On 15/10/21 1:55 am, Gregg Messenger wrote:
It is easy to come to the conclusion that the S11 phase angle as seen on the nanoVNA (CH0 PHASE 90..) is the relationship in a device under test between the voltage and current in that device, and I once fell down that hole myself.
I'd suggest that although use of the NanoVNA should not be limited to those with engineering degrees, it would be helpful for most beginners to at least understand what the S11 and S21 parameters refer to. It seems that many new users have never even heard of scattering parameters, let alone understand what they are about. As usual, Wikipedia has a good high-level article <> on this.
Anyone using a VNA ¡ª Nano or otherwise ¡ª would benefit from having read and understood about the first third of that article and perhaps at least skimmed the rest. Trying to use a VNA without understanding this would be a little like trying to drive a car without understanding what speed was, let alone what a speedometer does. It's possible to proceed without this knowledge, sure, but doing so makes life needlessly difficult.
- Roland 9V1RT
