One last review on the SV4401A. Here is the bottom line as it is shipping currently: There is a problem with power-on with a fully changed battery and no external power connection. This has been corrected with a resistor change - easy to do without special tools if you can solder. In a lab environment, you'd never know it has a problem, keeping it plugged in. The PC app nanovna-saver does not work correctly, if it even connects to your Win10 PC at all. The app has very limited use. I find that taking a snapshot of the unit's screen and saving it as an image file is the best. Maybe they will improve this app, as it would be more convenient to operate it from the PC if you want to save sweep files. Being as large and heavy as it is, it is not a good instrument to take outside for antenna measurements, in my opinion. I love all the extra memory locations for special calibrations! One weakness that must be fixed somehow is the USB-C jack, which has no mechanical support. If not made stronger, the port is certain to fail, breaking a connection on the PCB. I plan to put a drop of hot glue at this connector, fixing it to the chassis, meanwhile being very careful to support the USB cable while charging or transferring files. I bought mine from Aliexpress for $299, normally about $399. Some ham radio suppliers are gouging everyone at $599! If you like the nanovna-F, you'll love this one, even with the improvements you need to make.But what is the USB-A connector good for? It is only a power source, but for what purpose?
|
Re: max save slots on the vna "h" version running hugens fw
For me github links return error.
I can't access any of the three links.
73.
toggle quoted message
Show quoted text
On Thu, Nov 17, 2022 at 06:04 AM, Ho-Ro wrote:
On Thu, Nov 17, 2022 at 09:23 AM, Paul M3VUV wrote:
does any fw exist with more save slots?
Yes: /g/nanovna-beta-test/topic/93905035
I've setup an easy workflow to follow DiSlord's development closely and create
the noSD versions with 8 config slots, available on my NanoVNA-noSD branch:
Get the binaries:
HTH, Martin
|
Just ignore it. Many issues with email, but usually not important. I get emails a month later sometimes. I get them quickly on my iPhone and then get the same ones days later on my iPad¡ go figure.
David J. Wilcox¡¯s iPad
toggle quoted message
Show quoted text
On Nov 16, 2022, at 10:48 AM, Max via groups.io <kg4pid@...> wrote:
? Have you had an email come in from groups.io a week or so later and since there was no quoting you have no clue what the question was really about? Like this one, the subject line says "Correct button? That doesn't tell me anything. But since I'm quoting you, you and everyone else knows exactly what post I referring to.
On Wednesday, November 16, 2022, 07:49:14 AM CST, Paul M3VUV <nanovnauser@...> wrote:
well , had this question as well but after reading thru this lot,it still doesent to anwer the original question,its harder to understand when ppl quote what been said already in the thread,just makes it a confusing mess to try and read!!.
|
Re: max save slots on the vna "h" version running hugens fw
On Thu, Nov 17, 2022 at 09:23 AM, Paul M3VUV wrote:
does any fw exist with more save slots?
Yes: /g/nanovna-beta-test/topic/93905035I've setup an easy workflow to follow DiSlord's development closely and create the noSD versions with 8 config slots, available on my NanoVNA-noSD branch: Get the binaries: HTH, Martin
|
max save slots on the vna "h" version running hugens fw
my vna has save slot zero and 123 max available,does any fw exist with more save slots?,it would be nice to do callibrations on more ham bands,not just 4 like i have now due to no save slots left.,73.
|
well well it seems we have more waffle and still the original question goes unanswered!( quote what does the correct button do).
|
"max may i suggest" NO YOU MAY NOT!? Do you always blow a fuse when you don't get what you want?Why would anyone answer you acting like that??
Good luck.
Max
toggle quoted message
Show quoted text
On Wednesday, November 16, 2022, 10:55:11 AM CST, Paul M3VUV <nanovnauser@...> wrote:
max may i suggest unless you are going to answe the original question keep your mouth shut and hands away from the keyboard,seems you can do neither!.
|
Ironically I have no idea who this is directed at or even what the original question was due to lack of message quoting. Not that I care, I just got a good chuckle out of it.... 73 -Jim NU0C On Wed, 16 Nov 2022 08:54:59 -0800 "Paul M3VUV " <nanovnauser@...> wrote: max may i suggest unless you are going to answe the original question keep your mouth shut and hands away from the keyboard,seems you can do neither!.
|
Stephen
Thank you very much for this reply.? That needed to be said.? Well done.
Don KC1MPO
toggle quoted message
Show quoted text
On 11/16/2022 12:21 PM, Stephen W9SK wrote: Paul, aren't we easily triggered by nothing? That was pretty rude. I have to agree with Max that when someone posts a reply without the prior comment it makes too hard to follow the request for help, thereby eliminating what could be solutions from experts who are too busy to otherwise take the extra time to figure out what the reply topic is about. You may have that time, but then you may not have the best solution to offer, which is at best may leave the other folks without that solution they're looking for. Try to be more understanding...and polite here.
Stephen W9SK
-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Paul M3VUV
Sent: Wednesday, November 16, 2022 8:55 AM
To: [email protected]
Subject: Re: [nanovna-users] Correct button?
max may i suggest unless you are going to answe the original question keep your mouth shut and hands away from the keyboard,seems you can do neither!.
|
Paul, aren't we easily triggered by nothing? That was pretty rude. I have to agree with Max that when someone posts a reply without the prior comment it makes too hard to follow the request for help, thereby eliminating what could be solutions from experts who are too busy to otherwise take the extra time to figure out what the reply topic is about. You may have that time, but then you may not have the best solution to offer, which is at best may leave the other folks without that solution they're looking for. Try to be more understanding...and polite here.
