Re: RF Demo Kit Testing tutorial released
I have the new version as posted in 7768. The Board doesn't work as it should. Number 8 is very bad and number 10 can be better.
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Klaus W?rner
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#9429
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Re: About cable delay compensation and NanoVna_Saver
#improvement
#test-jig
#tdr
#nanovna-saver
#measurement
Enter the delay in the calibration panel (negative number) the graphs will be updated realtime, no need for new sweep -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files:
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Erik Kaashoek
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#9428
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
Dr. Kirkby, I posted one day regarding safe payment with Alibaba.com I am also not willing to enter my actual billing information! I recently learned of https://www.privacy.com I used this service to
By
Seth Lavinder W8FG
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#9427
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
On Fri, Jan 10, 2020 at 10:03 AM, bill K7WXW wrote: Hugen - Nice work. I am looking forward to working with the improved version. On the alibaba page, the four inch model is the more expensive of the
By
hwalker
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#9426
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Re: Amplitude calibration
Under the assumption that one of the devices, vna or sa is Bad, pad the sa or the vna with say 10 db of pad. This will force a decent match, to the tune of a 20db return loss. Then do your filter loss
By
alan victor
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#9425
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Re: Amplitude calibration
As a check try the same measurement with just a pad. Try a 3 or 6 db whatever pad you may have on hand. The suspect area I believe is either source or load termination either from the vna or the sa.
By
alan victor
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#9424
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Re: Selector switch damaged
To anybody who is wondering how the switch works internally, mine was broken, so I tore it apart and photographed it. Then I enhanced the photo to explain the contacts. -Pete K7PEB
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Pete Buxton
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#9423
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Re: NanoVNA Presentation
#measurement
#nanovna-saver
#tutorials
Its in the files section of the Nanovna group under presentations.? On Fri, 10 Jan 2020 at 4:23 PM, uni berry<uniden355@...> wrote: Hi Luc, Could you please show me the link for the english
By
Larry Rothman
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#9422
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About cable delay compensation and NanoVna_Saver
#improvement
#test-jig
#tdr
#nanovna-saver
#measurement
I have an open circuit on the other end of some 50cm of coaxial cable. What is the easiest way to insert some delay to tune off that cable. NanoVna_save seems to need to calibrate the Vna after every
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Leif M
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#9421
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Re: Amplitude calibration
Yes, that¡¯s exactly what I see
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ejfelix4976 <edsgarage@...>
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#9420
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Re: SimSmith - great, not only for Measuring resonance from coax far end.
Sorry, after having rearranged my text, some not meant to send text had remained below 73, Hans DJ7BA Sorry, please ignore this remainder. Von: DJ7BA <dj7ba@...> Gesendet: Freitag, 10. Januar
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DJ7BA
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#9419
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Re: SimSmith - great, not only for Measuring resonance from coax far end.
Hi Jim, yes, once you got started using SimSmith, you will not want to miss it anymore. It is the perfect companion of NannVNA and NanoVNA saver or any VNA. You can not only ¡°measure resonance from
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DJ7BA
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#9418
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Re: NanoVNA Presentation
#measurement
#nanovna-saver
#tutorials
Hi Luc, Could you please show me the link for the english translation of your presentation? I can not find File Section on your website. Regards [email protected]> wrote:
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uni berry
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#9417
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Re: RF Demo Kit Testing tutorial released
Test field 8 is a series LC. Hence at DC this is an Open. It most have a trajectory that rotates CW and cross the short side of the chart at the series resonate point. There after the Z must be
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alan victor
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#9416
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Re: Amplitude calibration
Just to be clear, you are saying that the vna gives an insertion loss that is different than what the SA TG provides and the difference is as much as 2- 3 dB?
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alan victor
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#9415
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Re: Amplitude calibration
There is a 2 to 3 dB difference between what the spec an says and the nanoVNA. I know the spec an is good as it is calibrated.
By
ejfelix4976 <edsgarage@...>
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#9414
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Re: Amplitude calibration
Is there a difference in S21 after thru calibration using a direct cable between CH0 and CH1? That should not be as the thru calibration should normalize S21 -- NanoVNA Wiki:
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Erik Kaashoek
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#9413
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Re: RF Demo Kit Testing tutorial released
Hello Klaus, It looks like, tha we have slightly differen PCB layouts. My PCB layout was posted in number 9245. 73, Rudi DL5FA
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Rudi
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#9412
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Re: RF Demo Kit Testing tutorial released
Hello Klaus, I am glad that your RF Demo Kit now works as it should. I think it is mainly for learning, and not for every day work. 73, Rudi DL5FA
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Rudi
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#9411
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Re: Amplitude calibration
Thanks for the replies! Actually My spec an has a tracking gen which I normalize. I noticed after doing a cal on the nanovna and nanoVNA F that there is a 2 to 3 dB difference in the measurement. Used
By
ejfelix4976 <edsgarage@...>
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#9410
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