Good afternoon.
The same problem with saving to the card.
Kingston 8Gb HC Card.
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Re: Transimission mesurements
Jens,
1) there is the odd Doll on this group as well as [far too many, /pro rata/] Guys
2) for the technical question, imagine that there are *2* oscillators active, one at f?, one at f?+IF, where IF is an intermediate frequency and f? is the measurement frequency. Then, as square waves, the measurement oscillator will produce frequencies f?, 3f?¡, and the local oscillator will produce frequencies f?+IF, 3f?+3IF¡ Then at the fundamental frequency, the difference frequency is IF, but when the third harmonic products mix, the difference frequency is 3IF. The products at 3IF will be rejected by the post mixer bandpass filter.
3) similar arguments apply when harmonic mixing is employed, such as for the 300?MHz - 900?MHz range. Note in this case, that there will be an unwanted product from the fundamental frequencies at ?IF (hence the use of a bandpass, rather than lowpass, filter) and the 5^th harmonic at 1?IF.
Also note the reducing power in the harmonics, thus doubly reducing the mixer products to be measured. The fact that any of this works is a triumph of human ingenuity and DSP.
4) Identifying all the frequencies and corresponding mixing products for n^th harmonic operation is left as an exercise for the interested reader!
HTH, 73, Stay Safe,
Robin, G8DQX
PS: For this sort of hybrid analogue & digital machine, often the block diagram is more informative than the circuit (schematic) diagram. The actions of the software are also key components.
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On 20/12/2021 11:11, Jens M?ller wrote: Hello Guys,
I've one question which puzzles me, and was unable to find information neihter in the forum nor in the Wiki.
Since the NanoVNA outputs a rectagular signal which's harmonics are not neglectable and has no selective input (what I can see from the schematic is broadband), how can the S12 and S21 measurements be accurate as all the harmonics of the output will go into the mesurement at the input.
What do I have overseen?
Thanks for bringing me on the right track
Jens DF9HJ
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Transimission mesurements
Hello Guys,
I've one question which puzzles me, and was unable to find information neihter in the forum nor in the Wiki.
Since the NanoVNA outputs a rectagular signal which's harmonics are not neglectable and has no selective input (what I can see from the schematic is broadband), how can the S12 and S21 measurements be accurate as all the harmonics of the output will go into the mesurement at the input.
What do I have overseen?
Thanks for bringing me on the right track
Jens DF9HJ
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I see in NanoVNA-Saver screenshot frequency range 50-52MHz
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Earle D Wilkinson (6Y5EW) Home page: Email address: earle.wilkinson@... Echolink: 6Y5RA On Mon, Dec 20, 2021, 3:18 AM Earle Wilkinson <earle.wilkinson@...> wrote:
New at this.
I got myself an NanoVNA 2 version 4.
Everyone says best thing ever happened.
Better than sliced cheese.
My problem is that I a sticular when it comes to accuracy.
I would like to check my club stations duplexer accuracy on 147.960 high
pass filter with 147.360 as the split on the low pass filter, that is minus
600 kc split.
Now her is my problem I can only set my markers at 147.300 and 147.900.
Not the exact repeater frequency.
Will the difference of 60 hz make a difference in the accuracy of the
tuning insertion loss etc.
I realise that I need to be accurate at least with the 50 ohms impedance.
Thanks for your response.
Earle D Wilkinson
(6Y5EW)
Home page:
Email address: earle.wilkinson@...
Echolink: 6Y5RA
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Hi All!
I am now evaluating a 1:6 UNUN with NanoVNA that I bought quite recently. The UNUN is made of two stacked FT240-61 and 1.6mm copper wire with 100pF capacitor in the primary. To measure SWR, a 1800 ohm carbon resistor is soldered in the secondary side. To my surprise, SWR is 1.0 from 1.9MHz to 430MHz. I suspect I misunderstood how to measure SWR with NanoVNA. I am attaching the screen of NanoVNA Saver. Any comments are welcome. Thank you.
Henry JF1XCV
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After connectiin to PC, NanoVNA must see as additional COM port, you can check this in device manager.
If no additional ports in, check uncnown devices, and update drivers.
For USB connection baud rate not used (ignored)
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Larry,
Sorry to see that your post got hijacked and went off topic!
I want to than you for the work you did putting this DiSlord updates document together. Very interesting to see how the firmware has evolved.
Roger
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My document is NOT on that website. The owner of that website attempted to hijack my thread and drive views and probably advertising revenue for himself. On Sun., 19 Dec. 2021 at 4:34 p.m., Rick Murphy<k1mu.nospam@...> wrote: The language isn't changing because there is no English translation of this article on the site. The language choice menu "works" for content that has an English version, and doesn't when it doesn't exist. 73, ? ? -Rick On Sun, Dec 19, 2021 at 2:39 PM Donald S Brant Jr <dsbrantjr@...> wrote: Re:? language not changing, I have noticed some other sites where this is
happening, so there may be a more widespread issue.? Amazon Web Services
had an outage a week or so ago, and I noticed little things which were
broken a few days after; maybe it is happening again.
73, Don N2VGU
-- Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA
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Re: NanoVNA as a Signal Generator
On Sun, Dec 19, 2021 at 09:41 AM, Richard Groot wrote: So (newbie here) I've seen some versions of nanoVNA that capture 1000 data
points rather than 101. What are the consequences of the larger number of
points?
