edy555 released a screenshot that appears to be his prototype NanoVNA-2 operating to 4.2 GHz (see attachment). No other details were provided. The s21 noise floor in the attached photo indicates that harmonics are used for frequencies above 300 MHz, so I don't expect the kind of performance improvements delivered by the S-A-A-2.
With limited 4 GHz operation and a 4" display, the edy555 NanoVNA-2 would mainly compete with the NanoVNA-H4 and NanoVNA-F. With a 2.8" display, it would compete with the popular NanoVNA-H v3.4.
The edy555 NanoVNA2 still uses a 2.8" display, with harmonics above 700MHz. Use ADC arrays to speed up scanning. At the moment it seems that the noise is still relatively high and the manufacturing costs are too high.
hugen, Thanks for the additional information. Do you know what generator chip is used for 700 MHz fundamental operation? I agree the noise is higher than I expected for a second generation design, but its a prototype and I assume edy555 is still working on performance issues. I have no idea what the BOM is, so I can't comment on the manufacturing costs.
.. 4.2 GHz is uint32 limit .. =========================================== Dislord, That is correct. edy555 commented that he ran into the Uint32_t limit with the screen shot he provided.
