What is a maximum length of 50 ohm coaxial cable that can define the calibration plane?
I would like to use SOL at the end of a 100 foot length of 50 ohm coaxial cable to define the calibration plane. This is so I can measure at a remote distance the effective S11 parameter of an antenna. Is there a limit as to how long the cable can be? What issues should I be aware of regarding calibration accuracy, repeatability?
Regards,
Karin
I think the maximum attenuation that can be tollerated is around 15 dB.If the attenuation of the cable is very high, then you will not get a decent calibration.
I think the biggest issue will be the phase stability of the cable. What frequency is this? If the cable is many wavelengths long, then the slightest change in temperature will cause amplitude and phase shifts. If the cable is only a fraction of a wavelenght, then this will not be a major issue.