Thanks Dave!
Joe WB9SBD /W9ET
toggle quoted message
Show quoted text
On 2/20/2022 2:05 PM, W0LEV wrote: You don't "need" the bottom of the chart which is -j50. Read your value
midband on the measured curve at 3.750 MHz (not critical).
Extreme right on the Smith Chart is an open while the extreme left is a
short - both on the horizontal line.
Dave - W?LEV
On Sun, Feb 20, 2022 at 7:48 PM Joe WB9SBD<nss@...> wrote:
oK,
UST TRIED WITH A STIMULUS SPAN OF 3.5 TO 4 MEG.
Oops cap lock, anyway.
The smith chart curve starts at the far right, short? or open? UG memory
again,,,
anyway the curve starts at the far right, but only curves down to say
the 4 to 5 o clock position it doesn't get to the bottom of the display.
so Now what?
Joe WB9SBD / W9ET
On 2/20/2022 12:20 PM, W0LEV wrote:
It's best to measure the capacitor at the frequency of interest, especially
as that frequency increases. For a "sticker value", use a low frequency -
1 MHz or less. As the frequency increases, parasitic inductance becomes
more and more evident which cancels some of the effective capacitance.
Dave - W?LEV
On Sun, Feb 20, 2022 at 2:52 PM Joe WB9SBD<nss@...> wrote:
What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5
and 4 Mhz.
Should I set the stimulus rage for those values?
And the measurement should be taken when the smith chart tracer thing is
right at the bottom like 6 O'clock position correct?
Joe WB9SBD / W9ET
|
You don't "need" the bottom of the chart which is -j50. Read your value
midband on the measured curve at 3.750 MHz (not critical).
Extreme right on the Smith Chart is an open while the extreme left is a
short - both on the horizontal line.
Dave - W?LEV
toggle quoted message
Show quoted text
On Sun, Feb 20, 2022 at 7:48 PM Joe WB9SBD <nss@...> wrote: oK,
UST TRIED WITH A STIMULUS SPAN OF 3.5 TO 4 MEG.
Oops cap lock, anyway.
The smith chart curve starts at the far right, short? or open? UG memory
again,,,
anyway the curve starts at the far right, but only curves down to say
the 4 to 5 o clock position it doesn't get to the bottom of the display.
so Now what?
Joe WB9SBD / W9ET
On 2/20/2022 12:20 PM, W0LEV wrote:
It's best to measure the capacitor at the frequency of interest, especially
as that frequency increases. For a "sticker value", use a low frequency -
1 MHz or less. As the frequency increases, parasitic inductance becomes
more and more evident which cancels some of the effective capacitance.
Dave - W?LEV
On Sun, Feb 20, 2022 at 2:52 PM Joe WB9SBD<nss@...> wrote:
What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5
and 4 Mhz.
Should I set the stimulus rage for those values?
And the measurement should be taken when the smith chart tracer thing is
right at the bottom like 6 O'clock position correct?
Joe WB9SBD / W9ET
--
*Dave - W?LEV*
*Just Let Darwin Work*
|
Re: NanoSaver on ubuntu- mint
No, if I plug the USB cable from the NanoVNA to the PC and push the icon to open the NanoSaver software, NOT open up. If I unplug the USB cable the NanoSaver open up, I select SCAN Refresh and NOT see the NanoVNA serial port. *Sent:* Sunday, February 20, 2022 at 6:16 PM *From:* "Dragan Milivojevic" <d.milivojevic@...> *To:* [email protected]*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint I'm sorry, I do not understand what you are trying to say. You expect for NanoVNASaver to start on its own when you plug in the NanoVNA?
On Sun, 20 Feb 2022 at 11:37, Francesco <realfran@...> wrote: Yes, I install libreVNA with is on software and work, I cheek on
Mint/Ubuntu and give me the list of usb ports, I plug the NanoVNA and give
me the Cypress USB driver is installed, *I give more detall* : when I plug
the USB cable from the NanoVNA the Saver software not open, when I unplug
the cable open up, the problem is NanoSaver software don't open the USB
port.
