I hadn't calibrated my nanovna for a while and today have discovered it acting strangely. Before when I finished calibration the open read on the far right of the smith chart, the short on the far left and, the load dead center. Today after multiple cal tries on different frequencies my open reads only about 1/3 to halfway to the right and the swr reads only about 3.3.
I put the load on an vom and it reads about 51 ohms. Any ideas?
Battery charge meter is about 1/3 above empty. Can a low battery cause this?
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Use the jog wheel to select CONFIG in the menue, then calibrate the touchscreen.It's a resistive touch surface so you'll need something like a Qtip.
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On Friday, March 20, 2020, 12:33:39 p.m. GMT-4, david@... <david@...> wrote:
Hi all.
I just got a new NanoVNA-H4 from GigaParts. It wasn't sealed so that is a red flag to me.? However, everything is there.? When I turn it on I see the intro screen for about 10 seconds and then it changes to a smith chart.? When I touch it a menu comes up on the right but I cannot select anything.? I can press on the smith chart and it goes away or reappears but that is all I can seem to do.? Any ideas? I have tried my finger and the pick they sent.
Thanks. David
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Hi all.
I just got a new NanoVNA-H4 from GigaParts. It wasn't sealed so that is a red flag to me. However, everything is there. When I turn it on I see the intro screen for about 10 seconds and then it changes to a smith chart. When I touch it a menu comes up on the right but I cannot select anything. I can press on the smith chart and it goes away or reappears but that is all I can seem to do. Any ideas? I have tried my finger and the pick they sent.
Thanks. David
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Hi Robin,
You have 4 options here:
1. buy the newest 3.5GHz unit
2. use your unit with either a tablet, phone or PC via USB
3. check to see if a solder pin on the LCD's ribbon cable got cracked and resolder
??? if the ribbon cable pulled off the LCD end, you're going to need to buy a new display
4. get a new 3.2" display anyway - there is a how-to file in the forum showing how to upgrade and in the meantime, do option 2
Good luck!
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On Friday, March 20, 2020, 11:15:42 a.m. GMT-4, Robin Midgett <k4idc@...> wrote:
While tuning an antenna this evening using my NanoVNA, I dropped it onto
concrete. It landed on the corner nearest the multi-function selector
switch. Now, the display lights up, but there's nothing on the display. The
two blue LEDs behave normally; the one nearest the multi-function switch
changes in intensity as I move the switch, but there's no displayed
data...just the back light. The display doesn't appear cracked or
damaged...just devoid of information.
Using the NanoVNA connected to a PC with NanoVNA software, it works as
it should.
Might any of you have suggestions as how to attempt a repair of the data
display?
Thanks,
Robin Midgett K4IDC
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See this groups software Wiki page, /g/nanovna-users/wiki/home#Software . NanoVNA-saver will run natively in both Windows 10 and Linux. Most of the other software run natively in Windows 10 but require Virtual Box to run under Linux. - Herb
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I think you should not remove the 50 ohms load to CH0 when doing ISOLN.
VR2XHQ
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On Wed, Mar 18, 2020 at 08:47 PM, Hern¨¢n Freschi wrote:
clearconfig 1234 did not seem to help
To calibrate I:
Connect open to CH0, OPEN
Connect short to CH0, SHORT
Connect 50 ohms load to CH0, LOAD
Remove 50 ohms load from CH0 and connect to CH1, ISOLN
Connect CH0 to CH1, THRU
I tried both connecting the loads directly to the VNA, and through male-male
cables with female-female adaptors in the ends (then remove one of the
adaptors to perform THRU).
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hi whats the best software to run for my nano vna i use both linux and windows 10 thank you dave c
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Perhaps this is the perfect excuse to go on Tindie and order the version-2 unit?
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Re: Analysing Input Impedance Matching Circuit for the NE602
I have now added my new transformers to my NE602 circuit and looked at the results on the spectrum analyser. Surprisingly (or not maybe...) the best match using the test circuit's turns ratios were not the best when actually using the transformers in the NE602 circuit.
When using the turns ratios from the best match test circuit of 0.5 turns on the primaries to 8 on the secondaries I got a peak of about -32dB at 10MHz on the output with a -30dB input RF signal.
With a full 1 turn on the primaries to 8 on the secondaries I got a peak of about -16dB on the output with the same -30dB input.
I have added two images to this reply showing the above and a third image showing my original transformers. Using these new ones I can see I have kept the overall gain of the output about the same but have reduced the adjacent unwanted harmonics quite a bit.
I am now very happy with these new transformers and will continue on with creating my new 40m radio.
Thanks again for all the suggestions and advise - it was certainly appreciated.
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While tuning an antenna this evening using my NanoVNA, I dropped it onto
concrete. It landed on the corner nearest the multi-function selector
switch. Now, the display lights up, but there's nothing on the display. The
two blue LEDs behave normally; the one nearest the multi-function switch
changes in intensity as I move the switch, but there's no displayed
data...just the back light. The display doesn't appear cracked or
damaged...just devoid of information.
