"You can see this effect by putting a flush short-circuit on as a device and looking for phase (especially at higher frequencies). quote]And, it depends even on your definiion of "flush". Below 6 GHz, the cal kits assume the shore is "flush" (actually, they assume it's length is the lenght of the coax that goes up to it) and igores inductive effectds. The same standard, used in a high frequency cal kit, such as used with the 8510, has an inductance value for the short that takes into account the length from the inner to outer conductor. Interestingly, in the good old days, the same cal kit standard was placed into different cal kits, based on the instrument intended (8510 or 8753). The 8753 definitions gave better results below 6 GHZ than the 8510 ones did, as the polynomials were tuned for 6 GHZ operation, but fell apart badly above 6GHz.
"In general, the reference plane is where the outer conductors of the coaixal connectors meet."
"Not necessarily, especially with something like Type-N that has recessed test ports."
"Yes of course, you are right. I suppose what I was thinking (but not saying ) was that you need to be careful that you are clear where the outer conductors meet.And on the Type-N it is recessed to the inner shoulder."
Retrieving data ...