开云体育

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 keeps playing. It is 4:3 screen format.. I use it with a 4 port KVM in the hamshack. (Win Server, Win 7, Linux Mint, Win 10)
The calibration box on Win 7 on that 4:3 screen does exceed the screen size, but I can "drag" it around. at pop-up 75% is visable, So I'm ahead of you, as far as my GUI... My graphs are not perfectly formatted to my screen, perhaps better looking on a widescreen.

I hope the author places this on his "Honey do list" but More important is the "real" nuts and bolts of VNA that we so appreciate of the program to date.. I can click and drag just fine..

I also appreciate multi platform versions the author is working with.. goes beyond my pay grade indeed.

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

On Mon, Jan 20, 2020 at 04:07 PM, <brianbgarber@...> wrote:

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 device once in that mode. Also, I
can connect via the STM32CubeProgrammer program over USB (see attached png).
Thankfully my nano isn't bricked, but I can't seem to update it over DfuSe
Demo.

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 driver.
I hope this is the solution.

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 if DfuSE fails the upgrade.
You can also find a detailed description in the wiki or on my site (ha3hz.hu).
Hope I was able to help with upgrades.

73, Gyula HA3HZ

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 device once in that mode. Also, I can connect via the STM32CubeProgrammer program over USB (see attached png). Thankfully my nano isn't bricked, but I can't seem to update it over DfuSe Demo.

On Mon, Jan 20, 2020 at 09:24 PM, hwalker wrote:

A similar discussion in Japanese (use Google translate or similar)
. His follow-up
discussions in January of this year are also an interesting read.

- Herb

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 isolation.If you have better suggestions for improvements that can be feedback on github, we will try it and apply it to the next version of NanoVNA-H after verification, and send you the improved version to verify the modified effect.

hugen

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: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

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

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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) . His follow-up discussions in January of this year are also an interesting read.

- Herb

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@...:

Do NOT be tempted

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

1. DfuSe
2. STM-Link which requires an STM-Link v2 dongle

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

On Mon, Jan 20, 2020 at 03:24 AM, <brianbgarber@...> wrote:

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 recognizing the nanoVNA"c when I enter
DFU mode either via "Config", "Reset and Enter DFU" or by putting the short
across the pins to force DFU mode. My PC recognizes the difference between my
virtual com port (normal mode) and Universal Serial Bus devices, STM32
BOOTLOADER mode (DFU) mode.

I'm not sure what has changed. Any troubleshooting tips would be greatly
appreciated!

Thanks,
Brian

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 wish you a successful fix.

73, Gyula HA3HZ

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 mismatch vs Z0 is reduced. As the layout is not improved (can't do that by changing resistors) the performance of the real v3.4 HW is still better

Do NOT be tempted use a resistor configuration with zero ohm R23 to have a single ended input to the CH1 SA612 as that will destroy your dynamic range (believe me, I tried)



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NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK

ONLY buy from Hugen

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