Using the NanoVNA connected to a PC with NanoVNA software, it works as
it should.
Might any of you have suggestions as how to attempt a repair of the data
display?
Thanks,
Robin Midgett K4IDC
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Re: Analysing Input Impedance Matching Circuit for the NE602
OK, it seems good to me now.
As you know, in those groups with "two one way conversations", one don't realize quite well the level of knowledge of the other side and many times one wrongly assume that he is not doing the things ok.
Best regards,
Ignacio EB4APL
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El 19/03/2020 a las 23:49, Kerr Smith escribi¨®: Maybe I did not understand it correctly, but it appears to me that you
are using cables with open ends to connect to the transformers. If this
is the situation, how do you calibrate the nanoVNA? I have made a set of cables using RG316 with SMA connectors at one end and short wires at the other. I also made a set of open, short, load and through connectors that the wires attach to so I can calibrate the VNA right to the end of the wires.
I know this is not going to work well at high frequencies but for around 10MHz it does seem to work and I have seen a few videos where others have done similar things which gave me the idea to try this.
I think this is similar to your suggested method except I have attached an extra bit of cable and am using my own SOLT connectors rather than the ones which come with the NanoVNA as I can calibrate right at the very ends of the wire.
In reply 11814 I can see the return loss on my cables is around -33dB when CH0 is connected to CH1 at 7MHz and using the supplied cables and through connector (reply 11835) it is around -43dB.
--
El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus.
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Re: Android app and needed USB OTG cables and adapters (must have!)
That is not correct, plenty of Android devices support OTG,
if in doubt about your device check the specs or install "USB OTG Checker"
app.
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On Thu, 19 Mar 2020 at 22:15, DougVL <K8RFTradio@...> wrote: As far as I can tell, every android device would need an OTG adapter or
OTG cable to work with the NanoVNA. That way, the android sees the vna as
an active device and not just as a passive storage device.
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Re: Android app and needed USB OTG cables and adapters (must have!)
Just as a nerd, I figured I'd chime in - just like ebay, there *is *unique
identifier for everything on amazon. It's called it's ASIN. They're
usually about halfway down the page. The one for those adapters (i'm
assuming I found the right ones), is: B015GZOHKW. It also happens to be
the last characters of the amazon listing, as well (minus the identifiers,
referring info, etc.)
And the other one: B00YOX4JU6
~Josh
W0ODJ
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On Thu, Mar 19, 2020 at 4:15 PM DougVL <K8RFTradio@...> wrote: As far as I can tell, every android device would need an OTG adapter or
OTG cable to work with the NanoVNA. That way, the android sees the vna as
an active device and not just as a passive storage device.
I got my nanovna in October or November, 2019. For Black Friday I bought
a Samsung Galaxy Tab A 10.1 and wanted to connect it to the nanovna. I had
already gotten OTG adapter cables for other uses, and have connected a USB
mouse and USB keyboard to an older tablet and even to a phone.
Because I've seen postings by people who have had trouble connecting their
android to the nanovna, I thought I might be able to provide some helpful
information. So, here we go.
For use with the new tablet, I bought this package from Amazon:
CHENYANG Ultra Mini DM Micro USB 5pin OTG Adapter Connector for Cell Phone
Tablet & USB Cable & Flash Disk - 5pcs
They are roughly the size of a fingernail and connect to the nanvna end of
the usb cable. Both ends of the adapter fit Micro USB connectors, so
another cable may be added to connect to the USB-C connector on the nanovna.
In July 2018, I had purchased this adapter =
Rankie Micro USB (Male) to USB 2.0 (Female) Adapter, On-The-Go (OTG)
Convertor Cable, 3-Pack (Black)
which may be another possibility, depending on your stock of USB cables on
hand.
Pasting my old urls/descriptions from my Amazon Orders page don't seem to
show up as links, but the text descriptions should enable a person to find
a suitable adapter. Most seem to come in packages of several. Adapter
cables came 2 or 3 to a pack, and the tiny adapters were 5 of them for a
little over $4 - with free shipping! If you're in a big enough city, with
big, well-stocked computer stores, you might be able to find a local source
for a cable or adapter. But it might be a long search! I'm sure they
would also be on ebay, but Amazon is more convenient for me, plus it has
the reviews which I generally find are very useful.
So - I hope this might help new NanoVNA users who want to connect their
vna to an android device. It sure can help when you're outdoors in bright
daylight!
Doug, K8RFT
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Re: NanoVNA for CB radio tuning
I mean, you could run it in-line, like an SWR meter... but you probably
won't find it very useful soon after that. ^.^
Just to chime in for Chris' comment about Smith Charts... I found this
video by Alan Wolke (W2AEW) great. (I find
most of his stuff super informative, and helpful).
