Hello,
Try setting the THRESHOLD setting to 280 and do another complete calibration.
Some clock chips are not stable at the default value of 300(MHz). These chips are severely overclocked in the NanoVNA design, their nominal Fmax is 200MHz.
The instability shows up as "noise" in many traces.
This will reduce your "maximum" frequency to 1400MHz using the 5th harmonic, but most manufacturers state a useful maximum up to about 1250MHz anyway.
Make sure you do a RESET and CLEAR ALL to clear all old Calibration data before you do the new cal.
HTH.
73...Bob VK2ZRE
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On 6/05/2022 3:03 am, kosmos wrote:
This is when I calibrated and left the cable in through, used the thin coax that comes with it.
