Hi Chris
the screen shots show the correct driver and the correct hex in the uart, plus the QT version using the same set up always connects as does the app from 1 of 11. This tends to make me think it is an app problem.
Interestingly, if you view the screen output of the ini file, entering a non existent port number results in an immediate error message, however entering the allocated port number shows nothing, program just hangs and a second attempt to connect to the port crashes program.
joe
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On 21/12/2021 10:10, Chris Gardner via groups.io wrote: I had something similar happen... Once windows decides the type of device (right or wrong), it assigns a driver. Often, when you try to load the correct driver, windows will insist it already has the "best" driver.
Perhaps the Nano had been connected, before the required driver was loaded first, that can cause windows to load the incorrect driver.
I used a program called Zadig Available here ===> Select show all devices, find the one in question, then load the generic usb driver
Next load the correct ST Microdevices driver.
|
I had something similar happen... Once windows decides the type of device (right or wrong), it assigns a driver. Often, when you try to load the correct driver, windows will insist it already has the "best" driver.
Perhaps the Nano had been connected, before the required driver was loaded first, that can cause windows to load the incorrect driver.
I used a program called Zadig Available here ===>
Select show all devices, find the one in question, then load the generic usb driver
Next load the correct ST Microdevices driver.
|
Further
the COM3 port allocated when nano is connected details show as ports\VID\04B4&PID_008
joe
|
Using device manager and connecting the vna unit aUSB to Uart adapter shows up
usb\vid_04B4&PID_0008&REV_001
usb\vid_04B4&pid_008
is this what you mean?
|
Think of it in golfing terms. It's like trying to putt with a 'mashie'. (personally I prefer a #2 wood to putt)
Mike C.
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On 12/20/2021 1:48 PM, Dave Daniel wrote: Remember, the difference between ¡°accuracy¡± and ¡°precision¡± is important.
Accuracy has to do with the degree to which an instrument can determine a measured value compared to the actual value, independent of the method of measurement.
Precision is the degree to which an instrument can display the actual value.
For precision, think about measuring a length; does the scale read in 10ths of an inch, 100ths of an inch? And how accurate are those markings on the scale?
DaveD
On Dec 20, 2021, at 13:18, Earle Wilkinson <earle.wilkinson@...> wrote:
?Thanks for the response will let you know the outcome
Earle D Wilkinson
(6Y5EW)
Home page:
Email address: earle.wilkinson@...
Echolink: 6Y5RA
On Mon, Dec 20, 2021, 10:21 AM Jim Lux <jim@...> wrote:
On 12/20/21 12:27 AM, Earle Wilkinson wrote:
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
Two issues that arise:
#1 The NanoVNA only has a limited number of frequency steps
(101,201,401, depending on which firmware and model) unless you're using
software on an external computer that does multiple scans. So, if you
set your span to, say, 147 to 148 MHz, then you'll get a measurement
every 10 kHz (with 101 points). Solution here is to use one of the many
software packages that will talk to the NanoVNA and make multiple scans
and combine them.
#2 The 28 MHz oscillator in the NanoVNA isn't necessarily accurate
enough. I don't recall the spec, but let's say it's on the order of 10
ppm (good for a TCXO) - at 147 MHz, that means it could be off by 1470 Hz.
|
Re: Transimission mesurements
Lighten up, I'm an old F*** but names don't bother me. I'm just P when somebody steals my marbles. :0)
Mike C.
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On 12/20/2021 12:34 PM, Charles Young wrote: Robin:
Rather insensitive terminology here!
"1) there is the odd Doll on this group as well as [far too many, /pro rata/] Guys¡±
Chuck Young
On Dec 20, 2021, at 6:56 AM, G8DQX list <list@...> wrote:
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.
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
|
NanoVNA Saver search for this USB devices
USBDevice(0x0483, 0x5740, "NanoVNA"),
USBDevice(0x16c0, 0x0483, "AVNA"),
USBDevice(0x04b4, 0x0008, "S-A-A-2"),
you can see this in device id (details):
Ports\VID_04B4&PID_0008
Check it for your device
|
Upon checking the link to ST driver is version I already loaded.
I double checked the addition of USB port when nanovna connected.
this is before connection
and this is after connecting nanovna
|
You say wrong port, but same port number works with QT version and app from one-of-eleven? same driver.
I just grabbed st driver from web and installing now
cheers
joe
|
Anyway you use wrong Port (this for USB to TTL dongle) Find USB Serial Port from CypressSerial
|
My nano vna states SAA-2N,? HW version V2_2?? manufactured by Zeenko
if you need other information please state where to find it
joe
|
Just for understand - you mean NanoVNA-H or H4 ??