I tray to put this information on the terminal but not result.
One other information I never use software terminal on my life.
Thank you for the help the only think I doing is "copy and past on the
terminal".
Best regards.
Francesco.
*Sent:* Sunday, February 20, 2022 at 3:39 AM
*From:* "Dragan Milivojevic" <d.milivojevic@...>
*To:* [email protected]
*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
AFAIK Saver does not support LibreVNA
On Sat, 19 Feb 2022 at 10:24, Francesco <realfran@...> wrote:
Hello, I install LibreVNA and work, I use the USB port for different
device and work, the only problem is NanoVNA-Saver is installed but not
find the the serial/usb device.
*Sent:* Saturday, February 19, 2022 at 4:36 AM
*From:* "Dragan Milivojevic" <d.milivojevic@...>
*To:* [email protected]
*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
On Sat, 19 Feb 2022 at 01:22, Francesco <realfran@...> wrote:
Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA
Saver I don't find the "device port" get a problem with the LiteVNA and the
NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use
Linux (I'm lost) I install a lot of Python libraries and I get confused
with the " CONSOLE "
|
Even easier, there's a command line way to get to any of the NanoVNA flavors, using NanoVNA-Saver. See this post from the nanovnav2 list: /g/NanoVNAV2/message/3001Many thanks Jim This is precisely what I was looking for. Additionally I found a purpose built Python script by Kevin O'Brien which offers a command line interface --- works when placed in the NanoVNA directory. Thanks again. Dylan.
|
oK,
UST TRIED WITH A STIMULUS SPAN OF 3.5 TO 4 MEG.
Oops cap lock, anyway.
The smith chart curve starts at the far right, short? or open? UG memory again,,,
anyway the curve starts at the far right, but only curves down to say the 4 to 5 o clock position it doesn't get to the bottom of the display.
so Now what?
Joe WB9SBD / W9ET
toggle quoted message
Show quoted text
On 2/20/2022 12:20 PM, W0LEV wrote: It's best to measure the capacitor at the frequency of interest, especially
as that frequency increases. For a "sticker value", use a low frequency -
1 MHz or less. As the frequency increases, parasitic inductance becomes
more and more evident which cancels some of the effective capacitance.
Dave - W?LEV
On Sun, Feb 20, 2022 at 2:52 PM Joe WB9SBD<nss@...> wrote:
What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5
and 4 Mhz.
Should I set the stimulus rage for those values?
And the measurement should be taken when the smith chart tracer thing is
right at the bottom like 6 O'clock position correct?
Joe WB9SBD / W9ET
|
Re: Proper way to measure length of _Window_Line_?
On 2/20/22 10:20 AM, Roger Need via groups.io wrote: On Sun, Feb 20, 2022 at 07:01 AM, Jim Lux wrote:
- Or, you can mathematically transform measurements made assuming 50
ohms into measurements using some other impedance. The NanoVNA won't do
this, but other software can.
Jim - DiSlord has added the capability to change the system impedance for measurements in his recent firmware. It is under the Display menu..
Roger Then hook that twinlead up directly and go for it. That's pretty cool. I thought I had some 300 ohm twinlead in the garage, and I was going to do some tests with transformer and not, etc.? But I didn't, so it will have to wait for the next trip the to store.
|
You're not the only one. Oh wait, what were we talking about?
Max
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Show quoted text
On Sunday, February 20, 2022, 01:13:22 PM CST, Joe WB9SBD <nss@...> wrote:
I am sorry that I asked that question again.
I'm Old, The Brain is failing.
I am lucky when i go to the basement to get a tool, to be able to remember what tool I went down there to get.
Sorry,
Joe WB9SBD / W9ET
|
I am sorry that I asked that question again.
I'm Old, The Brain is failing.
I am lucky when i go to the basement to get a tool, to be able to remember what tool I went down there to get.
