Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
Apologies in advance for a dumb question about firmware/hardware - I've been away from this forum for more than a year...
I have the original nanoVNA hardware version (purchased 2019) - is the nanoVNA-H firmware compatible with this, or is there a different place I should be looking for the "classic version" firmware?
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Re: 340 MHz Dipole - Calibration at Transmitter and Antenna Ends of Transmission Line
Sorry Dave. Simply not the case. A matched transmission line made of coax does not radiate from the shield. That is why it is called a ¡°transmission line¡± And not an ¡°antenna¡±.
A quarter wave and a half wave transmission line, along with a transmission line of any length terminated in its characteristic impedance are all ¡°matched¡± by definition. Matched transmission lines do not radiate.
Ferrite beads, choke baluns, and other means of common mode rejection are not necessary under matched circumstances. Though not necessarily gimmicks, they are often employed to overcome a poor installation and to mask the real problems.
Warren Allgyer - WA8TOD
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
That does not mean much, I had a board that was, by the looks of it,
identical to H 3.4 but some of the component values were different.
With open source projects, in 99% of cases sources are provided on
github, gitlab etc.
BTW
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While reading the " to GPL or not to GPL " I finally identified my
nanoVNA - somebody posted nice picture with the battery removed and there
it is "nanoVNA H "
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
Version screen contain information about sources.
My H/H4 github
But i not provide V2 sources (most v2 vendors close it, F / F V2 / V2Plus / V2Plus4)
In my case It use H/H4 code and i rewrire 80% hardware code
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
Looks as I need to apology for my last post
Just checked some firmware files and it appears it is NOT customary to provide source code here.
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
I was just reading the mail and found this , very old discussion
Possible location of latest VNA source code??
I am NOT interested starting / having another extended ( and full of personal opinions about GPL ) discussion about GPL ,
however,
I like to know if the doc just published include actual source code or include some instruction how to retrieve source code .
You can tell I have no idea what .rar file include or does not include.
I can guess what "versions" are the latest and that is about it .
BTW
While reading the " to GPL or not to GPL " I finally identified my nanoVNA - somebody posted nice picture with the battery removed and there it is "nanoVNA H "
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Re: 340 MHz Dipole - Calibration at Transmitter and Antenna Ends of Transmission Line
Thanks Charlie, Warren, and Dave W0LEV for the additional help and information. It looks like my original thinking on the two plots was basically correct. The NanoVNA really is a wonderful tool and I've had a lot of fun doing all kinds of experiments.
I now have my NanoVNA-H4 providing 401 data points for the 200 MHz to 500 MHz range. I had calibration information stored for several other antennas and apparently hit a memory limit.
The simulation provided by Dave NU8A is quite impressive considering that my antenna is not in free space and the resonant frequency is somewhat higher than the model. We also don't know the exact characteristics of the antenna, transmission line, and adapters. With 401 data points, the resonant frequency appears to be a little over 344 MHz. The 6 inch SMA to SO-239 adapter uses 50 ohm RG-316 coax.
The antenna is in a large first story room and about 5 feet above the floor on a vertical mast. Very slight changes are detectable if I rotate the antenna so nearby objects must be having some effect. As several people have suggested, the feed line would also be a radiator. Slight changes are seen when touching the coax cable or changing its position relative to the mast.
73, Kent
AA6P
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
Hello Hugo!
Internally, SAA-2N has identical PCB as SAA2 with 2.8 inch display, but 4 inch display and N connectors.
Best regards
Vladimir, dl7pga
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
I received one of the first copies of the SAA2N with a 4 "screen. So it would be compatible?
Hugo
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-------- Message d'origine -------- De : DiSlord <dislordlive@...> Date : 2021-07-24 17 h 34 (GMT-05:00) ? : [email protected]Objet : Re: [nanovna-users] NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69 #firmware SAA2N some as V2 480x320
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
Does this fw work with NanoVNA 2N (SAA2N)?
Hugo
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-------- Message d'origine -------- De : DiSlord <dislordlive@...> Date : 2021-07-24 16 h 12 (GMT-05:00) ? : [email protected]Objet : [nanovna-users] NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69 #firmware v1.0.69 Made some firmware unification, build for all platforms (H / H4 / V2 / V2Plus / V2Plus4) New features since 1.0.64: - For V2 port most H/H4 features - Added measure module (User need select correct frequency range) MARKER->MEASURE: * allow auto cable measure (length, loss, wave impedance) range - S11 smith should rotate from min to 180 degree counterclockwise) * allow auto XTAL / LC measure, range - should visible Fp and Fc peaks (Rl option in measure menu allow set R visible by Xtal, = 50 om for NanoVNA, but can be different if used special test fixture) - Added Z renorm option (DISPLAY->PORT Z: 50 -> XX), allow measure (see how look) system vs different from 50 Om impedance (include filters), example allow see how look 75 Om antennas measured by NanoVNA (experemental option) - For V2 added SD cart support (not activated), allow in future add SD card slot (feature tested on new V2 test board) - Added fw dump expert option (allow dump current firmware and settings to SD card) - Some code fixes PS V2Plus4 not allow measure XTAL, so this option disabled, for V2/V2Plus on select measure XTAL / LC used special adaptation, for better measure need use avg >= 5.
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Re: Exhausting attempts to insert U-FL connectors
On 7/24/21 2:00 PM, Andrea IK0RNT wrote: Thanks, Rudi.
