On Mon, Jul 10, 2023 at 06:38 AM, Ma?l H?rz wrote:
What is the latest hardware version of the NanoVNA-H4? And is there a
(minor) update planned, such as protection diodes, or something similar?
The latest version of the -H4 that I am aware of is version 4.3 which was released about 18 months ago by Hugen. It is a mature product and there probably won't be any more updates unless some parts become unavailable and he needs to do a circuit change. He did put a better 4" IPS display in the tinySA Ultra so maybe he is now using that in the current production runs of the -H4. .
A NanoVNA-H4 running "Auto" mode outputs 0.8 dBm at 30 MHz. so this precludes using any "protection diodes" on the front end. But the input impedance is 50 ohms and there have not been any reports of ESD damage that I have read in this group. That said users should exercise caution when handling the device, short antenna terminals before connecting them and not transmit when the NanoVNA is measuring a nearby antenna.
Roger
Roger Need