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Re: Testing Cables #cables

 

The source is channel 01. The 'sink' or receiver is channel 01.

If you do a through measurement as you describe between channel 00 and
channel 01, compare the measured loss against the published loss figures
for your specific cable. A good source of that data can be accessed at:



Dave - W?LEV

On Mon, Apr 5, 2021 at 9:04 PM David Ackrill <david.ackrill@...>
wrote:

Now that I've got the NanoVNA working, with lots of help from other
people, I'd like to move on to actually using the unit.

I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.

Mainly VHF and UHF, but if they prove to be poor at 50MHz and above, what
they look like below about 30MHz.

So, I guess the input to the cable will be socket CH1 and the output CH0,
but what should I be looking for at the output of a 'good', 'bad' or 'OK
cable at any frequency?

I get that I will need to re-calibrate the system for various frequency
bands, given the 101 data points, I'll take that onboard when I start
checking the cable.

Thanks - Dave (G0DJA)





--
*Dave - W?LEV*
*Just Let Darwin Work*
Re: I AM NEW TO THIS BUT HAVE A KEEN INTEREST HAVING BORROWED ONE FRON A FRIEND, NOW I WANT TO GET ONE, I HAVE LOOKED ON AMAZON.CA AND SEE AN SAA-N2 FROM HKCNMA.COM FOR 129.00 CAN. It has N type connectors a plus as I find the smaller load etc almost too small to work with, anyone know if this unit works well or any pit falls also what is the warning about damage to the unit about,if you don"t cal after power up. Any comments on this unit, on the surface ot looks good, maybe too good...I hope I'm wrong,thanks

 

Yes, please keep the subject concise and the rest of your post in the body of the post, not in the subject, just like in email.

Thanks!!!

Donald -- AD8DY
Formerly KJ3I
Re: Testing Cables #cables

 

David, please remember that for many contributors on this site, English may not be their first language. A quick look at the callsign will show which country they are in.

On 05/04/2021 22:37, David Ackrill wrote:
Aghh... Please - Velocity, not velosity...

I'm sorry, but typos really get to me.

People who put mHz instead of MHz, or MHZ, instead of MHz.

Please, please, check for typos in your webpages, it is not difficult...

On Mon, 5 Apr 2021 at 22:20, <reuterr@...> wrote:

On Mon, Apr 5, 2021 at 11:04 PM, David Ackrill wrote:
I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.
Hello David,

For checking the coax cable impedance I have made a description, see:


73, Rudi DL5FA
Re: Testing Cables #cables

 

Do you speak German as well as he speaks English?

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Ackrill
Sent: Monday, April 5, 2021 5:38 PM
To: [email protected]
Subject: Re: [nanovna-users] Testing Cables #cables

Aghh... Please - Velocity, not velosity...

I'm sorry, but typos really get to me.

People who put mHz instead of MHz, or MHZ, instead of MHz.

Please, please, check for typos in your webpages, it is not difficult...

On Mon, 5 Apr 2021 at 22:20, <reuterr@...> wrote:

On Mon, Apr 5, 2021 at 11:04 PM, David Ackrill wrote:

I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.
Hello David,

For checking the coax cable impedance I have made a description, see:


73, Rudi DL5FA





--
David Ackrill
Re: Testing Cables #cables

David Ackrill
 

Aghh... Please - Velocity, not velosity...

I'm sorry, but typos really get to me.

People who put mHz instead of MHz, or MHZ, instead of MHz.

Please, please, check for typos in your webpages, it is not difficult...

On Mon, 5 Apr 2021 at 22:20, <reuterr@...> wrote:

On Mon, Apr 5, 2021 at 11:04 PM, David Ackrill wrote:

I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.
Hello David,

For checking the coax cable impedance I have made a description, see:


73, Rudi DL5FA





--
David Ackrill
Re: SAA-2N From R&L

 

Hello Rudi!

Thank you very much!
I am about to test.
**
Result:
It works, but the NanoVNA-APP program goes to dusconnect after a short time. Then Windows 10 came up with a message about problem with ntdll.dll. When you close the screen shot window, the program goes to disconnect. Still, it's a step forward

73 de Vladimir, DL7PGA
P.S. Ich schreibe lieber auf Deutsch.

