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Thank you, will try the suggestions. It is the H4.

Max

USB cables are meant for quick insertion and removal by consumers and are backed by the compliance requirements published by USB Alliance. However electronic products are now made to sell more than to be durable, especially those give-away low cost accessories. Most consumers care more about the cost than anything else. Another issue is that the good and bad ones are so much alike, see Amazon not to mention Aliexpress. You can easily find surprisingly cheap RF cables and connectors everywhere. The good old days had gone .....

I'd suggest reinstalling update to see if problem persists, Can't hurt one of em'.

What PC software are you using. Is it NanoVNA Sharp?

Are you using a NanoVNA-H (2.8") or NanoVNA-H4 (4"). If using a NanoVNA-H4 sweep points should be set to 101 for some PC programs.

Roger

I have more than 50 years experience with audio, auto, computer and aerospace electronic systems and slowly moving into the 21st Century with this fancy electronic stuff like nanovna.. One thing I have found is that cables have been, are now, and will likely continue to be a common source of problems in every piece of equipment we touch. No matter how careful I am I still find bad cables in every use I am acquainted with.
It is surprising to me that in all this time cables aren't more fool-proof and idiot-proofed for idiots and fools like me. So, join the club; toss that cable into wherever bad cables go when their life is over and be grateful you learned the lesson...this time. And, don't forget it.

Hi all,

I'm running version 1.0.39 on a Nanovna H model. When connected to the PC, Every time I run an SWR scan "Get Data" I get the following errors:

Corrupted data received [data 0]. Would you like to process it?
Corrupted data received [data 1]. Would you like to process it?
Corrupted data received [frequencies]. Would you like to process it?

I don't recall getting these errors before I upgraded the firmware. It only does it when connected to the PC.

Help? I just build a satellite antenna and would really like to get the gamma matches set!

Max
VE3TMT

Great Idea!!! tl will help me a lot as I keep dropping those!

That was NOT the case here. I had used the very same cable some time ago to
reprogran the firmware to the NanoVNA several times. Now it doesn't work.
Cables go bad. At least I solved the problem.

Zack

<>
Virus-free.
www.avast.com
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<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

Salute!
I am new NanoVNA-H user. Sorry,my English is very poor.
I am industrial electrician in the dairy industry.
1.Installation:
/g/nanovna-users/files/NanoVNA%20PC%20Software/NanoVNA-Saver/nvna-s-pve-rev-d.pdf
2.make DIALOUT for USB and maybe need python3-serial from the Software Manager for USB connection
3.Make START command line for Terminal
cd ~/.venv/nvna-s/nanovna-saver && python3.8 nanovna-saver.py # YESSS!
4. Make Start script.
Example made script

my script saved in the Home/user directory nanovna.sh

------------------------------------------------------
#!/bin/sh
#My first Script for START NanoVNA-Saver
cd ~/.venv/nvna-s/nanovna-saver && python3.8 nanovna-saver.py # YESSSS!!!!
-----------------------------------------------------------

5.Make Launcher to Desktop
Example


Right click on the Desktop and press Create Launcher
Working directory : /Home/user
Command: sh nanovna sh.
This is in 5 minutes and my three vacation days. Now me need learn to use NanoVNA-Saver for HF filters measure

Some of them are for power only, for charging…..


From: Zack Widup<mailto:w9sz.zack@...>
Sent: Saturday, February 27, 2021 5:54 PM
To: [email protected]<mailto:[email protected]>
Subject: Re: [nanovna-users] Bricked NanoVNA-H

Well, on a weird suspicion, I tried a different USB to mini-USB cable
between the computer and the NanoVNA. Suddenly, everything works. So the
trouble was a bad cable. That was the only thing I hadn't tried up till now.

Zack

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Virus-free.
www.avast.com<>
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On Sat, Feb 27, 2021 at 2:14 PM James Anderson <james21170@...>
wrote:

Hi Zack.

Is there any kind of STM device listed in either Universal serial bus
controllers OR Universal serial bus devices within device manager when you
have your NanoVNA connected.

Kind regards, James

Well, on a weird suspicion, I tried a different USB to mini-USB cable
between the computer and the NanoVNA. Suddenly, everything works. So the
trouble was a bad cable. That was the only thing I hadn't tried up till now.