~Josh
W0ODJ
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On Thu, Mar 19, 2020 at 11:44 AM Birdman <ccarrara@...> wrote: Tuning the ¡°CB¡± antenna will be EXACTLY like any other antenna, just
follow the docs in the wiki for the rest of them. There¡¯s definitely a
learning curve though, the nice smart folks on this site make it all sound
soooo easy, but that¡¯s because they know what they are doing and understand
the theory¡¯s behind all this stuff. I¡¯m still trying to figure out who
this guy ¡°Smith Chart¡± is!!! ;-)))
--
Regards,
Chris
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Re: Analysing Input Impedance Matching Circuit for the NE602
Maybe I did not understand it correctly, but it appears to me that you
are using cables with open ends to connect to the transformers. If this
is the situation, how do you calibrate the nanoVNA? I have made a set of cables using RG316 with SMA connectors at one end and short wires at the other. I also made a set of open, short, load and through connectors that the wires attach to so I can calibrate the VNA right to the end of the wires. I know this is not going to work well at high frequencies but for around 10MHz it does seem to work and I have seen a few videos where others have done similar things which gave me the idea to try this. I think this is similar to your suggested method except I have attached an extra bit of cable and am using my own SOLT connectors rather than the ones which come with the NanoVNA as I can calibrate right at the very ends of the wire. In reply 11814 I can see the return loss on my cables is around -33dB when CH0 is connected to CH1 at 7MHz and using the supplied cables and through connector (reply 11835) it is around -43dB.
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Re: Beverage Antenna Patent
It will make ANY Beverage that u want !
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Android app and needed USB OTG cables and adapters (must have!)
As far as I can tell, every android device would need an OTG adapter or OTG cable to work with the NanoVNA. That way, the android sees the vna as an active device and not just as a passive storage device.
I got my nanovna in October or November, 2019. For Black Friday I bought a Samsung Galaxy Tab A 10.1 and wanted to connect it to the nanovna. I had already gotten OTG adapter cables for other uses, and have connected a USB mouse and USB keyboard to an older tablet and even to a phone.
Because I've seen postings by people who have had trouble connecting their android to the nanovna, I thought I might be able to provide some helpful information. So, here we go.
For use with the new tablet, I bought this package from Amazon:
CHENYANG Ultra Mini DM Micro USB 5pin OTG Adapter Connector for Cell Phone Tablet & USB Cable & Flash Disk - 5pcs
They are roughly the size of a fingernail and connect to the nanvna end of the usb cable. Both ends of the adapter fit Micro USB connectors, so another cable may be added to connect to the USB-C connector on the nanovna.
In July 2018, I had purchased this adapter =
Rankie Micro USB (Male) to USB 2.0 (Female) Adapter, On-The-Go (OTG) Convertor Cable, 3-Pack (Black)
which may be another possibility, depending on your stock of USB cables on hand.
Pasting my old urls/descriptions from my Amazon Orders page don't seem to show up as links, but the text descriptions should enable a person to find a suitable adapter. Most seem to come in packages of several. Adapter cables came 2 or 3 to a pack, and the tiny adapters were 5 of them for a little over $4 - with free shipping! If you're in a big enough city, with big, well-stocked computer stores, you might be able to find a local source for a cable or adapter. But it might be a long search! I'm sure they would also be on ebay, but Amazon is more convenient for me, plus it has the reviews which I generally find are very useful.
So - I hope this might help new NanoVNA users who want to connect their vna to an android device. It sure can help when you're outdoors in bright daylight!
Doug, K8RFT
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Re: ON7DQ_NanoVNA_Presentation_English
Hi Jean-Roger,
Thanks for finding another typo.
I'll correct the slide soon.
I had first taken a 9 MHz step (full range of 900 MHz, divided by 101 points, is roughly 9 MHz)
But this gave only 22m maximum length (or 11m if you divide by 2), so I changed the step to 1 MHz, but forgot to change the 9, hi.
Now as for the lenght, divide by 2 or not, I'm not sure ...
I got the info from this site
(and I believe also Rune got the Python code there for nanoVNA Saver)
I seems the FFT routine calculates the time to the open end from the S11 values, so that would be "one way", and so also the "maximum length" in that article would be the distance to the fault (open).
My "feeling" says that indeed we should divide it by two (I'm also from the "old school" TDR measurement ... with an impulse sent , and seen on a scope ...)
I'm not a mathematician at all , so maybe someone else can clarify what is the correct answer ?
73,
Luc ON7DQ
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Looks like mine is moving to the next step forward after being stuck for 5 days at the Shanghai International Mail Exchange Station
2020-03-19 10:05
Shanghai, delivered to air transport
Hope to get it soon!
Reinier
Op 19-3-2020 om 21:50 schreef Neal Pollack:
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Yes, same here. Stuck at airport. That's why I posted.
It points to the fact that no flights are being permitted between
USA and China. For previous orders from China, it usually is
only at the airport for a day or two, then shows landed in destination
country.
Oh well. Maybe we will get them in late summer...
Neal
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Yes, same here. Stuck at airport. That's why I posted.
It points to the fact that no flights are being permitted between
USA and China. For previous orders from China, it usually is
only at the airport for a day or two, then shows landed in destination
country.
Oh well. Maybe we will get them in late summer...
Neal
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Neal AB6G
Robin Midgett