Hello,
I SOL calibrated my NanoVNA using a 30cm cable + F to F SMA coupler and the SOL end pieces. I removed the coupler and attached the 30cm cable to a ~5cm 50 ohm coax cable soldered to the input of a matching network which goes to a 900MHz Igneon PCB antenna. When using the tip of a knife to short the soldered-on end of the coax cable I need to use -205ps offset delay to bring the majority of the points to the left edge of the Smith Chart. Positive values make the plot worse. Is it ok to use a negative number with the NanoVNA Saver? That seems counter intuitive.