Zack

<>
Virus-free.
www.avast.com
<>
<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

On Sat, Feb 27, 2021 at 2:14 PM James Anderson <james21170@...>
wrote:

Hi Zack.

Is there any kind of STM device listed in either Universal serial bus
controllers OR Universal serial bus devices within device manager when you
have your NanoVNA connected.

Kind regards, James

I use 7/16 surgical tubing on my calibration SMA connectors. Makes them easier to hold and find when i drop them.

73

Roger KC7OM

With my NanoVNA plugged in and using Zadig, zadig lists it as a ChibiOs/RT Virtual COM Port.
I then click on replace driver and once this has run its course it shows up within USB Devices as the said ChibiOs?RT Virtual COM Port.

Then I can right click this device and follow the procedure to find the correct STM driver and update it using browse this computer for drivers, let me pick from a list of available drivers on my computer, which should then show the correct STMicrocontroller virtual COM Port driver to install.

Hope this helps.

Kind regards, James.

Or any kind of device seen when you plug the NanoVNA In, listed within USB Controllers or USB Devices.

As a suggestion, try Zadig to update the driver, this should make it seen within device manager somewhere within USB Controllers or USB Devices, then you can proceed to right click and search for the correct STM driver for the com port.

Hope this helps.

Kind regards, James.

Ken, You are correct in all your observations. Some may wonder why the
window spacing and length is not constant. With constant spacing and
lengths, resonances may be set up on the line due to periodic impedance
modulation of periodically spaced changes in dielectric constant. Long ago
and far away in using a turnstyle on 2-meter SSB and using slip-on ferrite
toroids (the small ones that just fit over RG-58) as a current choke, we
learned to aperiodically space the position of the small toroids. This was
done for the same reason as the aperiodic placement and variable length of
the windows along the window line.

Clearly, the presence of the dielectric along the length of window line
influences the impedance as the velocity factor is measurably less than
unity (a vacuum). More dielectric would yield more capacitance, lower
velocity constant, and lower Zc. Remember the simple formula for the Zc of
a transmission line:

Zc = SQRT [ L / C ] * Pay attention to basic units: pF
is 10^-12 F ?H is 10^-6 H *

Greater C results in a smaller quotient and smaller SQRT.

Dave - W?LEV

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

I'd venture a guess that your need to retune the matching network after a
heavy rain is not due to water accumulation on the window line as it
doesn't wet too well, but rather extremely wet soil against which the
antenna must work. When the soil is extremely wet or almost saturated, the
dielectric constant rises. When only damp, it drops. I saw this effect
while living in the forest west of Fort Collins, Co. I doubt what you are
relating is due to 'wet' window line. I'm familiar with the length of
window line used with the G5RV antennas.

Dave - W?LEV

On Sat, Feb 27, 2021 at 7:39 PM Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

On Sat, Feb 27, 2021 at 10:36 AM, David Eckhardt wrote:

I am convinced that the 'pitfalls' of using window line and variants
expressed in the ARRL Antenna book(s) are false and over stated. From a
theoretical viewpoint, yes, there is an effect. But from a practical
viewpoint (my experience), I find these claims not true. I've used this
stuff for 35+ years for HF wires (doublets not resonant in the ham bands

-

so what....) - about as long as its been available in the amateur market.
Installations were in Albuquerque, New Mexico (15 years), in the forest
along the Front Range of Northern Colorado (15 years), and now in the
foothills of the Front Range of Northern Colorado (7 years)). Over the
years, I've had it coated with snow, ice, dust, water, whatever else

Mother

Nature can throw at it from the environments I have noted. I"ve never
detected any, I stress ANY, major or even minor changes in 'tuning' (low
SWR) or other problems due to weather or naturally occurring

contaminants.

I believe the reservation expressed in the ARRL Antenna book(s) is
unfounded and over stated regarding contaminants. Of course, I've never
lived in any of the really dirty, and possibly salt spray ridden areas of
the country.

I live in the Pacific Northwest where it rains a lot. I have a ZS6BKW
(modified G5RV) with about 40 feet of "450 ohm" windowed ladder line.
Every time we get a heavy rainfall (which happens a lot) the SWR vs
frequency on the different bands (80, 40, and 20) changes considerably and
I have to change the settings on my manual tuner from the dry conditions.