Sorry,
Joe WB9SBD / W9ET
|
On Sun, Feb 20, 2022 at 06:52 AM, Joe WB9SBD wrote:
What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5
and 4 Mhz.
Here is a previous post where I show how to measure a 365 pF cap in this frequency range.... /g/nanovna-users/message/25725This post was a response to this post >> /g/nanovna-users/topic/87236912#25714Roger
|
On Sun, Feb 20, 2022 at 07:55 AM, Larry Rothman wrote: The version 2 and newer Nanovnas use a binary command structure. I do not
think there is a document for them yet so you will have to go through the
open-source firmware to see those.?
Larry - The SAA2 binary protocol is described in this document.... Roger
|
It's best to measure the capacitor at the frequency of interest, especially
as that frequency increases. For a "sticker value", use a low frequency -
1 MHz or less. As the frequency increases, parasitic inductance becomes
more and more evident which cancels some of the effective capacitance.
Dave - W?LEV
toggle quoted message
Show quoted text
On Sun, Feb 20, 2022 at 2:52 PM Joe WB9SBD <nss@...> wrote: What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5
and 4 Mhz.
Should I set the stimulus rage for those values?
And the measurement should be taken when the smith chart tracer thing is
right at the bottom like 6 O'clock position correct?
Joe WB9SBD / W9ET
--
*Dave - W?LEV*
*Just Let Darwin Work*
|
Re: Proper way to measure length of _Window_Line_?
On Sun, Feb 20, 2022 at 07:01 AM, Jim Lux wrote: - Or, you can mathematically transform measurements made assuming 50
ohms into measurements using some other impedance. The NanoVNA won't do
this, but other software can.
Jim - DiSlord has added the capability to change the system impedance for measurements in his recent firmware. It is under the Display menu.. Roger
|
Re: NanoSaver on ubuntu- mint
I'm sorry, I do not understand what you are trying to say.
You expect for NanoVNASaver to start on its own when you
plug in the NanoVNA?
toggle quoted message
Show quoted text
On Sun, 20 Feb 2022 at 11:37, Francesco <realfran@...> wrote: Yes, I install libreVNA with is on software and work, I cheek on
Mint/Ubuntu and give me the list of usb ports, I plug the NanoVNA and give
me the Cypress USB driver is installed, *I give more detall* : when I plug
the USB cable from the NanoVNA the Saver software not open, when I unplug
the cable open up, the problem is NanoSaver software don't open the USB
port.
I tray to put this information on the terminal but not result.
One other information I never use software terminal on my life.
Thank you for the help the only think I doing is "copy and past on the
terminal".
Best regards.
Francesco.
*Sent:* Sunday, February 20, 2022 at 3:39 AM
*From:* "Dragan Milivojevic" <d.milivojevic@...>
*To:* [email protected]
*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
AFAIK Saver does not support LibreVNA
On Sat, 19 Feb 2022 at 10:24, Francesco <realfran@...> wrote:
Hello, I install LibreVNA and work, I use the USB port for different
device and work, the only problem is NanoVNA-Saver is installed but not
find the the serial/usb device.
*Sent:* Saturday, February 19, 2022 at 4:36 AM
*From:* "Dragan Milivojevic" <d.milivojevic@...>
*To:* [email protected]
*Subject:* Re: [nanovna-users] NanoSaver on ubuntu- mint
On Sat, 19 Feb 2022 at 01:22, Francesco <realfran@...> wrote:
Hello, I set up one laptop with Mint Linux "cinnamon" I install NanoVNA
Saver I don't find the "device port" get a problem with the LiteVNA and the
NanoVNA V2 plus4.
Please some help, I'm computer illiterate and this is the first time I use
Linux (I'm lost) I install a lot of Python libraries and I get confused
with the " CONSOLE "
|
If you're new to the Nanovna, please read the beginners guide in the files section. There are other reference guides there too.?
I wrote a? console command guide that explains all the serial (usb) command structures. It has not been updated in 2 years but covers most commands. It has been used by a number of developers to create apps that interface with the Nanovna.?
