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Hello,
I am having trouble finding a BOM and schematic for the NWDZ Rev-01-10 RF demo kit kit with google. I have the board with the LPF 30MHz on the top left corner. Could someone point me towards that?

Just to be clear I have this version:


Not this version:

Thanks,
Frank


Frank

Why not try using Hugen's last firmware release or the one by DiSlord

Roger

SWR readings are normal using nanoVNA Sharp v1.02 on PC using USB interface, but nanoVNA SWR trace at bottom of screen with marker showing 1.0003:1 when actual SWR is 1.5:1

My current configuration is attached.

I just updated my nanoVNA to version 0.8.0-20200620 firmware. After going through calibration the Return Loss, Insertion loss, and Smith traces all worked normally, but the SWR trace is stuck as a straight line at bottom of the display regardless of scale settings or return loss on CH0 port. Any suggestions on how to fix this?

You are welcome. I am glad you had success. YouTube is also a great
resource for this kind of thing in addition to many many other things. It
is the second most popular "search engine" for a reason. I assume you do
not use it?

--
Kamryn Kant
Graduate Student
Dept. of Chemical and Biomolecular Engineering
Clemson University, Clemson, SC 29634
*[email protected] <[email protected]>*

GM and Thanks. After looking into that page there is one thing caught my eye that no other documents said to do. Hold down the thumb wheel and turn the unit on, it goes into UDISK mode and you just dump the new .bin file on the unit. Turn it off and back on and it loads the new firmware. Now running 1.4.

Thanks 73
Bob

OK, thank you very much for all info DiSlord.

Regards,

Jos


Op 12-2-2021 om 05:06 schreef DiSlord:

I just learned how to take an S21 measurement at HF frequencies.

I used a 1960's Drake "Low-Pass Filter" (52 ohm in/out) that reduces the higher harmonics of HF rigs.
It used to be called the "TVI" (television interference) filter.
The 1950-1990 tube type HF rigs had a pi-network tuner and some had considerable harmonic output, which obviously got into the older analog TVs. That was often a BG problem back then.

Drake says their filter had 80 dB attenuation above 41 MHz.
My Nano VNA confirmed that presisely down to -80 dB on S21.
But the data looked noisy at that level.
I guess the issue is what DYNAMIC RANGE does the Nano VNA have and at what frequency.
I had the display stop at 100 MHz.

I have enjoyed getting to "know" this gadget.

Barry k3eui

Hi David,

See message # 896, the pdf and then go to page # 6 in that document. A sample of the document below. Please note the RESET command, item 18. Your RESET command as part of a soft key function should be there. No PC etc... required. Source is original firmware from 2019.


Tap the screen again and continue.
13. STIMULUS
14. START 50 kHz.
15. STOP 900 MHz.
16. BACK
17. CAL
18. RESET
Note 10:
Invoking the RESET command at this point is key to a proper calibration sequence. The RESET
button will highlight and stay highlighted. Invoking the RESET function will destroy all the
previously saved calibration data. It is now imperative that this procedure run to completion to
generate new data. Now continue.
19. CALIBRATE

Ask Owo on discord channel (Elon Musk#0678) for bootloader and instructions if need

Here is instruction


Read all. You need ST-Link, need get correct bootloader for device s/n. Replace elements. Flash bootloader. Flash Plus firmware.

Hi Alan,

I'm afraid I've never connected the device to a PC (!), and there is no Reset command in the device's menu tree.

Dave

Hi Dave,

Did you execute the RESET command prior to any cal?

I have the same antique and a one port only device and to date, zero issues.

Alan

Hello DiSlord,

In this message I read that you have modified the V2 to V2plus.

I hope you don't mind my asking, can you please give me some info about this modfication or where to find it.

Thanks in advance,

Jos

Op 11-2-2021 om 21:32 schreef DiSlord:

Have you seen these instructions yet? Other models access DFU another way.

This is the original nanovna I purchased (after which I started [email protected]) in May 2019. The firmware is as was shipped/delivered, never updated (although I started the group and have enjoyed the many discussions since then, I've had little time to use the device.

Question is this - after SOLT calibration at the female device port (no jumper except for the thru test, using the O S L parts that were delivered with this nanovna device in mid 2019), reflection loss S11 with open port does not match expectation.

Frequency limits set to 1 and 100 MHz, followed by OSLT calibration at the device ports. Repeated this to reduce chance of operator error. The standards are those that were shipped with the nanovna in 2019. Device is running with it's internal (original) battery, fully charged.

With port open, S11 shows 7.5 dB (not ~0 dB; starts at 7.50 dB ends at 7.53 dB) across the frequency range (visible both with logmag and smith chart formats.)

With port shorted, S11 is ~0 dB across the frequency range.

With port terminated, S11 is ~-80 dB across the frequency range.

Transmission loss (S21) is < 0.5 dB across the frequency range (0.2 to 0.5 dB).

I do not recall seeing S11 with open port of this nature in the past, although again I've made little use of the unit since new.

Am I doing something wrong? Does this seem like a device issue?

Thanks,

Dave

This is driving me nuts, sine I have the firmware version 0.0.5, I am having a hard time trying to figure out the firmware update process. First off there is no CONFIG tab on the screen when you first bring it up. Am I missing something totally ? The beginners guide shows it but I don't have it.. Can I get a shove in the right direction ?

Thanks
--
Bob Lukaszewski K4HA

One side of the window line goes to the beverage wire. Where does the
second wire of the window line go?

At the VNA end of the window line I would presume the window line wire that
connects to the beverage connects to the center pin of CH0. And the other
wire of the window line at the VNA connects to the VNA chassis or backshell
of the CH0 connector. Where does that second wire of the window line
ultimately connect when you are using the beverage?

To make a measurement, do not hold onto the VNA, but set it on a stump or
empty box well above the soil surface. If all this is the case, the window
line single wire connected to the beverage is just an extension of the
beverage. It has no return at the feed end. The non-beverage connected
wire of the window line should go to some sort of return, like a ground
stake.

Dave - W?LEV

--
*Dave - W?LEV*
*Just Let Darwin Work*

I use Anritsu Site Master S810D for comparsion
For calibration use it calibration kit
Measure SWR 2.0 standart
Foto from:
Anritsu Site Master S810D
V2Plus (modded from V2)
H4 (it have very clean measure, but little lost dynamic after 900MHz)
V2Plus4 (good measure)
Jankae VNA2