Roger

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

I saw a similar effect when the window line is wet.

I was feeding a dipole with window line. Before I removed it I tired to test the effect of moisture on the line. I built two 450-to-50 ohm attenuator pads.

I connected them back to back and measured the output power of my FT-817 through the two pads with a KD1JV power meter.

I then placed a pad on each of the window line and measured the 817 output with the Power Meter.

I then wet the window line with a garden hose. The delivered power output decreased.

When the line dried the delivered power increased.

It wasn't performed under lab conditions but I did see an effect.

This was performed years ago. I'll see if I can find the data.

I believe you would have less of an effect if you use true latter line.

Mike N2MS

Hi Zack.

Is there any kind of STM device listed in either Universal serial bus controllers OR Universal serial bus devices within device manager when you have your NanoVNA connected.

Kind regards, James

On 2/27/21 11:07 AM, Ken Sejkora wrote:

Great points, Dave. The effect of the dielectric material separating the parallel lines has to be considered. Having said that, doesn’t the size of the “windows” in the dielectric make a difference, as well as the interval length between the windows? I would think the larger the windows and the shorter the distance between windows, the less capacitance there would be. Conversely, wouldn’t a solid dielectric, like that present in 300-ohm twin lead, yield a higher capacitance?

Am I off-base, or do I need to go back to Feedline-101 class?

Sure, as long as the windows are << wavelength, then the percentage of "hole" vs "solid has an effect. if the "percentage of open space" is P%, then the effective epsilon is (1-P/100) + (P/100)(epsilon of the dielectric).? It will actually be slightly different (the fields are higher inside the higher epsilon, and there's fringing effects), but close enough.?? (HV engineers spend a lot of time worrying about this stuff)

So yep, 300 ohm twinlead has higher C per unit length (because a) it's closer, and b) there's more dielectric between the conductors.

You could, in theory, measure the soil dielectric properties by laying a piece of window line on the ground and measuring the Z - because the fields penetrate into the soil. It's tough in practice because the fields don't distribute evenly between soil and sky, and the distribution is dependent on the epsilon.. a dipole on the ground puts about 10 times as much power into the soil as into the air. The ratio is actually epsilon^1.5 ( See Rutledge, D. and M. Muha (1982). "Imaging antenna arrays." IEEE Transactions on Antennas and Propagation 30(4): 535-540.? for a nice analysis.. )

The "open wire line" technique from Hagn and in the ARRL antenna book measures soil properties by creating a balanced feedline totally immersed in the soil.

I've not had time to fool with it, but a NanoVNA should make a dandy soil property probe, and because it can sweep the frequencies, with a pair of suitably designed antennas on the ground (non resonant) you can probably estimate soil properties of the layers, not just the surface.

On Sat, Feb 27, 2021 at 10:36 AM, David Eckhardt wrote:

I am convinced that the 'pitfalls' of using window line and variants
expressed in the ARRL Antenna book(s) are false and over stated. From a
theoretical viewpoint, yes, there is an effect. But from a practical
viewpoint (my experience), I find these claims not true. I've used this
stuff for 35+ years for HF wires (doublets not resonant in the ham bands -
so what....) - about as long as its been available in the amateur market.
Installations were in Albuquerque, New Mexico (15 years), in the forest
along the Front Range of Northern Colorado (15 years), and now in the
foothills of the Front Range of Northern Colorado (7 years)). Over the
years, I've had it coated with snow, ice, dust, water, whatever else Mother
Nature can throw at it from the environments I have noted. I"ve never
detected any, I stress ANY, major or even minor changes in 'tuning' (low
SWR) or other problems due to weather or naturally occurring contaminants.
I believe the reservation expressed in the ARRL Antenna book(s) is
unfounded and over stated regarding contaminants. Of course, I've never
lived in any of the really dirty, and possibly salt spray ridden areas of
the country.

I live in the Pacific Northwest where it rains a lot. I have a ZS6BKW (modified G5RV) with about 40 feet of "450 ohm" windowed ladder line. Every time we get a heavy rainfall (which happens a lot) the SWR vs frequency on the different bands (80, 40, and 20) changes considerably and I have to change the settings on my manual tuner from the dry conditions.

Roger