On 8/15/21 12:37 PM, Roger Need via groups.io wrote:
On Sat, Aug 14, 2021 at 09:14 AM, David Feldman wrote:
If I insert (example) 6 dB pad between nanovna S11 port and amplifier input
port, and calibrate the nanovna (open-short-load) at the "far" end of the pad,
what impact would this have on S11 measurements?
Here are some S11 measurements I did "calibrating out" a 10 dB and a 20 db attenuator. Measurement errors get worse as you increase the attenuation but 6 dB won't be bad at all.
/g/nanovna-users/message/18145
Roger
What's the ripple in the measurement from? A reduced SNR would give a random error, not a periodic one, but maybe it's a manifestation of a phase bias that is contributing more or less depending on the reflected phase?
