On Tue, Aug 30, 2022 at 12:59 PM, TE Dukes wrote:
Not seeing my post after changing the range. I'll post the pics again.
That seems to correct the issue.
OK it works at lower frequencies so we know the problem. It is what DiSlord described in his posts. The 5351 Clock chip used in the nanoVNA is only guaranteed to 200 MHz but it usually works up to 300 MHz. Some don't so the maximum frequency threshold is lowered in one of the menu options.
You change it here >> CONFIG->EXPERT SETTING->THRESHOLD
After you change it you do CONFIG->SAVE CONFIG
I suggest you try 280 MHz and then calibrate from 50 kHz to 900 MHz and see if you get the dots in the right place for short, open and load. If that works slowly increase from 280 (recalibrating each time) until it fails again and then back off by 2 or 3 MHz.
Roger
Roger Need