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Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

Everyone-
Update- Maggie K replied overnight. They are sending a new case. I do read this blog every day and somehow missed any report of these issues. ( pause for 1st sip of coffee) Versus my 1st smaller NanoVNA, I was surprized that this came in a case... It must be saddening to find an improvement such as a case as nice as it looks now is a problem.

I still am concerned regarding the Multi-switch as with regard to my "old" (3 month) NanoVNA the multi-switch on it is better but not perfect. Inspection of the new multi-switch indicates it's kind of soldered on - surface mount style and would be difficult to remove and replace. I am not warm and fuzzy in that regard.

I will post my adventures in the future and enjoy all the support I have received.
Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

Much ado about nothing: simply slacken the case screws a little to relieve the pressure on the display, and the problem will disappear.

Mine was working fine when I got about (about three weeks ago), but froze after I reassembled it after cutting away the excess plastic at the USB socket. It took me a couple of minutes to diagnose the problem, and ten seconds to solve it. You don't need a new case or major surgery on it.

Regards,
Dave
Re: 70 MHz - 6 GHz spectrum analyser & tracking generator

 

Hello David!
thank you so much for starting a new topic about SATSAGEN!
Cheers,
Alberto
VNA Training Video: Calibration Types for Vector Network Analysis #training #video #calibration #webinar #solt

 

Please keep in mind that this is put on by a reseller of test equipment. (I have no connection with Testforce)
The initial presentation is 20 minutes and is followed by a 25 minute Q&A session.
Next, at the 42 minute mark, the presentation continues with discussions on TRL, Waveguide SSL,TRL, & Horn calibration.
Finally, at the 65 minute mark, there is a discussion of what errors are removed with calibration.

I hope it's of value to forum members.

Calibration Types for Vector Network Analysis | Video Training Feb 25, 2020


In this Measurement-Experts webinar, Copper Mountain Technologies expert,
Brian Walker, covers everything you need to know about the different types of calibration for VNAs.
In this one-hour interactive webinar, you'll learn:
? SOLT, SOLR Calibration
? TRL Calibration
? Waveguide Calibration
? The advantages and setbacks of different types of calibrations
Re: edy555 NanoVNA2 #nanovna-v2

 

you will probably use such a return loss bridge

circuit-diagram-of-a-return-loss-bridge.png

Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

This is a mechanical error that occurred during the production of the first series.
Because the downtime was very long, the manufacturer was not able to make the conversion. If I could recommend it, you might want to add some helpful information to your merchant kit. Anyone who has received the new product will not be able to handle the problem with confidence. There is always an exception. So if the redesign is not workable, then it is advisable to include help information along with the shipment, what is the solution to repairing the malfunction.

This is just a suggestion - I just suggest the opportunity.
- If only the USB connector does not fit in place:
/g/nanovna-users/message/10333

- If the login screen freezes or there is no menu screen when turned on: /g/nanovna-users/message/10369 and
/g/nanovna-users/message/10498 may be the solution.

73, Gyula HA3HZ
Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

Hugen,

Are you going to exchange the units that are not working for new ones?

Maybe send new cases to current owners?

Roger
Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

Sorry, some deformations of the structural parts have caused the touch screen to not work. We are making some modifications to the structural parts, and we expect that we can solve these problems in April.You can temporarily modify it as suggested by Gyula Molnar. If you have any other questions, please contact us at any time, and we will fix it as soon as possible.

hugen
2020-03-13
Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

which is lagging behind:
/g/nanovna-users/message/10369
Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

Hi Lawrence,
glad you got the -H4. Since yours can come from a prototype, I think similar to mine.
I received it at the end of January, among the first. What I encountered was posted in the forum on how to fix it. I think you can have the same error, mechanical, too.
I'm looking for fixes:
/g/nanovna-users/message/10498
/g/nanovna-users/message/10333

Hope these messages help you too.

