Calibrating frequency of Airspy HF+ Dual Port/Discovery and Airspy R2/Mini

airspy-r2-hf-calibration.md

Calibrating frequency of Airspy HF+ (Dual Port / Discovery) and Airspy (R2 / Mini)

Requirement

• Windows 7, 8, 10

Airspy HF+ (Dual Port / Discovery)

• Get the hfplus_ppb.exe in the Firmware distribution kit available at the end of this web page
• Open the command console (run cmd.exe (via PowerShell if needed))
• You can retrieve the currently memorized offset value by hfplus_ppb.exe without the argument
• Set the frequency offset value from (presumably) -2500 to 2500 as hfplus_ppb.exe 1000
• Roughly estimated offset: 12.2Hz/10MHz (1.22ppm) for the full range of the frequency offset value (-2500? to 2500)
• Note well: upgrading the firmware resets the offset value -- The flash.bat provided explicitly saves the value before the upgrade and restores it after the upgrading ends

Airspy R2/Mini

• Run the AirspyCalibrate.exe in the Windows SDR Software Package available here
• Provide the accurate frequency signal (preferably the output of the GPSDO) to the Airspy input and set the frequency value to AirspyCalibrate.exe
• See the Calibration section of Airspy Quick Start page for the further details