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Re: NanoVNA-Saver 0.1.3
Mel Farrer, K6KBE
Rune, Good Day,
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First time user or want to be, hi. 0.1.3 is downloaded and comes up fine, but does not present a COM port number? What is the best way to approach this? Thanks, Mel, K6KBE On Thu, Oct 17, 2019 at 1:07 PM R D <rdwd3c@...> wrote:
Rune, |
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Re: NanoVNA-Saver 0.1.3
KV5R,
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that's great to hear! :D I try what I can to make it scaleable, but I don't personally have a high-DPI monitor (nor serious vision issues - yet), so I don't have many opportunities to test it. I hope you continue to enjoy it :-) -- Rune / 5Q5R On Thu, 17 Oct 2019 at 22:10, KV5R <kv5r@...> wrote:
Hi Rune, |
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Re: NanoVNA-Saver 0.1.3
Hi Rich,
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it should work with most versions, but I have good experiences with edy555's 0.2.3 firmware: There are instabilities and bugs in firmwares older than maybe mid-September, some of them causing communications issues, so I would recommend upgrading if your firmware is older than that. If you (or others) find a firmware that doesn't work with the app, do let me know. :-) -- Rune / 5Q5R On Thu, 17 Oct 2019 at 22:07, R D <rdwd3c@...> wrote:
Rune, |
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Re: NanoVNA-Saver 0.1.3
KV5R
Hi Rune,
I am very happy that your software re-scales everything, even if it does cause a little "jitter" of the graphs' sizes... I use so many software tools that do not re-scale, and everything breaks and is un-readable, when old-timers like me need to use on a 32 inch display with 150% zoom + increase screen fonts just to to see. I love programs that scale everything to the display, zoom, DPI, font points, etc. Lovin' your software! |
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Re: Supply noise at higher harmonics
#internals
On Thu, Oct 17, 2019 at 03:40 PM, <erik@...> wrote:
OK, great. One less thing to test. What are your thoughts on the transient response of the 3v regulator data sheet I've attached. Also, I wonder if you could lower the noise by running from 2 Li cells (7.4v) through a linear 5v regulator. I assume you've done something like that already. ...Larry |
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Re: Supply noise at higher harmonics
#internals
Well, has anyone measured the +5 V rail(s) to see how noisy they are? Once that is done the specs for the parts powered by +5 V would need to be looked at to see how noise is too much.
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DaveD Sent from a small flat thingy On Oct 17, 2019, at 15:58, bryburns via Groups.Io <bryburns@...> wrote:On Thu, Oct 17, 2019 at 11:32 AM, <erik@...> wrote:Erik, |
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Re: Supply noise at higher harmonics
#internals
On Thu, Oct 17, 2019 at 11:32 AM, <erik@...> wrote:
Erik, This data seems to suggest that if we had better by-pass capacitors on the 5V supply noise in measurements would be reduced. Would you agree? -- Bryan, WA5VAH |
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Re: Any ideas for test jigs?
On this Ft measurement, I think you should try to measure the full set of S parameters. This simply means turning the test set (whatever that currently is) around end for end and measure S22 and S12. If you were able to measure S21 properly with the 20 dB attenuator on CH0 and not overload CH1, then you may not need any pad on CH1. Your S22 values should give you a mag value close to UNITY. At HF, its going to be pretty high and the reactance will be -X or capacitive. On the mag of S12 in dB for any decent device even a 2N3904, you should see -20 dB or less reverse gain. Then go off and calculate Ft with the full equation.
FUN! Alan |
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Re: NanoVNA-Saver 0.1.3
Rune has the S11 values converted to Z series complex, real and imaginary.
He provides the Q as well and this is the Q series value. You can transform from series to parallel and he does this correctly by using the formula: Rp=Rs (Qs^2+1). The series and parallel network equivalent must have the same Q, hence Qs = Qp. Then to find the equivalent parallel form as well the series Imaginary form just use the appropriate Q equations, namely: Qs=Xs/Rs and Qp=Rp/Xp. Hence the X values are found and dependent on the SIGN, choose L or C for the final result. Alan |
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Re: NanoVNA-Saver 0.1.3
Hi Maurizio,
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I'm glad you're enjoying the new version :-) I agree that calibrations should save the start/stop/segments/averaging. It's a great point. I don't know if I want to overwrite whatever frequency span the user has set up when they load the calibration, though. It's a matter of doing what the user expects, and I'm not sure I would expect loading a calibration to change my sweeping setup? That's my thought for now, at least. Showing the marker values on the charts themselves for the values displayed on the chart is an interesting idea. I will put it on the list of new ideas! -- Rune / 5Q5R On Thu, 17 Oct 2019 at 15:29, Maurizio IZ1MDJ <redifon500@...> wrote:
Hi Rune , very happy for the new improvement on the 0.1.3 of nanovna-saver. |
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Re: NanoVNA-Saver 0.1.3
Hi Martin,
I *think* the Cs/Ls you are after is already shown in the marker data display? It's what's shown as "L equiv."/"C equiv." The series resistance is the resistive part of the impedance display. -- Rune / 5Q5R On Thu, 17 Oct 2019 at 14:51, Martin via Groups.Io <martin_ehrenfried= [email protected]> wrote: On Wed, Oct 16, 2019 at 09:22 PM, Martin wrote:document at |
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Re: Adapters, SMA to N and BNC.
