Good day,

I received the unit this week and so far the out of box experience has been positive. A ham colleague who has built several other VNA's as well as he and I used big box VNA's are quite surprised by its capability.

The unit arrived with battery, still holding charge as it ran out of the box for about 45 minutes. Run time after full charge, about 2.5 to 3 hours. I suspect I have a 375 mA/hr battery in the unit.

There PC software connects easily to the nanoVNA - 2 track or S11 and provides real time measurements. I constructed a simple impedance match network and easily adjusted while monitoring the pc screen. The cal routine is a bit convoluted. So take care there! I measured there standards on the 8753 after I did a SOLT cal with my hp 3.5 mm standards. And to make a long story short, I believe there top frequency 900 MHz return loss quality is limited to about 18 dB. At VHF and below, 35 to 40 dB is easily met. So as an HF AA, quite excellent.

I would like to know if the firmware actually incorporates the SOL standards as defined polynomial coefficients or did they set the SOL standards as IDEAL. I would be happy to the extent I can, answer or discuss topics on this unit. Alan W4AMV