73, Gyula HA3HZ
Re: NanoVNA -H4 unboxing.... #fix #buying #problem

 

Hi Lawrence,
Sorry to hear about the problems.
If you can get into the touchscreen calibration mode, please recal the touch surface as that can solve some of your posted issues.
The jog switch does leave much to be desired though and many have complained about it.
As for mounting in the case, try one side at a time to see which affects operation.
Good luck!
Larry

On Thursday, March 12, 2020, 1:50:11 p.m. GMT-4, Lawrence Macionski via Groups.Io <am_fm_radio@...> wrote:

Received my NanoVNA H4 yesterday from Maggie King. Unboxed it and 1st thing I did was use the USB cable to charge it. at the USB-C connection a red LED was blinking. This morning Red LED solid.? I decided it had a charge, time to turn it on and check it out..FYI I have a NanoVNA 2.8" since Nov 2019..

1. Turned it on. got a Banner Screen Big blue letters- NanoVNA-H 4 and 11 lines of info..
2. The multi-switch does NOTHING!
3. After 30+ seconds? the right side menu comes up.
? ? a. Multi-switch does not work..
? ? b. touching any option on the right side menu DOES NOTHING.
? ? c. After another 30 seconds it disappears..
4. The screen is now displaying Smith chart and grid, Start 50KHz. Stop 900MHz.
? ? a. only tapping on the screen brings up the right side menu
? ? c. Multi-switch does not work..
? ? d. touching any option on the right side menu DOES NOTHING.
? ? c. After another 30 seconds it disappears..
5. So at this point it is impossible to get into the Calibrate submenu..
? ? a. Multi-switch is not same as my old NanoVNA
? ? b. Multi-switch binding, not operating smoothly.
6. Decision
? ? a. Pack it back up -contact Maggie for replacement
? ? b. Perform a (India help desk term) "KILL THE FLEA" Remove all power - Kill the flea power..
7. Removed all 4 screws and removed circuit board.
? ? a. Battery has removable connection. Removed battery turned on power switch. then 5 seconds later turned off. (KILL THE FLEA)
? ? b. found multi-switch felt "different" (was not smooth operating prior.)
8. Out of the case
? ? a. NanoVNA-H 4 Banner comes up 2-3 seconds
? ? b. Multi-switch works erratically,.
? ? c. can now go to CAL & CALIBRATE Menu -multiple tries.
? ? d. cleaned up the case around the multi-switch to make smoother activation.
9. Reassembled
? ? a. NanoVNA-H 4? is NOT operational
? ? b. Not real happy multi-switch NOT WORKING AGAIN
? ? c. Blue LED flashes irregularly
? ? d. Loosing the case / removing from case? seems to effect operation.
? ? e. Multi-switch intermittent / does not work smoothly.
? ? f. Repeated steps 7-8-9 same results.
10. Conclusion-
? ? a. cold solder joint somewhere.- case torquing board
? ? b. Intermittent multi-switch... looks impossible to replace.
? ? c. Needs replacement / repair
? ? d. DISSATISFIED - Contacting Maggie King.
NanoVNA -H4 unboxing.... #fix #buying #problem

 

Received my NanoVNA H4 yesterday from Maggie King. Unboxed it and 1st thing I did was use the USB cable to charge it. at the USB-C connection a red LED was blinking. This morning Red LED solid. I decided it had a charge, time to turn it on and check it out..FYI I have a NanoVNA 2.8" since Nov 2019..

