Pondering a simple question relating to SMA calibration devices as in those that are generally supplied with a?newly purchased Nano VNA as an example. Open is Open, that is obvious. The connector simply shields the?the female connector from any outside interference during calibration. The short is obvious as well, 0 (Zero Ohms)?resistive load. But, more to the point, my biggest concern is with the supposedly 50 Ohm resistive calibration?load. I have 3 such devices from various sources, and none are precisely 50 Ohms. My most recent purchase?has a calibration sticker enclosed in the kit indicating the 50 ohm load is 48.9 ohms. I confirmed that value with?my DVM. Would that be considered adequate, or good enough. How significant does that difference in the ohmic?resistance become in the final sweep product. Of course assuming I am calibrating the VNA at the end of the?feed line just before the actual antenna.
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On Thursday, August 4, 2022 at 09:36:02 PM EDT, Donald S Brant Jr <dsbrantjr@...> wrote:
I got my cal kit from Dr. David Kirkby kirkbymicrowave.co.uk.? It includes not only extensive characterization data but also optionally verification standards which will allow you to check the quality of your calibrations.
73, Don N2VGU
