¿ªÔÆÌåÓý

ctrl + shift + ? for shortcuts
© 2025 Groups.io
  1. Nanovna-Users
  2. Messages
Expanded Topics Messages
Date
Re: i need help , NANA VNA-H

 

Thanks Roger , I am understand how it should work , I wish I could get a single dot on the smiths chart . Scattered after reset and cal . It was hot yesterday, so all day I tried to get it to work again.
It a shame just over a year old :(

Maybe I messed with expert settings?

What are the proper settings.

On Sep 5, 2022, at 10:21 AM,

On Sep 5, 2022, at 10:21 AM, Roger Need via groups.io > <sailtamarack@...> wrote:

?On Sun, Sep 4, 2022 at 11:06 PM, Nick M wrote:


The -h dings when i go into dfu boot mode , the device manager has a flag on
it to upgrade driver.
Did you install DFUSe demo? It installs the driver. If you are getting a flag then you can manually update the driver by right clicking and then pointing to the DFUse directory where the driver is located. The location is:

C:\Program Files (x86)\STMicroelectronics\Software\DfuSe v3.0.6\Bin\Driver

This video describes the process >>

The issue , is simple , i reset on the software VNAsaver . 40 version for
this example . i set up the freq range ,1.mhz to 4 mhz
Reset
I start the calibration assistant, all is well. . i hit save , i set up cont
sweep , i get swr all over the place, 1.1, 5.5 etc
with the 50 ohm connected, i take off the 50 ohm the same thing all over the
place . .
Before you start updating the firmware you should check that you can calibrate the NanoVNA in standalone mode without a PC connection. Remember to Reset first. The do the SOL calibration and check for proper operation with each cal load. on the Smith chart you should get a dot on the far left for a short, center for 50 ohms and far right for open. My screenshots shown below.

Roger




image0.jpeg
image1.jpeg
Short.png
open.png
Load.png

Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

I've done that on the theory that the NVNA approximated the size and ground plane of a Baofeng HT. I was able to determine that the cheap tri-band whip sold by one of the recent names in the business is really only a dual band. the vendor has no clue what in the world I was talking about when I asked for test data. They couldn't put me in touch with anyone that wasn't reading talking points off a screen. I got a refund. Thanks, NanoVNA!

73

-Jim
NU0c

On Mon, 05 Sep 2022 11:08:57 -0700
"Dave via groups.io" <dvfuller@...> wrote:

I use my H to evaluate handheld antennas with an adapter connected to the S11 connector and hold it like it was a handheld. I usually touch the ground at the connector and I get pretty decent readings and they're good enough for me to sort the good antennas from the bad ones. I am always amazed at this little device as to how well it works on all my amateur antennas.
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

I use my H to evaluate handheld antennas with an adapter connected to the S11 connector and hold it like it was a handheld. I usually touch the ground at the connector and I get pretty decent readings and they're good enough for me to sort the good antennas from the bad ones. I am always amazed at this little device as to how well it works on all my amateur antennas.
Re: My Win 11 machine does not recognize the Nanovna H4 in DFU mode. #nanovna-h4

 

Thanks for the reply Roger!

Well, I am not a computer tech. Finally figured out that win 10 drivers would work and there is driver loading software in the 64 bit H4 zip file. I upgraded to DIslords
v .1.0.71. Got the H4 talking to NanoVNA Saver and NANOVNA on my tablet.

Calibration works using commercial standards. Matches my home made standards very closely. I do mostly HF with Some VHF and UHF. I have not checked my Home made standards at VHF or UHF yet.

Unable to get the SD memory card to work. Memory chips are probably too new and too large at 32 GB. My H4 platform is STM32F303xC Analog and DSP. TCXO is 26 MHz.

Many thanks to all that made this wonderful piece of test equipment possible!

Alton, NU8L
Re: i need help , NANA VNA-H

 

On Sun, Sep 4, 2022 at 11:06 PM, Nick M wrote:


The -h dings when i go into dfu boot mode , the device manager has a flag on
it to upgrade driver.
Did you install DFUSe demo? It installs the driver. If you are getting a flag then you can manually update the driver by right clicking and then pointing to the DFUse directory where the driver is located. The location is:

C:\Program Files (x86)\STMicroelectronics\Software\DfuSe v3.0.6\Bin\Driver

This video describes the process >>

The issue , is simple , i reset on the software VNAsaver . 40 version for
this example . i set up the freq range ,1.mhz to 4 mhz
Reset
I start the calibration assistant, all is well. . i hit save , i set up cont
sweep , i get swr all over the place, 1.1, 5.5 etc
with the 50 ohm connected, i take off the 50 ohm the same thing all over the
place . .
Before you start updating the firmware you should check that you can calibrate the NanoVNA in standalone mode without a PC connection. Remember to Reset first. The do the SOL calibration and check for proper operation with each cal load. on the Smith chart you should get a dot on the far left for a short, center for 50 ohms and far right for open. My screenshots shown below.

Roger

Short.png
open.png
Load.png

Re: DiSlord v1.2.0 instability even though MS5351 clock-generator is selected (MS-3.6 HW version)

 

So - I am happy to report that new 1.2.14 FW has solved the issue completely !

