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A similar discussion in Japanese (use Google translate or similar) http://samy9900.livedoor.blog/archives/5146595.html . His follow-up discussions in January of this year are also an interesting read.

And what is it in the kHz and MHz range ? When I simulate @ DC it is not 50 OHms Jos Op 20-1-2020 om 11:55 schreef erik@...:

A video of this hardware hacking would likely be sobering (but tedious)..

Actually, ST-Link: /g/nanovna-users/message/2447

There are two ways to upgrade the firmware: 1. DfuSe 2. STM-Link which requires an STM-Link v2 dongle You need to use the latter to recover. More descriptions on the wiki or my web page. ha3hz.hu I

He commented that he had the other resistors not available :-D Jos Op 20-1-2020 om 05:02 schreef Andy UA3RAW:

Calculated a somewhat different resistor configuration. Shorted R13 and replaced: R22: 240 ohm R23: 240 ohm R24: 56 ohm R25: 75 ohm The CH1 dynamic range at 1.5GHz is now better than 40dB and the

Ordering info is also linked in /g/nanovna-users/wiki#NanoVNA-H4

Thanks, added to /g/nanovna-users/wiki#NanoVNA-H4

My 2.8" NanoVNA-H v3.4 arrived. I ordered it ($50usd) from hugen's Alibaba store on December 31st 2019 and it arrived January 17, 2020 via parcel post. As luck would have it, the 4" NanoVNA-H4 was

Ok, Erik! Thank you very much! 73!

I was afraid shorting R13 would overdrive CH1 as I did not have the resistors to change the CH1 input (R29-R31) Current CH1 headroom is less than 10dB -- NanoVNA Wiki:

Same as the original nanovna. hugen

I see it. But Erik wrote only about R9, R29, R30, R31 for improving CH0. Maybe he left R13 150 ohm? :-) That's why I asked him.

How fast full sweep and how many sweep points on this variants?

NanoVNA-H rev3.4 is fully compatible with previous versions of NanoVNA firmware. The NanoVNA-H4 uses a Cortex-M4 MCU and a 4-inch LCD, so it is no longer compatible with previous firmware versions.

Hello all, I'm at a loss. I was able to update firmware by going into DFU mode on my nanoVNA, but now that is not working at all since firmware version 0.5.4. The DfuSe Demo (v3.0.6) is not

David, Thank you.? I accidentally posted to the wrong list.? Sorry for the extra bandwidth. Ray -- They say a smart person learns from their mistakes. A wise person learns from the mistakes of

Roger, Have a look at Erik's post from earlier today. Those are the changes that are documented in the latest schematics for hugen's design v3.4 I hope you have a microscope and a steady hand in order

The D2 story is: few nanoVNA were shipped with any D2 installed. 1N4148 was installed by some, Schottky by others. Just as most nanoVNA (except gecko) have type C USB connectors while few have the