Regarding calibration of a nano-vna
#calibration
Given my limited work with a NanoVNA I ask: It appears the calibration routine (so far I have only needed for one port) is done without regard to any parameters being set. Once it is done and saved
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Richard Clemens
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#23325
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Re: Capturing and saving measurements
How does this differ from "nanovna-saver" and is it better or just different. I find the <saver> to be extremely useful and helpful.
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Richard Clemens
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#23324
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Re: Capturing and saving measurements
I would assume it can be found at the same place you got the version you are using now (if you are already using SimSmith). Try here: http://www.ae6ty.com/Smith_Charts.html Scroll down to download.
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Jim Allyn - N7JA
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#23323
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Re: Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
Fixed - file name was confusing! David -- SatSignal Software - Quality software for you Web: https://www.satsignal.eu Email: david-taylor@... Twitter: @gm8arv
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David J Taylor
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#23322
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Re: Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
Barry, Many thanks for that! Having fun getting it on my iPad for ChromeCasting to the TV. I see Par
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David J Taylor
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#23321
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Re: Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
This is really great. Thank you Martin N6QLH
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Martin Glazer
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#23320
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Re: Capturing and saving measurements
How about putting horse before cart and give link to the software before telling how to use it ?
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Anne Ranch <anneranch2442@...>
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#23319
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Re: Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
The link that Barry posted is not complete. Try this one https://onedrive.live.com/?authkey=%21AOlXMsSXT3kGgq8&id=DBA2EEF9A205C9D2%2152659&cid=DBA2EEF9A205C9D2 -- *Don - W3DRM*
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W7DRM - Don
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#23318
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Re: Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
When I click on the link it goes to outlook live. Charles Miller
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Charles E. Miller
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#23317
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Re: Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
For some reason I¡¯m having trouble downloading your updated files. Charles Miller
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Charles E. Miller
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#23316
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Capturing and saving measurements
?A new utility has been introduced in SimSmuth. This utility can be used to connect to, calibrate, initiate measurements, write touchstone files, and import them for further analysis. A quick
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ward harriman <ward.harriman@...>
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#23315
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Re: That pesky 50 to 75 ohm conversion.
Yes, you could do it with a 50 ohm analyzer and mathematically convert. I'm not sure a 75 ohm OSL kit would be super difficult. You'd have to choose a 75 ohm connector family (i.e. BNC, TNC, F, I
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Jim Lux
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#23314
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Re: That pesky 50 to 75 ohm conversion.
This is a long thread so this might have been mentioned already. I bet I am way out of line. Sorry. Why can't the measurement be made with a 50 ohm network analyzer? We're just looking at impedance so
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WB2UAQ
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#23313
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Nano VNA Prt I Basics: Part II Under the Hood de k3eui
#video
This is the most recent video on my presentation: Nano VNA Part I The Basics (not much math) Nano VNA Part II The Under the Hood Approach (Advanced topics) I'll also include the latest PDF of the
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Barry K3EUI
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#23312
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Re: That pesky 50 to 75 ohm conversion.
I test ojisankoubou Z normalization code, adaptate it to NanoVNA Calibrate NanoVNA by 50 Om load Measure 25 Om (SWR = 2 and dot at left smith) After add DUT impedance as 25 Om and calculate how it
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DiSlord
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#23311
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Re: That pesky 50 to 75 ohm conversion.
And quite a number of special applications use something entirely different than either 50 or 75-ohms, not to mention 30-Ohms. Take the 'flash' lasers at Los Alamos and Phillips lab, to name a couple
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W0LEV
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#23310
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Re: That pesky 50 to 75 ohm conversion.
A resistive pad does NOT transform from a reference impedance of 75 ohms to a reference impedance of 50 ohms.? A transformer would (over some frequency range). All a resistive pad (of whatever loss)
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Jim Lux
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#23309
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Re: That pesky 50 to 75 ohm conversion.
Here is a good explanation https://youtu.be/I-OnQZJv35I wrote: Kenneth Hansen Owner
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Kenneth Hansen <khansen@...>
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#23308
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Re: That pesky 50 to 75 ohm conversion.
Actually, there is a good reason for 75 ohm coax. If you plot cable loss versus impedance, you will find that minimum loss occurs at 75 ohms. When you've got miles and miles of coax strung everywhere,
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Jim Allyn - N7JA
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#23307
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Re: That pesky 50 to 75 ohm conversion.
There are two issues: First the one from OP: he built at 50/75ohm pad and calibrated the NanoVNA with a 75ohm load. The pad transforms every impedance on its 75ohms side into the 50ohms world of the
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Uwe Lange
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#23306
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