Frequency Offset

[RavinMaddHatter]

I am not sure what is causing this on my unit, however it is repeatable. I have access to a keysight E5063 as well as a few other VNAs that are factory recalibrated. When measuring the corners of a filter and other similar items on my NanoVNA i see a 25 MHz offset.

Looking at the Fixed frequency mode (CW) the frequency is spot on. (but has lots of spurs)

I am happy to test a different firmware load or other items if it helps improve the product. I can offload plots or other things if desired.

Generally happy with the device, i am concerned there is an unintended bin offset in the firmware and the X value for the data is off by X bins when plotting,

I am happy to take data for this, i will be away from the equipment for the next 2 weeks, but if we could plan what testing would be helpful before i go in to test the device