Re: Through calibration
#calibration
OK, OK... Would that be "Mega Mills" or "Milli Mills"???
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Geoff Peters - AB6BT
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#31925
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Re: Cannot get nanovna-saver to work
#nanovna-app
Hi Roger, I have just quickly tried 5.5 but I got exactly the same results. The following messages were displayed in another window. These were the same for 5.4 NanoVNASaver 0.5.4 Copyright (C) 2019,
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John Knight
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#31924
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Re: Through calibration
#calibration
Don't you mean a mill - a tenth of a cent? Mike N2MS
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Mike N2MS
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#31923
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Re: Through calibration
#calibration
milli...mega...who's counting... New lottery "Milli Millions"! Think of what you could do with millis!
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Geoff Peters - AB6BT
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#31922
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Re: Through calibration
#calibration
We have no allocation in the milliHertz region (mHz)! That's the land of earthquakes and the like. If you meant amateur radio HF allocation, that would be in the MegaHertz region (MHz). Dave - W?LEV
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W0LEV
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#31921
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Re: Gain = f(S12)
Transformers are tricky. The voltage ratio between input and output is roughly the turns ratio, but that's not actually gain/loss, since the power through the transformer is what's constant. A 2:1
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Jim Lux
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#31920
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Re: Through calibration
#calibration
Note that all of this depends on how accurate you need impedance measurements to be. The metal film resistors will work reasonably for calibration if all you need is general log-mag S11, SWR, or
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Stan Dye
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#31919
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Re: Gain = f(S12)
In the case of a measurement of S21 by a nanoVNA + nanaovna-saver is it Vs/E or Vs/Ve? that I find in the file .s2p. Currently I am measuring on transformers and I have a lot of trouble understanding
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Fran?ois
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#31918
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Re: #buying NanoVNA models with MAX2870/MAX2871 PLL
#buying
probably not - the pinouts are "close but not the same" but the other issue is the software that controls the synthesizer. The register maps for the two devices are different. My practical experience
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Jim Lux
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#31917
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Re: Gain = f(S12)
It won't give the same value unless the Zin is 50 ohms. This is always a challenge when specifying (and measuring) gain. Where do you account for the mismatch on input and output? if your 10dB
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Jim Lux
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#31916
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Re: #buying NanoVNA models with MAX2870/MAX2871 PLL
#buying
and then use last fw from dislord!!!! best fw modder ever hi hi dg9bfc sigi Am 22.03.2023 um 19:06 schrieb DiSlord:
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Siegfried Jackstien
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#31915
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Re: Through calibration
#calibration
The metal film leaded have some internal inductance due to the way they are trimmed. Roger
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Roger Need
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#31914
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Re: #buying NanoVNA models with MAX2870/MAX2871 PLL
#buying
LiteVNA contain SD card and RTC and use hardware i2c bus control So V2 and Lite use equual VNA software but different hardware control Yes possible build V2 firmware and add MAX2871 generator control,
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DiSlord
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#31913
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Re: Through calibration
#calibration
Thanks for the info. I am only interested in frequencies up to 60 mHz (typical ham radio stuff on HF bands). I¡¯ll have to order those 805 surface mount resistors. I have some old-school metal film
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Steve Johnson
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#31912
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Re: #buying NanoVNA models with MAX2870/MAX2871 PLL
#buying
sure the board may be different ... (its a new design) i was asking if theoretically that could be done happy coding and have a nice day dg9bfc sigi Am 22.03.2023 um 18:55 schrieb DiSlord:
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Siegfried Jackstien
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#31911
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Re: #buying NanoVNA models with MAX2870/MAX2871 PLL
#buying
No, LiteVNA use different board
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DiSlord
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#31910
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Re: #buying NanoVNA models with MAX2870/MAX2871 PLL
#buying
can one use a v2 hw and replace the pll chip (and use lite fw)?? are they pin compatible?? just thinking if i could replace that pll chip only (bridge performace and channel isolation is a different
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Siegfried Jackstien
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#31909
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Re: Gain = f(S12)
Compared to the attached diagram, I always calculate the amplification as Amplificateion = Vs/E is this the case for S21 or is the result of : Vs/Ve I don't think it gives the same value -- F1AMM
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Fran?ois
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#31908
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Re: Gain = f(S12)
Flawless. thank you very much -- F1AMM Fran?ois
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Fran?ois
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#31907
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Re: Gain = f(S12)
I would assume that S21 is the pair starting with 0.487.. and 0.5028... one thing that is important is to check the header of the .s2p and see whether it is giving you data in dB and degrees, or as
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Jim Lux
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#31906
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