1. Turned it on. got a Banner Screen Big blue letters- NanoVNA-H 4 and 11 lines of info..
2. The multi-switch does NOTHING!
3. After 30+ seconds the right side menu comes up.
a. Multi-switch does not work..
b. touching any option on the right side menu DOES NOTHING.
c. After another 30 seconds it disappears..
4. The screen is now displaying Smith chart and grid, Start 50KHz. Stop 900MHz.
a. only tapping on the screen brings up the right side menu
c. Multi-switch does not work..
d. touching any option on the right side menu DOES NOTHING.
c. After another 30 seconds it disappears..
5. So at this point it is impossible to get into the Calibrate submenu..
a. Multi-switch is not same as my old NanoVNA
b. Multi-switch binding, not operating smoothly.
6. Decision
a. Pack it back up -contact Maggie for replacement
b. Perform a (India help desk term) "KILL THE FLEA" Remove all power - Kill the flea power..
7. Removed all 4 screws and removed circuit board.
a. Battery has removable connection. Removed battery turned on power switch. then 5 seconds later turned off. (KILL THE FLEA)
b. found multi-switch felt "different" (was not smooth operating prior.)
8. Out of the case
a. NanoVNA-H 4 Banner comes up 2-3 seconds
b. Multi-switch works erratically,.
c. can now go to CAL & CALIBRATE Menu -multiple tries.
d. cleaned up the case around the multi-switch to make smoother activation.
9. Reassembled
a. NanoVNA-H 4 is NOT operational
b. Not real happy multi-switch NOT WORKING AGAIN
c. Blue LED flashes irregularly
d. Loosing the case / removing from case seems to effect operation.
e. Multi-switch intermittent / does not work smoothly.
f. Repeated steps 7-8-9 same results.
10. Conclusion-
a. cold solder joint somewhere.- case torquing board
b. Intermittent multi-switch... looks impossible to replace.
c. Needs replacement / repair
d. DISSATISFIED - Contacting Maggie King.
Re: ON7DQ_NanoVNA_Presentation_English

 

Thanks Larry,
It did say "update ok", but apparently it was not ...
Should be ok now
Luc ON7DQ
Re: edy555 NanoVNA2 #nanovna-v2

 

That is what I suspected, hugen.
Re: edy555 NanoVNA2 #nanovna-v2

 

A reflection bridge like this.

20200312221606.png

Re: edy555 NanoVNA2 #nanovna-v2

 

Probably as balun to provide the bridge with balanced input or to convert the bridge balance to the reflection receiver

--
NanoVNA Wiki: /g/nanovna-users/wiki/home
NanoVNA Files: /g/nanovna-users/files
Erik, PD0EK
Re: ON7DQ_NanoVNA_Presentation_English

 

Hi Luc,
I just downloaded your version 2.02 March 2020 english PDF and there is no difference on slide 25 from the Dec 2019 PDF.
It still shows:
NODE = highest z or maximum voltage

ANTINODE = lowest z or minimum voltage

Regards,
Larry

On Thursday, March 12, 2020, 4:13:41 a.m. GMT-4, Luc ON7DQ <on7dq@...> wrote:

There was still a small error in slide 25 in the English version.
The drawing was correct, but in the text I mixed up the meaning of NODE and ANTINODE.
Now corrected, without changing the version number.
Thanks to Hans DJ7BA for finding it.
73,
Luc ON7DQ
Re: Calibration with nanovna saver(PC) #calibration

 

I think that calibrating with the nanoVNA saver is better, because you can divide the frequency span in segments so you can have a lot more that 101 points hence a more precise calibration. Also nanoVNA saver uses its own calibration files, which should be loaded manually. Probably the calibration stored in the equipment is not used (I am not sure about it).

Also you can store infinite (almost) number of calibrations and you can use the most adequate for the frequency range and the cables (the reference plane) used. The calibration sets are named, so if you define the names to be self explanatory you can avoid to repeat it later.

Ignacio, EB4APL

El 12/03/2020 a las 12:59, Praba Karan escribi¨®:
I am using nanovna saver(PC) with nanovna-h for my needs. What is the use of calibration menu provided in nanovna-saver?. Calibrating with nanovna-saver is just enough, effective and correct?

--
El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus.
Calibration with nanovna saver(PC) #calibration

 

I am using nanovna saver(PC) with nanovna-h for my needs. What is the use of calibration menu provided in nanovna-saver?. Calibrating with nanovna-saver is just enough, effective and correct?
Re: edy555 NanoVNA2 #nanovna-v2

 

That ferrite is before the input though... this seems to be after it.
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