Not V2 model?
My last post for NanoVNA-H or H4
|
I see CDC to USART adapter - this not NanoVNA port NanoVNA port must have name STMicroelectronics Virtual COM Port Driver:
|
Hi DisLord, thanks for coming back to my shout for help
I installed the nanovna-save on win10 no problem, but I wanted to use an older laptop using win7 and that will not connect to the allocated USB port at all. Even typing the port number into the saver port box does not work.
Running the QT version on the same machine connects every time! and also running the app by one-of-eleven connects every time.
Anyone any ideas?
Using Dell latitude laptop with Win 7 & SP1
I also loaded up the .net framework and VBS just to cross that off the list.
I installed the Cypress driver from the? installer
Plugging in the vna and checking com ports i get
USBD Views
After connection attempt has failed this message is added to ini file
The .ini file has no file call? so I am left asking the forum for ideas
my nano save is ver 0.2.2.1
Regards
joe
|
Remember, the difference between ¡°accuracy¡± and ¡°precision¡± is important.
Accuracy has to do with the degree to which an instrument can determine a measured value compared to the actual value, independent of the method of measurement.
Precision is the degree to which an instrument can display the actual value.
For precision, think about measuring a length; does the scale read in 10ths of an inch, 100ths of an inch? And how accurate are those markings on the scale?
DaveD
toggle quoted message
Show quoted text
On Dec 20, 2021, at 13:18, Earle Wilkinson <earle.wilkinson@...> wrote:
?Thanks for the response will let you know the outcome
Earle D Wilkinson
(6Y5EW)
Home page:
Email address: earle.wilkinson@...
Echolink: 6Y5RA
On Mon, Dec 20, 2021, 10:21 AM Jim Lux <jim@...> wrote:
On 12/20/21 12:27 AM, Earle Wilkinson wrote:
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
Two issues that arise:
#1 The NanoVNA only has a limited number of frequency steps
(101,201,401, depending on which firmware and model) unless you're using
software on an external computer that does multiple scans. So, if you
set your span to, say, 147 to 148 MHz, then you'll get a measurement
every 10 kHz (with 101 points). Solution here is to use one of the many
software packages that will talk to the NanoVNA and make multiple scans
and combine them.
#2 The 28 MHz oscillator in the NanoVNA isn't necessarily accurate
enough. I don't recall the spec, but let's say it's on the order of 10
ppm (good for a TCXO) - at 147 MHz, that means it could be off by 1470 Hz.
|
On Mon, Dec 20, 2021 at 09:50 AM, Bo W4GHV wrote:
I just obtained mine, so forgive my lack of knowledge.
I thought it only had 100 data points? How do you scan a wide range?
But, I just read you can do this if it is connected to a PC using the
software.
Bo W4GHV since '54
I suggest you read the Absolute Beginners Guide in the Files section of this group. Also check out the group Wiki. Roger
|
Re: Transimission mesurements
Thanks Robin,
vy 73 Jens
Am 20.12.2021 um 12:56 schrieb G8DQX list:
toggle quoted message
Show quoted text
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.
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
|
Thanks for the response will let you know the outcome
Earle D Wilkinson
(6Y5EW)
Home page:
Email address: earle.wilkinson@...
Echolink: 6Y5RA
toggle quoted message
Show quoted text
On Mon, Dec 20, 2021, 10:21 AM Jim Lux <jim@...> wrote: On 12/20/21 12:27 AM, Earle Wilkinson wrote:
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
Two issues that arise:
#1 The NanoVNA only has a limited number of frequency steps
(101,201,401, depending on which firmware and model) unless you're using
software on an external computer that does multiple scans. So, if you
set your span to, say, 147 to 148 MHz, then you'll get a measurement
every 10 kHz (with 101 points). Solution here is to use one of the many
software packages that will talk to the NanoVNA and make multiple scans
and combine them.
#2 The 28 MHz oscillator in the NanoVNA isn't necessarily accurate
enough. I don't recall the spec, but let's say it's on the order of 10
ppm (good for a TCXO) - at 147 MHz, that means it could be off by 1470 Hz.
|
I just obtained mine, so forgive my lack of knowledge.
I thought it only had 100 data points? How do you scan a wide range?
But, I just read you can do this if it is connected to a PC using the software.
Bo W4GHV since '54
|
Re: Transimission mesurements
Robin:
Rather insensitive terminology here!
"1) there is the odd Doll on this group as well as [far too many, /pro rata/] Guys¡±
Chuck Young
toggle quoted message
Show quoted text
On Dec 20, 2021, at 6:56 AM, G8DQX list <list@...> wrote:
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.
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
|
Mike C.
Roger Need
Bo W4GHV