On Sat, Sep 17, 2022 at 11:27 AM, John Gord wrote:
The latest DisLord firmware for the NanoVNA does allow you to see what the
filter response would be with a load impedance different than 50 ohms.
I respectfully disagree with you. The Port Z feature in the latest DiSlord software only does the mathematical calculations necessary to convert the measurements to a different system impedance (like 600 ohms instead of 50)
It does NOT change the actual load impedance on the filter itself. The filter characteristics will change if you do not use the actual source and load impedance that the filter was designed for. For example take an IF filter that was designed for a 1000 ohm in/out impedance. If you put 50 ohms on the output the rolloff characteristics will be much worse than at 1000 ohms and no mathematical calculations in the NanoVNA will compensate for that.
Roger
Roger Need