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Hi ea3jii and others, Antennas and particularly dipoles on our HF bands are a sum of compromises due to influence of the construction and environment. A pure dipole should have an impedance of

Getting to the ESD question - it's a bipolar part, not CMOS, so there's no delicate gate oxide to punch through. It's physically small, so there's a "energy deposition" issue. There's a 1.5k resistor

Excellent! Loaded it up and I really like the GUI improvements.

Latest is v0.9.1.0 and it is without sdcard mods. The v0.9.1.1 is the same as 0.9.1.0 but with sdcard mods. https://github.com/FreeRepositories/NanoVNA-H4/releases

Nothings about maximum signal input mentioned on NXP site for either SA602AD, or SA612AD. [image: IMG_20200824_135629964.jpg] [image: IMG_20200824_134645191.jpg] [image: IMG_20200824_134411855.jpg]

Thanks afreeangel@. I'm not certain why you posted your reply, but I can only guess that you're hinting that a later version firmware is available. In any case, looking at your link, it seems to apply

https://github.com/FreeRepositories/NanoVNA-H4/releases/tag/0.9.1.1

So - I found my own solution for flashing the firmware using the dfu-util command line interface. FIRST: I replaced the standard driver using the method here:

From the info from NXP, neither the SA602AD or the SA612AD indicate a max. input signal into either port. Max Vcc is 9 Volts though They list TOIP, but not a maximum input signal level, or frequency.

Don’t just highlight this one message. It also had a precedent. see from here: /g/nanovna-users/topic/76003965#16196 -- *** If you are not part of the solution, then you are the

ESD (Electrostatic Discharge) is not the issue. 90-watts into a sub-milliwatt port is the real problem! Likely some silicon was disordered from its engineered ordered state. Dave - W?LEV -- *Dave -

I enjoyed your RARS presentation last month Dan. Thanks for taking the time to put it together and present it. 73, -Rob N4MN

I have apparently tested and exceeded the limit by briefly sending about 90w rf at 50 MHz into the CH0 port of my nanovna-H. --by accident-- I wanted to upgrade to the larger display H4 model anyways.

Arguments and snake oil regarding antennas and transmission lines should not prevail when the hard, cold, correct, engineering practices and hard physics of the situations are considered. These

So many firmwares, so many hardware variations. Can't use this one for my nanoVNA but thanks for the heads-up. -- Brian

I could not get Alibaba order form to understand how a Swedish mobile phone number looks like... so I ordered via AliExpress and payed with PayPal without any problems. Now just wait and see.... /Lars

Hi, I have build my version of the NanoVNA V2, in short it is in a hammond aluminium case with 4" Display and 4000 mAh battery. Currently selling some on tindie:

Point 1) is wrong (if resistance is greater than 50 ohms), Point 2) is correct. Use your nanovna to measure the phase of S11 for a resistor that has a value between perhaps 60 and 100 ohms. Keep the

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ The device sounds fantastic. For me, no screen would be ok as long as there was really good, cross platform, open source software to run on

As Miro has pointed out, tuning an antenna for resonance by looking for a pure resistance in the nanovna display must be done when measuring at the antenna feedpoint. This can be done by attaching