05.04.2021, 23:00, "reuterr@..." <reuterr@...>:




On Sun, Apr 4, 2021 at 12:41 PM, Vladimir Lebedev wrote:



FW from ojisancoubou works very good, but you can not become the screen
capture in program NanoVNA-APP.


Hello Vladimir,

I have added the *screen capture* function to the nanoVNA V2 version of
the ojisan firmware, see:


I have also translated his last information about his firmware to English.


73, Rudi DL5FA
Re: Testing Cables #cables

David Ackrill
 

Thank you for that, I can read through that and sort out what I want to do.

Cheers - Dave (G0DJA)

On Mon, 5 Apr 2021 at 22:20, <reuterr@...> wrote:

On Mon, Apr 5, 2021 at 11:04 PM, David Ackrill wrote:

I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.
Hello David,

For checking the coax cable impedance I have made a description, see:


73, Rudi DL5FA





--
David Ackrill
Re: Testing Cables #cables

David Ackrill
 

Thanks for the reply, Charles,

I may be a dinosaur these days, but I really do not like YouTube videos. I
end up with a pad and paper scrolling back and forward trying to write down
what I need to do.

Is there a PDF or a DOC file please?

Thanks - Dave (G0DJA)

On Mon, 5 Apr 2021 at 22:10, Charles E. Miller <wb6jhq@...> wrote:

Go to youtube and search for nanovna. There are lots of great videos to
show you exactly what you want to know.

Charles Miller

On Apr 5, 2021, at 2:04 PM, David Ackrill <david.ackrill@...> wrote:

?Now that I've got the NanoVNA working, with lots of help from other
people, I'd like to move on to actually using the unit.

I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.

Mainly VHF and UHF, but if they prove to be poor at 50MHz and above, what
they look like below about 30MHz.

So, I guess the input to the cable will be socket CH1 and the output CH0,
but what should I be looking for at the output of a 'good', 'bad' or 'OK
cable at any frequency?

I get that I will need to re-calibrate the system for various frequency
bands, given the 101 data points, I'll take that onboard when I start
checking the cable.

Thanks - Dave (G0DJA)










--
David Ackrill
Re: Testing Cables #cables

 

On Mon, Apr 5, 2021 at 11:04 PM, David Ackrill wrote:

I would like to test various lengths of coaxial cable, mainly 50 ohm
impedance, to check how good, or bad, they are at various frequencies.
Hello David,

For checking the coax cable impedance I have made a description, see:


73, Rudi DL5FA
Re: Testing Cables #cables

 

Go to youtube and search for nanovna. There are lots of great videos to show you exactly what you want to know.

Charles Miller

On Apr 5, 2021, at 2:04 PM, David Ackrill <david.ackrill@...> wrote:

?Now that I've got the NanoVNA working, with lots of help from other people, I'd like to move on to actually using the unit.

I would like to test various lengths of coaxial cable, mainly 50 ohm impedance, to check how good, or bad, they are at various frequencies.

Mainly VHF and UHF, but if they prove to be poor at 50MHz and above, what they look like below about 30MHz.

So, I guess the input to the cable will be socket CH1 and the output CH0, but what should I be looking for at the output of a 'good', 'bad' or 'OK cable at any frequency?

I get that I will need to re-calibrate the system for various frequency bands, given the 101 data points, I'll take that onboard when I start checking the cable.

Thanks - Dave (G0DJA)
Testing Cables #cables

David Ackrill
 

Now that I've got the NanoVNA working, with lots of help from other people, I'd like to move on to actually using the unit.

I would like to test various lengths of coaxial cable, mainly 50 ohm impedance, to check how good, or bad, they are at various frequencies.

Mainly VHF and UHF, but if they prove to be poor at 50MHz and above, what they look like below about 30MHz.

So, I guess the input to the cable will be socket CH1 and the output CH0, but what should I be looking for at the output of a 'good', 'bad' or 'OK cable at any frequency?

I get that I will need to re-calibrate the system for various frequency bands, given the 101 data points, I'll take that onboard when I start checking the cable.