Stephen W9SK
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] < [email protected]> On Behalf Of Paul M3VUV Sent: Wednesday, November 16, 2022 8:55 AM To: [email protected]Subject: Re: [nanovna-users] Correct button? max may i suggest unless you are going to answe the original question keep your mouth shut and hands away from the keyboard,seems you can do neither!.
|
I would agree that being able to use a "externally measured" cal standard data file (.s1p or .s2p) would be the preferred approach, and is supported in, e.g. nanovna-saver.
Whether you'd want to do that *in* the NanoVNA itself is really more about space available, time required for implementation, testing, etc.
I'm pretty happy with the "box" as a sensor with basic functionality and the assumption of ideal standards - it gets me to within a few percent. If I need better, I'd rather have that in an external system with a lot more resources.
When looking at what I'd want firmware developers to look at, it's things "internal to the box" - improved sampling, filtering, etc. - those are things that cannot be done in an external device. Some are hardware wishes (easier to bring the reference receiver input out, so I can use an external bridge. More flexibility with signal levels.
But more sophisticated calibration seems something that is better pushed to a post processing or application. That's what I've done for years with other VNAs and similar equipment. I can have an infinite number of calibration schemes on a pc, manipulate them to my own needs, etc.
|
max may i suggest unless you are going to answe the original question keep your mouth shut and hands away from the keyboard,seems you can do neither!.
|
Have you had an email come in from groups.io a week or so later and since there was no quoting you have no clue what the question was really about? Like this one, the subject line says "Correct button? That doesn't tell me anything. But since I'm quoting you, you and everyone else knows exactly what post I referring to.
toggle quoted message
Show quoted text
On Wednesday, November 16, 2022, 07:49:14 AM CST, Paul M3VUV <nanovnauser@...> wrote:
well , had this question as well but after reading thru this lot,it still doesent to anwer the original question,its harder to understand when ppl quote what been said already in the thread,just makes it a confusing mess to try and read!!.
|
well , had this question as well but after reading thru this lot,it still doesent to anwer the original question,its harder to understand when ppl quote what been said already in the thread,just makes it a confusing mess to try and read!!.
|
I just had the same problem a couple of days ago. A web search found a statement that at least some phones with USB-C connectors still need the OTG adapter. I went back to using an older phone with the Micro-USB connector, and an OTG adapter.
I could not get the newer Moto G6 (USB C) to work with the NanoVNA.
--
Doug, K8RFT
|
Hi all i have an old version H vna,its running hugens 555 firmware,just wondered the max number of save slots it has,just wondered if i can cal it too all the hf and vhf amature bands excert 6+ 4 mtrs?,TIA.
|
Re: Nano VNA BASIC WORKSHOP via Zoom
Good morning Barry
super.... unfortunately I have missed the three sessions ,and this is not recorded I would be happy to share your 200 slides and ask questions . I have experiment with VNA an anything related. I am a retired engineer and would welcome to share some of the presentation from university of liege ( this is in Belgium)
I believe this is in English must check.
again this is a super idea, how do we link with soon the conference and what is the difference in time between your location and Belgium ?
de ONL11812 Pierre
Nov 16th
|
On 11/15/22 12:06 PM, Stan Dye wrote: And you also need to know that the measurement is not exact: you will only
get within several percent of the cable length at best. This is due to the
way the nanovna (or host software) does the TDR measurement. The nanovna
measures at discrete frequencies using its frequency scan, then the
software takes those points and calculates an FFT to change to the time
domain. This inherently uses a 'bin' size, which limits the granularity of
the measurement. You can see this granularity as you step across the TDR
graph - each calculated point is separated by this minimum granularity.
Rather than TDR - (where the resolution is c/(frequency step size)) I'd suggest just measuring phase at your frequency of interest - You can directly display phase vs frequency, set a marker or two, and go to town. In any of the PC tools, you can put a reference trace up of one of the cables as you measure and cut the other. Then you don't have any issues with interpolation between bins in the FFT.
|
Re: Nano VNA BASIC WORKSHOP via Zoom
Barry,
I enjoyed your talk yesterday evening ..
Next Monday at 7PM is fine with me¡
Should I use the same zoom invite?
Tnx & 73s
Doug KD4NC
Kennesaw, Ga
|
Yes, open or shorted gives equivalent measurements (one is phase-reversed
from the other).
And terminated in the characteristic impedance of the cable will give an
'infinite' measurement (no reflection).
How to adapt to other cables? You can do other cables the same way, even if
they are balanced or not of 50-ohm impedance. You do need to know the
velocity factor.
And you also need to know that the measurement is not exact: you will only
get within several percent of the cable length at best. This is due to the
way the nanovna (or host software) does the TDR measurement. The nanovna
measures at discrete frequencies using its frequency scan, then the
software takes those points and calculates an FFT to change to the time
domain. This inherently uses a 'bin' size, which limits the granularity of
the measurement. You can see this granularity as you step across the TDR
graph - each calculated point is separated by this minimum granularity.
If your vna firmware has the "Measure / Cable" option in the menu, it is
better to use if you want to find the length of the cable (or the distance
to a break, if you have seen one in the TDR). It still is only as accurate
as your estimate of the cable velocity factor, but is accurately measured
(it uses a different technique without any binning effect/uncertainty).
The Measure Cable function will also show the characteristic impedance of
the cable, and the loss in dB along the length of the cable.
toggle quoted message
Show quoted text
On Tue, Nov 15, 2022 at 12:26 AM tuckvk3cca <tuckvk3cca@...> wrote: Great, thanks. So you get the same results if the end is either open or
shorted right? Reverse the cable and you can confirm where the break is.
With a dummy load the cable length should read very large with no kinks
right?
How do I adapt this to other cables? Do I need a balun?
|
Igor - PY3IG
David Wilcox K8WPE
Ho-Ro
Jim Shorney
Stephen W9SK