate forward and reflected power calibration windows / processes.
Note that TrxAVR-Picastar
must be running (after its DSP load) and conencted by USB,
otherwise a 4-second timeout message appears and then the window closes.
Loading a calibration file
Note that PicAStar's 8.1
Tx drive level increments which are in 1dB steps and so this
determines the power levels of the calibration points.