Re: Testing Cookbook Using a VNA
Thanks for the link; that is a useful resource. - Ed
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n5kzw
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#10182
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Re: nanovna-users]NanoVNA-H4 2Port calibration
On Sat, Jan 25, 2020 at 09:19 AM, Jos Stevens wrote: " I'm testing my new NanoVna-H4 iusing NanoVNA-Saver and have a problem doing the 2 port calibration"
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hwalker
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#10181
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Re: nanovna-users]NanoVNA-H4 2Port calibration
Here are polar plots for CH1 connected to CH0 corrected vs uncorrected
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Oristo
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#10180
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Re: nanovna-users]NanoVNA-H4 2Port calibration
Here are screen captures from my "worse clone" for uncorrected vs corrected
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Oristo
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#10179
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nanovna-users]NanoVNA-H4 2Port calibration
I'm testing my new NanoVna-H4 iusing NanoVNA-Saver and have? a problem doing the 2 port calibration . When I have done the last item of the calibration procedure (through) I see a nice sinewave-like
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Jos Stevens
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#10178
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Re: Testing Cookbook Using a VNA
I just reconfirmed it working using a different (Safari) browser not logged into YouTube
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Oristo
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#10177
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Re: Full reflection runs over the perimeter of the smith chart
No, but I do not have semi rigid coax.. First measurement using 35cm RG316 shows loss from 250-400MHz. Second measurement using longer LMR-400 shows loss from 41.67-66.67MHz, approximately matching
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Oristo
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#10176
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Re: Testing Cookbook Using a VNA
Interesting, the link goes to a channel that says there are no videos! Roy WA0YMH
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Roy Appleton
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#10175
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Re: Full reflection runs over the perimeter of the smith chart
Hello Norbert, I think it has to do with calibration. After calibration direct at the nanoVNA CH0 SMA female plug, a 1 m coax cable connected to the reference plane with open at its other end, should
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Rudi
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#10174
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Re: Testing Cookbook Using a VNA
There exist a very good kindle e.book about the Nano Vna :
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Klaus Mueller
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#10173
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Re: Calibration
On Sat, Jan 25, 2020 at 04:54 AM, <sidebores@...> wrote: Can someone tell me please do you have to calibrate everytime you change the start and stop frequency limits. Or is the cal good if its
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hwalker
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#10172
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Re: Testing Cookbook Using a VNA
linked in /g/nanovna-users/wiki/Application-Notes#Collected-wisdom
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Oristo
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#10171
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Re: Testing Cookbook Using a VNA
A source of useful VNA application information at - https://www.nonstopsystems.com/radio/frank_radio_coax-sw.htm
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GM4CID <gm4cid@...>
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#10170
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Re: Calibration
Hello Kev, Interpolation is used, however the routine is not so robust that it would precisely apply without some error introduced. Hence, if I recall you will see a cal* symbol display. If you desire
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alan victor
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#10169
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Re: Calibration
You can limit yourself to the previous calibration. But this is not entirely correct if you want to take measurements on a narrower part of the range. It is advisable to have a calibration for this
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Aleksander Shalygin
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#10168
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Calibration
Hello there, Can someone tell me please do you have to calibrate everytime you change the start and stop frequency limits. Or is the cal good if its within the original cal eg 50Mhz to 400Mhz to 70Mhz
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sidebores@...
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#10167
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Re: NanoVNA-H4 firmware ported to latest ChibiOS
#nanovna-h4
#firmware
#hack
#hacking
On Sat, Jan 25, 2020 at 02:06 AM, Gyula Molnar wrote: " is this problem even without USB connection? Does it return a negative number even when there is no connection between your computer and nano? "
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hwalker
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#10166
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Re: First PCB pictures of the V2
Hi Gabriel It still looks pretty fine. A S11 dB with e.g. 0.1dB/division will tell you a lot compared to a simulated line in SmithChart. A shorted line does not have the S11 sloping trace the first
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Kurt Poulsen
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#10165
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Re: 3D printed nanoVNA-H BNC holder and binding post DUT holder
One BNC-binding post adapter should be flipped to allow thru calibration without crossed wires
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Oristo
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#10164
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Re: Testing Cookbook Using a VNA
Link added in /g/nanovna-users/wiki/User-Guides ( although since not specific to nanoVNA, arguably should be in /g/nanovna-users/wiki/External-links )
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Oristo
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#10163
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