The version 2 and newer Nanovnas use a binary command structure. I do not think there is a document for them yet so you will have to go through the open-source firmware to see those.?
On Sun., 20 Feb. 2022 at 8:16 a.m., zahi666@...<zahi666@...> wrote: Hi,
I'm new to nanovna, I want to use it to get the return loss.
How can I get it? I'm using c# and rs232 communication.
Thanks,
Zahi
|
Re: Proper way to measure length of _Window_Line_?
On 2/20/22 6:43 AM, WB2UAQ wrote: Do I understand this correctly from this discussion? For every Zo a balun or transformer is required for that specific Zo? One for 100 ohm cat 5, one for 300 ohm TV twin lead, another for 600 ohm ladder line and another for 450 ohm window line, etc.?
Not really - there's two aspects to this: 1) Different characteristic impedance - You could calibrate with 300 ohm load, short, and open and directly measure 300 ohm lines (or 75 ohm lines, etc.)? The S parameters will be correct, but anything which turns that into Z won't necessarily be right (because the formula needs the calibration impedance. - Or, you can mathematically transform measurements made assuming 50 ohms into measurements using some other impedance. The NanoVNA won't do this, but other software can. 2) Balanced to unbalanced transformation - This is more about "how accurate do you want to be?" The NanoVNA is a unbalanced system, but it's also tiny. It's also (in usual situations) not "connected to ground" so the unbalance shouldn't affect much (i.e. it's a two terminal device, the balanced transmission line is a two terminal device, there's no way to "know" that it's not balanced)
|
Re: Unit Won't turn on after charging
OK, I will try this. Thanks for all your help.
|
What is a typical stimulus range for measuring a Cap?
If it makes any difference it is a 500pf cap, and is used between 3.5 and 4 Mhz.
Should I set the stimulus rage for those values?
And the measurement should be taken when the smith chart tracer thing is right at the bottom like 6 O'clock position correct?
Joe WB9SBD / W9ET
|
Re: Proper way to measure length of _Window_Line_?
Do I understand this correctly from this discussion? For every Zo a balun or transformer is required for that specific Zo? One for 100 ohm cat 5, one for 300 ohm TV twin lead, another for 600 ohm ladder line and another for 450 ohm window line, etc.?
|
Re: New H4 User and PC Software Question
On Sun, Feb 20, 2022 at 08:47 AM, Donald S Brant Jr wrote:
I still have my laminated Smith Chart that you can draw on with grease pencil
or erasable marker. I also have a copy of Smith's book, bought from Smith
himself.
With that, my Dietzgen slide rule, my grid dip meter, and my copies of "Radio
Engineering" and "Radio Engineer's Handbook" by Terman I am ready for The Big
One.
My copy of "Electronic Applications of the Smith Chart" is from the re-publisher Krieger (they're in town, so it was new, but "damaged" surplus), my Terman is third edition, and my Smith charts are an inch thick stack of paper blanks (the red and green version) from when the company I was working for was going to throw them in the dumpster. My slide rule is a version made by Collins Radio Company that I picked up at a hamfest maybe 20 years before I went to work for them. ___________ Bob - W4ATM -? 35 miles south of the Kennedy Space Center Retired RF Engineer now playing with all the hobbies I never had the time for.
|
Re: New H4 User and PC Software Question
Sounds like we¡¯re from the same era! Gene K1AVE (1956) From: Donald S Brant Jr<mailto:dsbrantjr@...> Sent: Sunday, February 20, 2022 8:47 AM To: [email protected]<mailto: [email protected]> Subject: Re: [nanovna-users] New H4 User and PC Software Question I still have my laminated Smith Chart that you can draw on with grease pencil or erasable marker. I also have a copy of Smith's book, bought from Smith himself. With that, my Dietzgen slide rule, my grid dip meter, and my copies of "Radio Engineering" and "Radio Engineer's Handbook" by Terman I am ready for The Big One. 73, Don N2VGU
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Francesco
Roger Need