Re: Common ground and 2-port measuring
Hi Victor,
Thank you, I await your results on DM measurement after your parts arrive, if you are kind enough to post them. I hope you have better experience than I on delivery, I ordered some items from China just after Christmas, they arrived last week!
What else do you see as needed with my DM method to obtain a complete model for DM measurement?
Our discussion started out as, is there a difference, significant or otherwise between your DM measurement technique and my simpler approach to practical measurement. It has widened now.
Re models and your footnote link -
This is part of a very long and detailed webpage of an unknown authors investigation and experimentations ¡°to determine which Hybrid Choke/Transformer to use for a 40m OCFD¡±. As of today, no conclusion is yet written.
The section you bring to my attention today appears to relate to the ¡®OC¡¯ measurement and model rather than DM/CM representations. I do not see any comparisons between OC and DM/CM i.e. how well does OC compare to DM/CM, do you have any information on this?
Kind regards
Ed
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Re: Ubuntu PPA or .deb installation
Sure, but a PPA simplify update.
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Re: Should I upgrade firmware, and if so which version to use?
I also upgrade.. In some cases just minutes after an upgrade is available (example sdrradio console)... But that's off topic grin
I am also a member of test team group..
So if you are not fear of upgrading and maybe step backwards if there is a bug (or just wait for next release) then i try to be right on the last version.. Be it with sdrc.. Or with v2plus4 or v2
That helps developers to find bugs easier
Imagine you find a bug.. And tell programmer that it is "somewhere in the last 20 versions"... Not easy to find
If you have only one device.. And need it regularly.. Then maybe stay a bit slower on upgrades... But i have three different v2 units.. So i test a new fw in one.. And if ok i upgrade the other two
Cause those are a bit different. Its a good test... I have a v2 modded with a 4 inch screen... An saa2n modded to v2plus (means 4 inch and n socket)
And a v2plus4 (4 inch but much different fw cause bootloader used is closed source)
So three slightly different units.
If i have some sparetime i will add sd card to one... And use fw from dislord that supports storage on card..
So.. The v2 and all of its clones, brothers and daughters... Is a living project
Where one can stay on a unit and fw and just use like it is.. Or upgrade and modify (sometimes with solder work)... And have all newest bings and boings
(sd card storage, real time clock, battery display)
So its your choice to have an up to date unit.. Or stay in an earlier fw
Dg9bfc sigi
Am 14.07.2022 16:45 schrieb "David J Taylor via groups.io" <david-taylor@...>:
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One basic practice of networking is: "If it works, leave it!".? If your
VNA
works well-enough for you, there's no /need/ to upgrade, but also no
reason why
you should not experiment - if you wish.
I try to wait a few weeks after an update is released before upgrading,
see how
others get on, but I do upgrade regularly.
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
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You will find a lot of useful videos on youtube... If you looked a few of them you at least know some basics
What is that damned smith for??
How to calibrate
What are all those traces mean
How to measure this or that
...
So i highly recommend to watch a few of those..
Greetz sigi dg9bfc
Am 14.07.2022 16:44 schrieb "Chuck, KF0CT" <chu_r@...>:
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?
________________________________
From: [email protected] <[email protected]> on behalf of
Reinier Gerritsen <r.gerritsen@...>
Sent: Thursday, July 14, 2022 2:38 PM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] nanoVNA for Nerds
I can't tell, never saw "Grumpy old men" , but I'd name Waldorf and
Statler.?
On July 14, 2022 4:10 PM Chuck, KF0CT <chu_r@...> wrote:
Yes, that's right.? You are looking more and more like Walter Matthau every day.??? ? And I'm looking like Jack Lemmon more every day....
________________________________
From: [email protected] <[email protected]> on behalf of
Reinier Gerritsen <r.gerritsen@...>
Sent: Thursday, July 14, 2022 1:06 PM
To: [email protected] <[email protected]>; Lou W7HV via groups.io <louandzip@...>
Subject: Re: [nanovna-users] nanoVNA for Nerds
That is absolutely true. But if you just reveived a nanoVNA and ask for help for the absolute basics and tell us you want "just ohms", that's not
the right spirit in my opinion. Or maybe I'm becoming an old grumpy man...
On July 14, 2022 2:31 PM Lou W7HV via groups.io
<louandzip@...> wrote:
It seems many posters here are learning a lot and figuring things out
they didn't know after having bought a nanoVNA.? If it successfully
motivates that, then perhaps buying one before you know much about it
might be a good thing for some. They're cheap enough.
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Re: Should I upgrade firmware, and if so which version to use?
One basic practice of networking is: "If it works, leave it!". If your VNA
works well-enough for you, there's no /need/ to upgrade, but also no reason why
you should not experiment - if you wish.
I try to wait a few weeks after an update is released before upgrading, see how
others get on, but I do upgrade regularly.
