Description
This video is about the General Radio (GR or GenRad) air lines and how to use them to calibrate or check calibration of NanoVNA devices. They come in different lengths but center primarily on 30 cm for 1 GHz and 1 nS time calibration standards. These air dielectric coaxial lines of precise length allow us to have very accurate standards that are not subject to changes in dielectric constants that we would find in coaxial cable with solid dielectric or male/female connectors with different time constants.
Out of curiosity, some of you might want to know where the dimensions are measured on the air line - the 20 cm is measure from the end (tip) of the inner conductor from one end to the other.