Disadvantage - with more points you get a slower sweep time. Advantages - - with more points the step size for a given frequency range is smaller so you get more plotting "definition". When measuring an antenna, for example, this will give a better estimate of the frequency with minimum SWR. - also you can "zoom in" (without recalibrating) and get better results if you have more data points. For example if you have 401 calibrated points over frequency range "A" and then zoom in by a factor of four to frequency range "B" 100 of the points will be close to what you get if you calibrate and measure over frequency range "B" with a 100 point sweep. Three interpolated points will be also available. Roger
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DisLord
excuse me for using your post. I need a clue why Nanovnasaver will not connect to usb port on my win 7 machine.
I have win-7 SP1 plus C++ and Net+ installed and I also ran the Cypress USB installer.
On the saver application no comm ports show up and typing in the allocated port number does nothing.
The QT version always connects OK.
I spotted your post re the app by one-of-eleven and downloaded that program. It connects ok too?
Checking the uSB port settings, the only difference between Nanovna saver and the above application is the baud rate?
So I am not sure what to do next, any ideas?
regards
joe
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Re: NanoVNA v1.1.00 fw pack for all H / H4 / LiteVNA / V2 / V2Plus / V2Plus4
#firmware
You not install 32768 quartz for rtc
If you not plane install it, remove battery, wait 10sec and put it back.
This reset lse mode to lsi
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The language isn't changing because there is no English translation of this article on the site. The language choice menu "works" for content that has an English version, and doesn't when it doesn't exist. 73, -Rick On Sun, Dec 19, 2021 at 2:39 PM Donald S Brant Jr <dsbrantjr@...> wrote: Re: language not changing, I have noticed some other sites where this is
happening, so there may be a more widespread issue. Amazon Web Services
had an outage a week or so ago, and I noticed little things which were
broken a few days after; maybe it is happening again.
73, Don N2VGU
-- Rick Murphy, D. Sc., CISSP-ISSAP, K1MU/4, Annandale VA USA
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Re: NanoVNA v1.1.00 fw pack for all H / H4 / LiteVNA / V2 / V2Plus / V2Plus4
#firmware
Hi
I have installed the latest version on my Nanovna H v3.2
Everything seems OK except that I can not save date and time.
In VERSION , time is 2000/01/01 00:00:30 (LSE) and I can not change it
Any idea?
Regards, Corneliu
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I can try understand source of problem. For this need:
Flash this debug firmware
Connect device to PC
Use NanoVNA-App (download from here )
Connect to device and open console (see image)
Try save on card on device
Copy log text and send it here
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Re: NanoVNA as a Signal Generator
Re: Number of points, I do not know of any downside except perhaps a slower sweep. There are software applications which will take control of the VNA and allow a 10,001 or greater point sweep.
Having said that for most uses 101 or 201 points is perfectly suitable; many commercial VNAs had similar numbers of points and were perfectly useable.
73, Don N2VGU
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Re: language not changing, I have noticed some other sites where this is happening, so there may be a more widespread issue. Amazon Web Services had an outage a week or so ago, and I noticed little things which were broken a few days after; maybe it is happening again.
73, Don N2VGU
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I have flashed the latest firmware for my H4 and that went well but I am still unable to save a trace to the SD card. I consistently get the "fail write" error message. Has anyone tried to save to their SD card and did it work? Rudy N6LF
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Hi Lawrence,
That's not my site.?
Gyula HA3HZ decided to hijack my thread to push his own outdated document, which has nothing to do with what I had posted (and very impolite, I might add).
It's his website and the translation has been broken for a while.?
On Sun., 19 Dec. 2021 at 10:36 a.m., Lawrance A. Schneider<llaassllaaass@...> wrote: Hi,
I just went to your site.? When I selected English, the language did not change.? I tried to reload and still (after selecting English) the language stayed the same.
Thank you,? ? larry
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Tim,
*DO NOT* include denigrating comments directed at other list members in your posts. They will get you put on moderation, or banned, very quickly.
DaveD, co-owner
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On Dec 19, 2021, at 12:21, Tim K4SHF <timothytapio1@...> wrote:
?If Chrome will do the translation, does it matter that that feature on the
site doesn't work? Or are you just whining because you have nothing better
to do with your life?
On Sun, Dec 19, 2021 at 11:45 AM Mike Willis <f1passenger@...> wrote:
I realize that, but using translate on Chrome doesn't fix the problem that
his page is broken.
Mike Willis
Register your consent or check if you are a registered Organ Donor at:
*beadonor.ca <>*
On Sun, Dec 19, 2021 at 11:19 AM Rob G8ZAX <rob.rees@...> wrote:
If you use chrome that will translate for you
Rob
On 19 Dec 2021, at 15:52, Mike Willis <f1passenger@...> wrote:
?Same here, Selecting English doesn't change things.
Mike Willis
Register your consent or check if you are a registered Organ Donor at:
*beadonor.ca <>*
On Sun, Dec 19, 2021 at 10:36 AM Lawrance A. Schneider <
llaassllaaass@...> wrote:
Hi,
I just went to your site. When I selected English, the language did not
change. I tried to reload and still (after selecting English) the
language
stayed the same.
Thank you, larry
|
Roger Need
Donald S Brant Jr