Attila Kinali

Hi Atilla, Read the document below https://www.ngs.noaa.gov/ANTCAL/docs/NGSantcalprocedures.pdf And the reference within         antenna_README.pdf Antennas are generally not calibrated individually by the user. You make sure the antenna you buy are in the ANTCAL or Geo++ lists. Any use of a snow cone should be with one the antenna was measured with. Browse around for your favorite antenna vendor at https://www.ngs.noaa.gov/ANTCAL/ MfG      Björn Sent from my smartphone. -------- Original message --------From: Attila Kinali <attila@kinali.ch> Now I wonder how the calibration data for mass produced geodetic antenna are collected. I very much doubt they put them outside for a couple of days to measure them exactly. Attila Kinali