Re: Don't rotate the SMA centre pin! But how do I avoid that?
I hereby solicit further answers to this question, i e other people's takes on this issue. I did glean, from a joeqsmith video, that ideally one might leave two male-female cables permanently attached
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Hans J Albertsson
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#1845
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Re: Early app for the NanoVNA
Just for info, I am having difficulty getting the Python software to run the app. Same errors as other posters have mentioned. Upgrade Python on my Linux Mint and I appear to have all the correct
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Andy G0FTD 3rd Earl of Whitstable MBE BBC ITV etc etc etc etc etc <punkbiscuit@...>
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#1844
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Re: Adding battery to Banggood version
Karl, Have a look at a few of my earlier photos I uploaded. I used a thin 1100mAH battery from an old cellphone. The charging chip used on the Nano will charge almost any small LiIon battery. Do a
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Larry Rothman
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#1843
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Re: Adding battery to Banggood version
FWIW, given the overall construction quality, I'm going to repackage mine when I have some time. I intend putting a much larger battery in - perhaps something that will last 24 hours, so I just have
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Dr. David Kirkby from Kirkby Microwave Ltd <drkirkby@...>
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#1842
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Adding battery to Banggood version
What is the max. physical size the battery can be to add to the Banggood model? Unlike a lot of other models, this one came without a battery, and I am looking for some advice as to what to buy. Do I
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Karl Heinz Kremer
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#1841
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Re: How to measure source impedance?
Output impedance can be calculated (estimated, at least) from the (complex) incremental change in output voltage and current after a small change in load impedance. No need to run anything open
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Hans J Albertsson
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#1840
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Re: How to measure source impedance?
you initially waved around a complaint which might as well be a surrealist's dream: your HT will be un-burnt when you fill your bathtub with brightly colored screwdrivers. and now you make rude
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kb3cs
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#1839
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New file uploaded to [email protected]
Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. *File:* NanoVNA Calibration Considerations and
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[email protected] Notification <nanovna-users+notification@...>
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#1838
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Re: Early app for the NanoVNA
Hi Jeff, thanks for the shopping list :D I'll respond to each: 1) In the LogMag charts, each X-coordinate has a well-defined frequency. In the Smith charts, I would have to find the closest point of
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Rune Broberg
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#1837
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Re: Early app for the NanoVNA
Hi Bob, the app launches a console window first, in which any error messages should appear. If you double-click to launch, that's probably the brief flash you're seeing. You could try opening a
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Rune Broberg
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#1836
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Re: 1500 MHz
FYI - Following 75 Ohm version http://forum.vhfdx.ru/izmeritelnaya-apparatura/pribor-nanovna/msg369476/#msg369476
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RFy
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#1835
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Re: 1500 MHz
Very informative, thanks, this thread leads to a mention of a 1GHz commercial version with a 4.3" display (see below) which in turns leads to its firmware which seems to have been ported for a
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Jose Luu
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#1834
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Re: Don't rotate the SMA centre pin! But how do I avoid that?
Locking collar (or ring)? being the "loose nut" that holds things together.?? Semantics are important and I may have that terminology somewhat distorted. ?Wayne Maynard <wb6bfn@...>?
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Wayne
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#1833
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Re: Don't rotate the SMA centre pin! But how do I avoid that?
"rotating locking collar"? Is that as opposed to a "rotating only" collar? Den tors 5 sep. 2019 07:50Wayne <wb6bfn@...> skrev:
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Hans J Albertsson
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#1832
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Re: How to measure source impedance?
Is my "Unknown 1W source impedance calculation" theoretically correct? -Please ignore real measurement problems below- * My measurement gear still poor * Mismatch reflection happens front of -60dB
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RFy
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#1831
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Re: Don't rotate the SMA centre pin! But how do I avoid that?
Some calibration standards do not have a rotating locking collar. In that case there is no way to avoid rotating the center pin unless you use those very short male-female SMA adapters sometimes
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Wayne
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#1830
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Don't rotate the SMA centre pin! But how do I avoid that?
Try as I might, I cannot keep the pin+back assembly still while screwing the short and/or load calibration piece down in the SMA socket! Should I add some grip to their backs, with glue or solder?
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Hans J Albertsson
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#1829
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Re: How to measure source impedance?
Why you guys talking about 'YOUR HT IS SHIT' or 'BURNT? THIS IS NOT IMPEDANCE ISSUE', 'ANTENNA WILL DAMAGE' or WORRYING ABOUT MY VNA?( I am not stupid, I know right way to connect LNA) Please stop to
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RFy
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#1828
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Re: Building the firmware
I just did a fresh git pull and did a compile with GCC V8 update 3. It worked fine, no issues with SRAM space.
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[email protected]
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#1827
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Re: TDR function vs code space
That is a very nice Idea, I would buy a second one for such work. There is also the path of going to a raspberry Pi that could drive a screen and just grab the raw data for the calculation In fact a
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Pierre Martel <petem001@...>
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#1826
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