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
|
? ________________________________ From: [email protected] < [email protected]> on behalf of Reinier Gerritsen <r.gerritsen@...> Sent: Thursday, July 14, 2022 2:38 PM To: [email protected] < [email protected]> Subject: Re: [nanovna-users] nanoVNA for Nerds I can't tell, never saw "Grumpy old men" , but I'd name Waldorf and Statler.? On July 14, 2022 4:10 PM Chuck, KF0CT <chu_r@...> wrote:
Yes, that's right. You are looking more and more like Walter Matthau every day. ? And I'm looking like Jack Lemmon more every day....
________________________________
From: [email protected] <[email protected]> on behalf of Reinier Gerritsen <r.gerritsen@...>
Sent: Thursday, July 14, 2022 1:06 PM
To: [email protected] <[email protected]>; Lou W7HV via groups.io <louandzip@...>
Subject: Re: [nanovna-users] nanoVNA for Nerds
That is absolutely true. But if you just reveived a nanoVNA and ask for help for the absolute basics and tell us you want "just ohms", that's not the right spirit in my opinion. Or maybe I'm becoming an old grumpy man...
On July 14, 2022 2:31 PM Lou W7HV via groups.io <louandzip@...> wrote:
It seems many posters here are learning a lot and figuring things out they didn't know after having bought a nanoVNA. If it successfully motivates that, then perhaps buying one before you know much about it might be a good thing for some. They're cheap enough.
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I can't tell, never saw "Grumpy old men" , but I'd name Waldorf and Statler.?
toggle quoted message
Show quoted text
On July 14, 2022 4:10 PM Chuck, KF0CT <chu_r@...> wrote:
Yes, that's right. You are looking more and more like Walter Matthau every day. ? And I'm looking like Jack Lemmon more every day....
________________________________
From: [email protected] <[email protected]> on behalf of Reinier Gerritsen <r.gerritsen@...>
Sent: Thursday, July 14, 2022 1:06 PM
To: [email protected] <[email protected]>; Lou W7HV via groups.io <louandzip@...>
Subject: Re: [nanovna-users] nanoVNA for Nerds
That is absolutely true. But if you just reveived a nanoVNA and ask for help for the absolute basics and tell us you want "just ohms", that's not the right spirit in my opinion. Or maybe I'm becoming an old grumpy man...
On July 14, 2022 2:31 PM Lou W7HV via groups.io <louandzip@...> wrote:
It seems many posters here are learning a lot and figuring things out they didn't know after having bought a nanoVNA. If it successfully motivates that, then perhaps buying one before you know much about it might be a good thing for some. They're cheap enough.
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Yes, that's right. You are looking more and more like Walter Matthau every day. ? And I'm looking like Jack Lemmon more every day.... ________________________________ From: [email protected] < [email protected]> on behalf of Reinier Gerritsen <r.gerritsen@...> Sent: Thursday, July 14, 2022 1:06 PM To: [email protected] < [email protected]>; Lou W7HV via groups.io <louandzip@...> Subject: Re: [nanovna-users] nanoVNA for Nerds That is absolutely true. But if you just reveived a nanoVNA and ask for help for the absolute basics and tell us you want "just ohms", that's not the right spirit in my opinion. Or maybe I'm becoming an old grumpy man... On July 14, 2022 2:31 PM Lou W7HV via groups.io <louandzip@...> wrote:
It seems many posters here are learning a lot and figuring things out they didn't know after having bought a nanoVNA. If it successfully motivates that, then perhaps buying one before you know much about it might be a good thing for some. They're cheap enough.
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OK what are you trying to do?
If you want to use it as an SWR meter you can:
- initially ignore ca;ibaration: it will have impact on the actual values,
but not the shape of the curve
- turn off curves other than SWR
and compare the results with your other SWR meters.
The calibration procedure can be found at:
-
It might be useful to get the test board:
-
and experiment with the different test options.
Good luck!
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On Thu, Jul 14, 2022 at 5:03 AM Observer <tvstreamdevice@...> wrote: Just recieved a nanoVNA today.
Can someone tell me or point me to online sources about , without fancy
mathematical technical terms :
How to start , I heard, I need to calibrate ? How ?
How to check antenna impedance, in ohms please, no smiths charts stuff ,
just ohms !
How to check capacitors and inductor values .