Thanks - Dave (G0DJA)
Re: Measuring an Antenna - Am I doing it right?

 

I highly suggest making the stimulus from 6 to 8 MHz.With the limited number of steps, you can completely step over the 40 Meter band.

On Monday, April 5, 2021, 3:57:44 PM CDT, Cierra <dubosec@...> wrote:

Greetings, I am trying to measure an antenna I built for 40m, but I am not sure if I am doing it correctly. I calibrated the antenna for open, load, and closed, set the stimulus from 3.5 MHz to 30 MHz, I toggled three traces to measure SWR, Smith Chart, and Reflection Coefficient, the scale and reference positions are set at x1, and I am using Channel 0 to test the antenna. I realize the issue could very well be with the antenna itself, but I wanted to rule out any problems I might be having from measuring with the nanoVNA before I write off the antenna. Thanks for any help provided!
Re: SAA-2N From R&L

 

On Sun, Apr 4, 2021 at 12:41 PM, Vladimir Lebedev wrote:

FW from ojisancoubou works very good, but you can not become the screen
capture in program NanoVNA-APP.
Hello Vladimir,

I have added the *screen capture* function to the nanoVNA V2 version of the ojisan firmware, see:


I have also translated his last information about his firmware to English.

73, Rudi DL5FA
Measuring an Antenna - Am I doing it right?

 

Greetings, I am trying to measure an antenna I built for 40m, but I am not sure if I am doing it correctly. I calibrated the antenna for open, load, and closed, set the stimulus from 3.5 MHz to 30 MHz, I toggled three traces to measure SWR, Smith Chart, and Reflection Coefficient, the scale and reference positions are set at x1, and I am using Channel 0 to test the antenna. I realize the issue could very well be with the antenna itself, but I wanted to rule out any problems I might be having from measuring with the nanoVNA before I write off the antenna. Thanks for any help provided!
Re: New User #nanovna-h4

David Ackrill
 

It took me several days, and many trips to the Windows configuration files
before I found out that it was not the drivers that were the problem, but
that I was trying to connect the wrong program to the wrong system...

The bits of the jigsaw that I got wrong were;

1. The software to upgrade the firmware was not the same as the software to
connect the unit to Windows to see the plots. That took me two days to
figure out.

2. The NanoVNA needed to be in a special configuration in order to update
the firmware, and I did not know this fact.

3. Even when I got the software to upgrade the unit set up, it was not
obvious how to upload the updated file.

Dave (G0DJA)

On Mon, 5 Apr 2021 at 21:20, Todd Carney <carneytf@...> wrote:

Dave--Okay, that's good news! Glad you got it working.

On Mon, Apr 5, 2021, 8:39 AM David Ackrill <david.ackrill@...>
wrote:

" Dave--How does it work standalone?"

Hi Todd,

I've moved forward a bit. I finally realised that some of the software
that I was trying to use was for updating the firmware and when I
downloaded a program called "NanoVNASharp" I was able to connect the
laptop
to the unit and see the data on the screen.




--
David Ackrill
Re: I AM NEW TO THIS BUT HAVE A KEEN INTEREST HAVING BORROWED ONE FRON A FRIEND, NOW I WANT TO GET ONE, I HAVE LOOKED ON AMAZON.CA AND SEE AN SAA-N2 FROM HKCNMA.COM FOR 129.00 CAN. It has N type connectors a plus as I find the smaller load etc almost too small to work with, anyone know if this unit works well or any pit falls also what is the warning about damage to the unit about,if you don"t cal after power up. Any comments on this unit, on the surface ot looks good, maybe too good...I hope I'm wrong,thanks

David Ackrill
 

I did not reply originally, as I'm new to the group as well, but I think
the original post may have been posted all in the subject heading?

Dave (G0DJA)

On Mon, 5 Apr 2021 at 17:33, Roger Need via groups.io <sailtamarack=
[email protected]> wrote:

This group is mainly for the NanoVNA, NanoVNA-H and NanoVNA-H4. For info
on the SAA2 with N connectors there is another group. You will have more
luck with your question in that group. Please do not use all CAPS in your
posts as it is considering shouting in these groups.

