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Nick, I have a "beautiful" Flat Screen Sony, it was a Christmas gift from a dear lady friend. Back when LCD flat Screen Monttors were $250+. I was living in New England and left there 14 years ago. It

Sorry, I think I got it wrong. Then the ST-Link v2 dongle remains.

If you don't recognize it, you can use USBDeview Utility to see what's preventing it. If your mouse and keyboard are both usb, do not delete it! Delete and reinstall the troublesome or unnecessary

Its chinese new year now. The whole of China is on holiday Try next week -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK

Hi Dennis, To date, I've only upgraded the firmware once with the ST-Link dongle because it was in my account for a different reason. I had no problem with that, otherwise someone would recommend it

I would like to purchase one using paypal..as others have done..sent two emails to Maggie king with no response ?

Thank you both for the information! I think my issue may be a bit different (maybe) because I am able to enter DFU mode on the nanoVNA, it's just that the DfuSe Demo software no longer recognizes the

I checked the content of this blog and some of the issues mentioned come from the wrong shield of the bad clone. Some modifications may not apply to a good NanoVNA. Our manufactured NanoVNA-H has good

This may be a stupid remark but: The DFU "Upload" is for making a backup of your nanoVNA flash memory to you PC Use the "Choose" and "Upgrade" keys to update the firmware -- NanoVNA Wiki:

Hi Guyla, I'm sure it's connecting with the pc, it works with vnasaver, and when placed in dfu mode, shows up correctly in usb devices, also the upgrade software shows complete success. Dennis G8IMN

I measured the resistors and the 56 ohm resistor is actually 55 ohm -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK

That is abt the Tx output inpedance not the RX Jos Op 20-1-2020 om 14:24 schreef hwalker:

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