How to check the input /output impedance of test equipment
--
73,
AB1PH
Don Rolph
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That is absolutely true. But if you just reveived a nanoVNA and ask for help for the absolute basics and tell us you want "just ohms", that's not the right spirit in my opinion. Or maybe I'm becoming an old grumpy man...
toggle quoted message
Show quoted text
On July 14, 2022 2:31 PM Lou W7HV via groups.io <louandzip@...> wrote:
It seems many posters here are learning a lot and figuring things out they didn't know after having bought a nanoVNA. If it successfully motivates that, then perhaps buying one before you know much about it might be a good thing for some. They're cheap enough.
|
It seems many posters here are learning a lot and figuring things out they didn't know after having bought a nanoVNA. If it successfully motivates that, then perhaps buying one before you know much about it might be a good thing for some. They're cheap enough.
|
Sorry, a VNA is not suited for you. You'll need to understand how it works and what calibration does. Otherwise you won't be able to trust your measurements. Cookbook recipes cover just a fraction of my VNA work. And do get a grip on Smith charts, you won't regret it. No need to be a math wizzard in order to grasp the basics.
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On July 14, 2022 11:03 AM Observer <tvstreamdevice@...> wrote:
Just recieved a nanoVNA today.
Can someone tell me or point me to online sources about , without fancy mathematical technical terms :
How to start , I heard, I need to calibrate ? How ?
How to check antenna impedance, in ohms please, no smiths charts stuff , just ohms !
How to check capacitors and inductor values .
How to check the input /output impedance of test equipment
|
On Thu, Jul 14, 2022 at 11:55 AM, Arie Kleingeld PA3A wrote:
It is nice to know what you actually want to measure and how to measure some
basic stuff in the first place.
Arie, you are 100% right. I.M.H.O it's the wrong way to buy something (although very nice) and try to find a problem to solve. The better path (again to my humble opinion) is when you encounter a problem, understand it, find a way to measure it, buy a NanoVNA and then solve it. Or when you want to develop/experiment, first learn the basic stuff. 73 Alex, PE1EVX
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All answers and links to manuals are in the wiki, see the links below.
You'll learn a lot in a short time, faster than letting people type it out again :-)
Then again, if you are not familiar with the language involved, you better visit study that first. It is nice to know what you actually want to measure and how to measure some basic stuff in the first place.
Personally I learned a lot reading the wiki and following a few weeks of meassages in this group.
73
Arie
Op 14-7-2022 om 11:03 schreef Observer:
toggle quoted message
Show quoted text
Just recieved a nanoVNA today.
Can someone tell me or point me to online sources about , without fancy mathematical technical terms :
How to start , I heard, I need to calibrate ? How ?
How to check antenna impedance, in ohms please, no smiths charts stuff , just ohms !
How to check capacitors and inductor values .
How to check the input /output impedance of test equipment
|
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|
Just recieved a nanoVNA today.
Can someone tell me or point me to online sources about , without fancy mathematical technical terms :
How to start , I heard, I need to calibrate ? How ?
How to check antenna impedance, in ohms please, no smiths charts stuff , just ohms !
How to check capacitors and inductor values .
How to check the input /output impedance of test equipment
|
Re: Common ground and 2-port measuring
In the sketch
from
bobine
It uses two transformers head to tail, which seems logical.
--
F1AMM Fran?ois
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-----Message d'origine----- De la part de Victor Reijs jeudi 14 juillet 2022 07:27
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Re: Common ground and 2-port measuring
Hello Ed,
I postpone my experiments until I can build these transformers needed to do
a proper(?) DM measurement (as described in the earlier article, Fig. 16b).
A month ago I ordered some small toroids (also to make a three way RF
meter), still awaiting them.
I think your T1 measurement is only part of getting a DM model/measurement.
All the best,
Victor
P.S. The article is about CMC build of non-coax/twined cable, so the
model/results I somewhat different then for a 'transmission line' (RF) CMC:
Op di 12 jul. 2022 om 08:58 schreef Ed G8FAX <ed@...>:
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Hi Victor,
Thank you for your update and information.
There are different ways to measure CMC performance as there are different
'lumped' component models of a CMC taking account of parasitic elements of
a practical or real component.
There is merit in making a test configuration and method for how the
component will be used in a particular application. If I were designing and
making a CMC filter, I would use a different method of testing to my simple
proposal, one very similar to your preferred configuration.
I do not have any rf 1:1 center-tapped baluns so am not able to compare
results. If and when you have time to make comparisons, I would be very
interested in your findings.
Kind regards
Ed, G8FAX
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Re: Should I upgrade firmware, and if so which version to use?
Apples and oranges. The Nano is a small dedicated purpose device with a tight team of very smart developers. Windows is a bloated Swiss Army knife *operating system* software by committee. Hardly a fair comparison. I update my Linux boxen regularly and rarely have any issues. 73 -Jim NU0C On Wed, 13 Jul 2022 05:20:30 -0400 "David Wilcox K8WPE via groups.io" <Djwilcox01@...> wrote: Case in point¡. Windows upgrades! How many issues occur every time that happens? It sure generates a multitude of emails to the various QRP groups I follow. Even Linux seems to have multiple upgrades of each version¡. What to do?
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Nickko - ON9NG
David J Taylor
Lou W7HV
Arie Kleingeld PA3A
Ho-Ro
Jim Shorney