/g/NanoVNA-V2/topics

Roger





--
David Ackrill
Re: New User #nanovna-h4

 

Dave--Okay, that's good news! Glad you got it working.

On Mon, Apr 5, 2021, 8:39 AM David Ackrill <david.ackrill@...> wrote:

" Dave--How does it work standalone?"

Hi Todd,

I've moved forward a bit. I finally realised that some of the software
that I was trying to use was for updating the firmware and when I
downloaded a program called "NanoVNASharp" I was able to connect the laptop
to the unit and see the data on the screen.
Re: I AM NEW TO THIS ....

Doug Neal
 

Sorry Larry?ThanksSent from my Bell Samsung device over Canada's largest network.

-------- Original message --------From: Larry Rothman <nlroth@...> Date: 2021-04-05 2:06 p.m. (GMT-03:30) To: [email protected] Subject: Re: [nanovna-users] I AM NEW TO THIS .... Doug,PLEASE don't type your message into the SUBJECT area of the message - Use the message box below it!If you're new to this, review the wiki and files sections and you can search the forum messages using search terms.Also - if you're looking at getting a NanoVNA-V2 also known as SAA2, there are other websites and groups for that device - this forum is essentially for the original Nanovna, H and H4 modelsLook here: /g/nanovna-users/message/21727??? On Monday, April 5, 2021, 12:11:42 p.m. EDT, Doug Neal <vo1.dwn@...> wrote:I AM NEW TO THIS BUT HAVE A KEEN INTEREST HAVING BORROWED ONE FRON A FRIEND, NOW I WANT TO GET ONE, I HAVE LOOKED ON AMAZON.CA AND SEE AN SAA-N2 FROM HKCNMA.COM FOR 129.00 CAN. It has N type connectors a plus as I find the smaller load etc almost too small to work with, anyone know if this unit works well or any pit falls also what is the warning about damage to the unit about,if you don"t cal after power up. Any comments on this unit, on the surface ot looks good, maybe too good...I hope I'm wrong,thanks Sent from my Bell Samsung device over Canada's largest network.
Re: I AM NEW TO THIS ....

 

Doug,
PLEASE don't type your message into the SUBJECT area of the message - Use the message box below it!
If you're new to this, review the wiki and files sections and you can search the forum messages using search terms.
Also - if you're looking at getting a NanoVNA-V2 also known as SAA2, there are other websites and groups for that device - this forum is essentially for the original Nanovna, H and H4 models

Look here: /g/nanovna-users/message/21727

On Monday, April 5, 2021, 12:11:42 p.m. EDT, Doug Neal <vo1.dwn@...> wrote:
I AM NEW TO THIS BUT HAVE A KEEN INTEREST HAVING BORROWED ONE FRON A FRIEND, NOW I WANT TO GET ONE, I HAVE LOOKED ON AMAZON.CA AND SEE AN SAA-N2 FROM HKCNMA.COM FOR 129.00 CAN. It has N type connectors a plus as I find the smaller load etc almost too small to work with, anyone know if this unit works well or any pit falls also what is the warning about damage to the unit about,if you don"t cal after power up. Any comments on this unit, on the surface ot looks good, maybe too good...I hope I'm wrong,thanks

Sent from my Bell Samsung device over Canada's largest network.
Re: I AM NEW TO THIS BUT HAVE A KEEN INTEREST HAVING BORROWED ONE FRON A FRIEND, NOW I WANT TO GET ONE, I HAVE LOOKED ON AMAZON.CA AND SEE AN SAA-N2 FROM HKCNMA.COM FOR 129.00 CAN. It has N type connectors a plus as I find the smaller load etc almost too small to work with, anyone know if this unit works well or any pit falls also what is the warning about damage to the unit about,if you don"t cal after power up. Any comments on this unit, on the surface ot looks good, maybe too good...I hope I'm wrong,thanks

 

This group is mainly for the NanoVNA, NanoVNA-H and NanoVNA-H4. For info on the SAA2 with N connectors there is another group. You will have more luck with your question in that group. Please do not use all CAPS in your posts as it is considering shouting in these groups.

/g/NanoVNA-V2/topics

Roger
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