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Re: How is isolation calibration done?
Preferably, with a 50 ohm load on both ports. If you only have one, put it
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on "ch1" (port 2 - confusing numbering). Isolation tries to establish and cancel out the base level of noise in the passive channel of the device. (At least that's how I've been taught it) -- Rune / 5Q5R On Mon, 14 Oct 2019 at 19:10, sala nimi <sala.nimi@...> wrote:
I am using NanoVna saver software and the last action in the calibration |
Re: Newbie questions
On Mon, Oct 14, 2019 at 07:40 AM, W5DXP wrote:
Thanks very much, Cecil. I've been too chicken to attempt updating the firmware. Maybe it's time to bite the bullet. Mel -- edy 0.2.3 is *firmware* that would need to be downloaded onto the NanoVNA platform, itself. I've never attempted it, so I don't know how difficult it is. But take a look at the Wiki section of this group, there are probably instructions. Also -- you should be able to see X in terms of ohms with NanoVNA-saver. Here's a closer look at a screenshot. You can see that the primary marker readout is in terms of ohms for both R and X, and the plot's 'jX' axis (vertical axis, right-hand side of the top plot) is in terms of ohms. - Jeff, k6jca |
Re: Are there any guidelines for hacking the firmware?
Please be aware both code space and ram are almost full. Any big additional functionality will imply taking out other functionality possibly leading to PC side incompatibility.
Do not dig a private hole but connect on GitHub and submit proposals for improvement with implementation. People like edy555 and hugen are very good at minimizing the footprint of the SW. They may take your ideas and further improve The collective is much stronger than the individual |
Re: errors of "error" models
Dr. David Kirkby from Kirkby Microwave Ltd
Would ¡°uncertainty of errors correction terms¡± not be a better title?
On Mon, 14 Oct 2019 at 15:24, yza <yzaVNA@...> wrote: #45 : errors instead of "errors" : [NanoVNA] Indications forDr. David Kirkby, Kirkby Microwave Ltd, drkirkby@... Telephone 01621-680100./ +44 1621 680100 Registered in England & Wales, company number 08914892. Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United Kingdom |
Re: Newbie questions
Mel Farrer, K6KBE
Please explain edy 0.2.3 SW Thanks
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Mel, K6KBE On Mon, Oct 14, 2019 at 7:40 AM W5DXP <w5dxp@...> wrote:
Jeff Anderson wrote: I just took a look at my NanoVNA ... and I don'tsee any way to display R and X. |
Re: errors of "error" models
#45 : errors instead of "errors" : [NanoVNA] Indications for
"standard" Nominal Values Hello, Allow us, please, to demonstrate the big difference between Indications and Nominal Values for [AnyVNA], using our [NanoVNA] and our "standard" load [ref2007box], measured by our [VNA] and thus having the BLUE Nominal Values against the RED Indications, taken with our [Nanovna], in the following two figures - in terms of frequency: "Amplitude" of Rho (in "non-dB" pure numbers) : "Phase" of Rho (in degrees) : After that, allow us, please, to rhetorically ask : "Is there an observer who would like to not call "errors", but just errors without quotes, these really big differences ?" Sincerely, gin&pez&arg 45# |
Re: Save S21 data in CSV format
On Mon, Oct 14, 2019 at 03:14 AM, hwalker wrote:
Herb, John Gord is on the right track about the phase. To be a bit more specific, the phase angle from -180 to 180 degrees in Excel is converted using atan2(im,re) which is the four quadrant arc tangent. The result from atan2() in Excel is in radians and you must convert to degrees if that is what you want. For example, to get the phase angle in degrees from S11 in row 5 once you load the S2p file into Excel you will need to put the equation "=atan2(c5,b5)*180/pi()" in a cell, say column 11 or something like that. Have fun. -- Bryan, WA5VAH |
Re: Are there any guidelines for hacking the firmware?
On Mon, 14 Oct 2019 at 04:49, Dr. David Kirkby from Kirkby Microwave
Ltd <drkirkby@...> wrote: There are some features that I would like added to the firmware connectedI hesitate to /instruct/ anyone on firmware, but I have some thoughts to share. tl;dr There is a minimum set of skills that should be in place before modifying the firmware, even for one's self alone. If one is contemplating getting started in firmware mods, one might consider the following: 1) Download the firmware source code 2) Set up the compiler environment 3) Make the most trivial change possible: set the board/version text and compile the firmware 4) Flash the changed firmware and test it Once comfortable with this skill set, one might progress to understand how: 5) The firmware interacts with ChibiOS 6) The firmware interacts with the hardware 7) The firmware implements VNA algorithms 8) To return/donate code to Github If all this sounds... unappealing, I would counsel that one should make a formal feature request on Tomohiro's Github. --buck |
Re: Newbie questions
Hi Mel, good to see you (and your Bauer) on the group.
I just took a look at my NanoVNA (which I've had for a month or two, so it doesn't have the latest firmware), and I don't see any way to display R and X. In fact, I only see R and X as marker annotation when displaying the Smith Chart (and in this case X is not in terms of ohms, but apparently H or F). But if you don't mind using your NanoVNA with a PC, check out the NanoVNA-Saver application, which runs under windows. (You can download the .EXE file from this page: ) I've attached a screenshot showing a plot of S11 in terms of R and X (it's the top plot of the two). Is this what you are looking for? Best regards, - Jeff, k6jca P.S. It's a very cute little tool. I've added N connectors to mine. Tell Ray 'VAB he should get one, too. |
Re: First real measurements with nanoVNA at
Erik,The Japanese Ham on twitter (I put photos in the files section) was running CH0 from an ext supply per the top photo. What would happen if you raised the supply voltage? It can take 8v max.?The spec sheet shows a VCC filter using a 5.5uH and a couple of caps.?
Also, that ip5303 is probably putting out a pile of radiated RF noise not only on the supply lines. Try running the device on 4 AA batteries for your next test. I don't know off hand what the max Vin for the 3v Reg is though.? Larry On Mon, 14 Oct 2019 at 3:04 AM, erik@...<erik@...> wrote: Changed the offset from 5kHz to 12kHz and running the nanoVNA? directly from a linear 5V power supply. Even with USB connected the latter makes a substantial difference in noise levels Guess adding some inductors to the nanoVNA to block VHF/UHF supply noise is the next step |
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