I already came across your guide, though I underestimated the importance of using a screwdriver to press the connector.
Anyway I must have broken something with my subsequent attempts. I could properly insert just one connector. No way so far to achieve the same result on the other socket with the other plug.
Besides, the "Short" socket is gone, by now. So I've gotta give up, possibly ordering some U-FL SMD socket to make the replacement... and perhaps some cable with the U-FL plug too? I mean, might have damaged the U-FL male as well?
A.
There is, also, a little tool designed to demate these without ripping the connector off the board.? Probably one for mating, as well. I've no idea where to get them, but I've held the demate tool, so someone got it somewhere.
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Re: Exhausting attempts to insert U-FL connectors
On 7/24/21 2:00 PM, Andrea IK0RNT wrote: Thanks, Rudi.
I already came across your guide, though I underestimated the importance of using a screwdriver to press the connector.
Anyway I must have broken something with my subsequent attempts. I could properly insert just one connector. No way so far to achieve the same result on the other socket with the other plug.
Besides, the "Short" socket is gone, by now. So I've gotta give up, possibly ordering some U-FL SMD socket to make the replacement... and perhaps some cable with the U-FL plug too? I mean, might have damaged the U-FL male as well?
A.
There is, also, a little tool designed to demate these without ripping the connector off the board.? Probably one for mating, as well. I've no idea where to get them, but I've held the demate tool, so someone got it somewhere.
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On 7/24/21 12:27 PM, Reginald Beardsley via groups.io wrote: I am assembling a portable RF bench setup with a nanaoVNA and 3 tinySAs among other things. I would very much like to be able to use a GPSDO (e.g. RFzero) to synchronize all of them.
With sufficient flash space, a one second tick sent over USB would probably be "good enough" in consideration of the other limitations.
Please consider this.
Thanks,
Reg
Synchronize the sweeps/measurements, or syntonize the oscillators?
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Re: Exhausting attempts to insert U-FL connectors
Thanks, Rudi.
I already came across your guide, though I underestimated the importance of using a screwdriver to press the connector.
Anyway I must have broken something with my subsequent attempts. I could properly insert just one connector. No way so far to achieve the same result on the other socket with the other plug.
Besides, the "Short" socket is gone, by now. So I've gotta give up, possibly ordering some U-FL SMD socket to make the replacement... and perhaps some cable with the U-FL plug too? I mean, might have damaged the U-FL male as well?
A.
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Re: NanoVNA H / H4 / V2 / V2Plus / V2Plus4 firmware v1.0.69
#firmware
Some screenshots:
On it i measure 75 Om cable ~5.2m (measured as 83 Om)
Apply adaptation Port Z: 50 - 83 Om (visible as circle move to smith center)
Measure 50 Om cable (310 mm)
Measure 16M XTAL in various modes (SHUNT / SERUES)
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I am assembling a portable RF bench setup with a nanaoVNA and 3 tinySAs among other things. I would very much like to be able to use a GPSDO (e.g. RFzero) to synchronize all of them.
With sufficient flash space, a one second tick sent over USB would probably be "good enough" in consideration of the other limitations.
Please consider this.
Thanks,
Reg
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For my new NanoVNA-H, marked version 3.5 on the plastic parts case, at one time I found a menu display showing options for a choice of frequencies going down to 30 Hz, which I assumed was "resolution bandwidth". I do not recall whether I found this before upgrading the firmware from the supplied one to the 1.0.64 version. When I selected 30 Hz the sweep was much slower, which would accord with what I have seen with a spectrum analyzer when finer resolution bandwidth is selected. I am now unable to find the menu tab that provides this choice of frequency options. Can anyone tell me how to get to that menu item and what exactly it provides if not "resolution bandwidth"? Thank you.
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Re: Exhausting attempts to insert U-FL connectors
Yeah. My new Yaesu has a ton of these U-FL connectors. I figure getting experience with these on this demo board is good practice before doing the same in more consequential circumstances.
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Re: 340 MHz Dipole - Calibration at Transmitter and Antenna Ends of Transmission Line
Not just a quarter wave of coax in a mismatch. Any additional length of
coax or transmission line with SWR (mismatch) will produce modification of
impedance. Play with SimSmith using nothing other than additional series
lines in a mismatched condition. It's a good educational tool as well as a
design and evaluation tool.
Installation of ferrite beads and/or choke balun at the feedpoint of a
balanced load will affect the impedance as, without those, the outside of
the coax shield is part of the radiating structure.
Dave - W?LEV
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On Sat, Jul 24, 2021 at 8:04 AM Warren Allgyer <allgyer@...> wrote: There is not much mystery here. Transmission lines that are mismatched at
all create impedance transformations at every odd multiple of a quarter
wavelength. They become transparent, meaning the impedance at the input is
exactly the impedance at the output, at even multiples of a half wave.
Calibration at the input allows you to see the same load your transmitter
sees. Calibration at the output will show the actual impedance of the
radiator.
Ferrite beads and baluns do not affect either measurement unless they
introduce loss or an impedance transformation. Baluns especially are
misused as matching devices because, when not properly deployed, they
introduce loss. Loss reduces reflected power by a 2X factor and lead to
grossly misleading VSWR readings at the input side of the coax.
The nanoVNA is a wonderful tool for both.
Warren Allgyer - WA8TOD
--
*Dave - W?LEV*
*Just Let Darwin Work*
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Warren Allgyer
Vladimir Lebedev
Lou W7HV