On 2/6/23 2:45 PM, Brian Beezley wrote:
On Mon, Feb 6, 2023 at 02:38 PM, Jim Lux wrote:
Or are you calibrating with the load, and then remeasuring it and getting a
different answer?
Yes. N6LF calibrated with a 25-ohm load and then immediately measured it. That's why I don't understand the result. The resistance offset looks like a numerical bias issue. I don't know what to make of the LF reactance rise.
Brian
That is weird. The reflection coefficient (raw) is going to be (50-25)/(50+25) or 0.333 That's not getting anywhere near the noise floor.
It would be interesting to see what he gets if he calibrates with 50 ohms and measures 25. Is there the same frequency dependent variation?