A source of inexpensive 50 Ohm adapters.
Free shipping, if you don't mind waiting for a slow boat from China: 1) SMA male to SMA male: $1.20 2) SMA male to SMA female: $1.20 3) SMA male to RPSMA female: $1.10 4) SMA female to SMA female: $0.99 5) SMA male to BNC male: $1.30 6) SMA female to BNC male: $1.10 7) SMA male to BNCF female: $1.10 8) SMA female to BNC female: $1.20 9) SMA male to N male: $1.65 10) SMA female to N male: $1.65 11) SMA male to N female: $1.75 12) SMA female to N female: $1.75 13) SMA male to UHF male (PL-259): $1.75 14) SMA male to UHF female (SO239): $1.75 15) SMA fmale to UHF male (PL-259): $1.75 16) SMA female to UHF female (SO239): $1.65 17) RP-SMA male to N male: $1.70 18) RP-SMA male to N female: $1.75 19) RP-SMA female to N male: $1.80 20) RP-SMA female to N female: $1.80 N0YWB |
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Re: NanoVNA-Saver 0.1.3
Hi Norbert,
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I'll definitely not make a flexible display window for now, as the way the charts are built is not at all compatible with this approach - sorry! Maybe in a far future when everything is refactored. :-) Making a plot of both S11 and S21 LogMag on the same chart wouldn't be too much work, so I might be able to do that. I'll put it on the list! -- Rune / 5Q5R On Thu, 17 Oct 2019 at 10:20, <norbert.kohns@...> wrote:
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Re: NanoVNA WebApp USB question
Hi,
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I used to work for a passive component manufacturer. Had a tiny experience with 0402. Hearing aid manufacturer used an 0402 cap to stop GSM interference. Soldered by hand under a magnifyer. Watched the assembly ladies making it look easy. Me? No chance! I was in my twenties then and I'm 51 now. Later I saw 0201 and then 01005! Static charges made those samples stick to the packaging. Paul On Thu, 17 Oct 2019, 15:53 W5DXP, <w5dxp@...> wrote:
From: sala nimi: Some people said that you can solder anything you see,so get a magnifying glass. |
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Re: Supply noise at higher harmonics
#internals
Erik,
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How much noise is being produced by the LCD refresh? Are you able to run tests with it against the PCB and unfolded out to the side away from the SMA connectors? Can you disable the LCD routines and see how the noise changes? (access via console only). ...Larry On Thursday, October 17, 2019, 1:32:19 p.m. GMT-4, erik@... <erik@...> wrote:
Using the console command "sample" it is possible to measure the pure reference, refl and thru signal strength. First picture shows the change over frequency of the reference signals (only look at the changes in level, the absolute levels differ due to some TAPR VNA internals) According to the internal gain setting table in the nanoVNA there is additional gain added as the frequency moves up. These are the? vertical jumps, each about 5dB at 300, 600,900, 1200, 1500 and 1800MHz. In total about 45dB gain is added in the audio path to compensate for signal loss and with the 10dB delta between lowest and highest frequencies the delta is 55dB, similar to the 55dB measured with the direct connection to the SA612 so the nanoVNA adc and dsp algorithm do maintain the dynamic range. Next picture shows what happens when you use a clean 5V supply. Much less noise in the reference signal. The weird thing with the reference signal is the increase in strength above 1.5GHz. This could be caused by capacitive coupling in the attenuator before the reference mixer Third picture is the change of the amplitude signal (red line) of reflection mixer without anything connected to the SMA CH0 connector, a fairly good open. The change of amplitude over frequency does not show any weird things. The green line shows the leakage from the output signal into the forward mixer. The pattern suggest the attached cable acted like an antenna The fourth picture is the change of the amplitude of the forward mixer. (green line) with a through from CH0 to CH1. The bridge (red line) stops working above 1.5GHz as the characteristic pattern of the cable disappears, possibly because of insufficient measurement SNR Till now I have not been able to get valid phase signal from the bridge above 1.5GHz, only amplitude with at least 20% noise. Comparing the absolute levels of the signals suggests there is about 10dB headroom for increasing the thru signal and about 20dB for increasing the reflection signal. In particular the latter might? have a big impact in the performance of the bridge at higher frequencies. I hope this information is not too detailed but writing it down helps me to understand it much better. |
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Re: Problem with cho45 web interface
Best thing to do is open an issue on cho45's github repo:?
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BTW, I see the same security message. On Thursday, October 17, 2019, 2:06:33 p.m. GMT-4, dk1vi <dk1vi@...> wrote:
Whenever I start from within Chrome browser I get a short message at the bottom flashing up with message "Security error: must be handling a user gesture to show a permission request". When trying to connect another message appears "Type error cannot read type "1" of null". I use hugens latest firmware dated 20191009. No problem with NanoVNA saver. Any ideas? |
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Problem with cho45 web interface
Whenever I start from within Chrome browser I get a short message at the bottom flashing up with message "Security error: must be handling a user gesture to show a permission request".
When trying to connect another message appears "Type error cannot read type "1" of null". I use hugens latest firmware dated 20191009. No problem with NanoVNA saver. Any ideas? |
N0YWB
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