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Why specify Delay in TRL?

Question asked by mideoguns on Jul 22, 2008
Latest reply on Jul 27, 2008 by daveb
Hi, I've just been reading the famous ENGEN paper on TRL calibration and was wondering why I need to specify the line delay at the GM of my frequency band in my Cal Kit when the TRL calibration itself inherently determines this delay and I already know the physical length of the line? I am using dispersive transmission lines on an 8510. Sorry if the question sounds stupid but I have not been able to get my head round it so a most basic explanation will be welcome.