Thanks for the support :D

Cheers

C
Re: i need help , NANA VNA-H

 

The -h dings when i go into dfu boot mode , the device manager has a flag on it to upgrade driver.
The issue , is simple , i reset on the software VNAsaver . 40 version for this example . i set up the freq range ,1.mhz to 4 mhz
Reset
I start the calibration assistant, all is well. . i hit save , i set up cont sweep , i get swr all over the place, 1.1, 5.5 etc
with the 50 ohm connected, i take off the 50 ohm the same thing all over the place . .

What is wrong ?
Re: cable extensions etc.

 

I get all of my connectors and feedline from RF Connection (www.rfconnection.com). Joes, W3RFC, has top quality products and he supports the ham community. You can see him at every hamfest in the area.
I got sme SMA Male to Female connectors from him and they have worked great.
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

Thanks again :-) I've just read it. As there is no guarantee that I will be able to make repeatable measurements I will buy H model for now, make some tests with ground planes, tiger tails and different setups. When all will be well and the measurements start to make sense then I'll think about the upgrade.

Thanks Everyone.
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

Tish,

This topic was discussed a while ago in this group. I suggest you read the posts in the link below.

/g/nanovna-users/topic/80995721#21095

Roger
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

Hello,
I have both. I have retired the H and now exclusively use the H4.
More points to check a frequency range.
As far as requiring a metal case, I have compared my H in metal case, and the H4. The results are the same for both. Unless you are in a super noisy environment, a metal case is NOT really needed.
Myself, I would buy the H4 again. More features.
Clyde KC7BJE
Re: Anything for Windows 7?

 

Mine too. It got so boringly stable that I sometimes booted it for (small) fun
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

There is now Google group for NanoVNA 2 and 3. You might want look at there too. Then there is this

Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

Thank you very much Roger taking your time for explaining me all of that.

Let's say that I will manage to make repeatable measurement on nanoVNA, so without PC, keeping it in the same position and off interference.
When you're saying that rubber duck antenna is only have of the system, does it mean that when I mount different antennas to the radio some of them will have higher and some lower SWR than measured on nanoVNA.

"you will see the SWR varying all over the place" - is it too optimistic thinking that I can measure if SWR is ~1.5 and not >3.0 or you mean smaller discrepancy?
Re: Anything for Windows 7?

 

My XP installation was extremely stable. I don't remember any crash caused by XP. But faulty application programs could indeed crash the whole machine. The technique to achieve a highly reliable XP system is to weed out such faulty applications.

I understand that newer Windows versions do a better job encapsulating each application, so as to shield the OS and the other applications from a faulty program. But I'm no expert on that matter... Just a user, and electronician.

With Windows 98, before, I had frequent crashes.
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

On Sun, Sep 4, 2022 at 04:26 PM, Tish wrote:


My idea for use of NanoVNA was for checking cheap (chinese) antennas for HH,
that I have available locally, to get more or less precise SWR reading.
If you are referring to testing "rubber duck" antennas for hand held transmitters you need to be aware of a few things. The "rubber duck" is only half of the antenna system. The other half is the metal case of the hand-held and the capacitive coupling between the operator and the handheld case. Manufacturers will do their tests and tuning with the antenna mounted on the radio and a test jig connection to the SWR measuring equipment.

If you just screw the antenna onto the NanoVNA you will not get very good results because you do are not replicating it mounted on the radio. If you try it you will see the SWR varying all over the place as you pickup the NanoVNA and change its orientation. If you connect a USB cable to a computer it will vary even more because you are changing the grounding of the antenna.

What some guys do when testing HT antennas for SWR comparison purposes is use a round pizza pan as the ground plane. They mount a matching connector in the center and then run a cable to the NanoVNA. They suspend the pizza pan/HT antenna away from other objects and then make their measurements. This setup only measures the resonant frequency(s) and SWR. It does not tell you anything about antenna gain or how well it radiates.

Roger
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

On Sun, Sep 4, 2022 at 04:30 PM, Tish wrote:


Does separate RF choke have big impact on SWR measurements?
It all depends on the antenna. If you have a dipole, which is a balanced antenna, and you connect it directly to an unbalanced transmission line (like coax) the outer surface of the coax shield is connected to one leg of the antenna. So it becomes part of the antenna and radiates. When you change the length of the coax or ground it at the radio end this will affect the SWR and the resonant frequency. If a current balun is installed at the feedpoint it will "choke" the current flow on the coax outer shield and considerably reduce this effect.

The J-pole which is a common VHF antenna will also radiate on the coax and the SWR will change as you hold the coax or change the length. Once again a choke is required.

Any decent book on ham antennas will discuss this issue. The ARRL Antenna Book is a good reference.

Roger
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

Are there any advantages of faster CPU, more memory in H4 (vs H) model for occasional use? I have good eyesight so 2.8" doesn't bother me. SD Card is a plus (but not worth the price difference). Does separate RF choke have impact big on SWR measurements?
Re: NanoVNA-H v3.6 vs NanoVNA-H4 v4.3 for SWR measurements

 

My idea for use of NanoVNA was for checking cheap (chinese) antennas for HH, that I have available locally, to get more or less precise SWR reading. As I am grateful for explaining difference between H and newer V2 models, they seem to be overkill for my current needs. I guess I can sell H model if time for upgrade comes or leave it as a backup...
Re: My Win 11 machine does not recognize the Nanovna H4 in DFU mode. #nanovna-h4

 

When you put the NanoVNA into DFU mode and plug it in do you hear the "bing" from Windows that it recognizes the device. If you look in Device manager under USB devices do you see that device is in DFU mode?

Post a screenshot if possible.

Roger
10441 - 10460 of 39502