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Hi Martin,
I want to do more things with markers, including having the ability to add
more of them, and/or to change what information is being displayed. Not
sure it will be in the next release, but it's on the list.

I am a little confused, though - my background is not (at all) in RF tech:
Isn't Series R & X = Z? Which is already displayed? Or what are we talking
here?

--
Rune / 5Q5R

On Wed, 16 Oct 2019 at 17:18, Martin via Groups.Io <martin_ehrenfried=
[email protected]> wrote:

Hi Rune,

I just tried NanoVNA-Saver 0.1.3.

I think the new enhancements are a great improvement in terms of usability
and the fixed scaling options help prevent charts 'jumping around' all over
the place when they auto scale, which make comparisons between plots so
much easier.

Thanks for following up on the suggestions, much appreciated.

Cheeky ask - Any chance of adding Series R & X values to the markers in
the next release :-)

Regards,

Martin - G8JNJ

Hello,

This email message is a notification to let you know that the following files have been uploaded to the Files area of the [email protected] group.

• /Firmware/NanoVNA-Q-2019-10-15-e427dbb-with-scanraw.zip

Uploaded By: Larry Rothman <nlroth@...>

Description:
This firmware was created by forum member QRP-RX and has a new console scan command: scanraw. Refer to the latest version of the Console Commands document for how to use it.

Cheers,
The Groups.io Team

Hello,

This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group.

• /NanoVNA Console Commands Oct-16-19.pdf

Uploaded By: Larry Rothman <nlroth@...>

Description:
This is the latest update of the Console Commands for the NanoVNA as of Oct 16th. It replaces the previous version (Oct-15-19). Adds QRP's 'scanraw' command. Please let me know of any errors or omissions.

Cheers,
The Groups.io Team

Wes,
You will find most of the info you're looking for in the forum's WIKI and FILES areas.There are app notes, 'just starting' notes and most other references there.After you browse those areas and have read up on the latest version of the User Guide from Oct 2, you should have a better understanding.
When browsing the forum, set the mode to TOPICS instead of individual messages - you can scroll through faster.
Also, browse the photos section. If you see something intersting, look at the date it was uploaded and go to the messages for that period in time to find more info.
But by all means - play with it!! (after you've calibrated it and don't forget to press RESET, then CALIBRATE to start - it's all in the WIKI)
Cheers,Larry

Many thanks, Rune, IMO a considerable improvement.

Not, "Is there?" but what are some of the more simple functions of this thing which might benefit beginning users, so that as I run into them I can perhaps write some? To be submitted to the group for critique and correction? I would add them to the archive of documentation, for the possible edification of other new people, of course.

Step one, step two, et c., sort of really simple things, starting with basic calibration.

Maybe, "Find the resonant frequency of this antenna-feedline-filter-(whatever)" could be next? Those sorts of things a ham operator might want to know how to do today, rather than spending weeks learning esoterica. (Not a thing wrong with esoterica, just not precisely useful on a day-to-day basis when all you might really need at the moment is where to cut the dipole.)

What else in this vein comes to mind? Does this already exist somewhere? Or is this the wrong forum for such? I'm new here, and don't wish to presume. (I've got decades of practice at being wrong, I'm used to it, and have become unfortunately quite good at it.)


--
Wes Will
N9KDY

OK, got that.
Thanks for the reply.

73, Dick, W1KSZ

Sent from Outlook<>
________________________________
From: [email protected] <[email protected]> on behalf of alan victor <avictor73@...>
Sent: Wednesday, October 16, 2019 8:08 AM
To: [email protected] <[email protected]>
Subject: Re: [nanovna-users] Cal Procedure Question

Hello Dick,

No, reset is confined to the register you are working. It will clear cal data in only that register. The frequency display range you entered will stay in tact. After reset, begin the cal.

Regards, Alan

Hello Warren,

Could you be a little more specific about the vendor on ebay? It would be a
shame to waste money on a dud or substandard product

Cheers,

Tryg

--

Hi Rune,

I just tried NanoVNA-Saver 0.1.3.

I think the new enhancements are a great improvement in terms of usability and the fixed scaling options help prevent charts 'jumping around' all over the place when they auto scale, which make comparisons between plots so much easier.

Thanks for following up on the suggestions, much appreciated.

Cheeky ask - Any chance of adding Series R & X values to the markers in the next release :-)

Regards,

Martin - G8JNJ

On Wed, 16 Oct 2019 at 08:30, <erik@...> wrote:

The nanoVNA is a full three mixer three receiver VNA without the switch to
reverse the signal path

Em,
in that case it would suggest a 4-receiver VNA may be economic if the
switch was external and purchased by the user if they want it.

That’s what the VNWA 3E - it provides the signal, but not the actual switch.

It’s often possible to pick up HP/Agilent 18 GHz SPDT mechanical relays
for a modest amount of money in small quantities. I have 10 here I picked
up very cheaply. I believe there’s a way of configuring just two, which
enables one to reverse the direction of the signal. There’s information
somewhere on the VNWA resources how to do this, without actually needing a
more specialised relay designed for that purpose.

I would see the major advantage of 4-receivers to be the ability to
perform *unknown
thru calibration*. That is incredibly useful, as you can perform a
calibration with two male cables, ignoring the properties of the thru. The
adapter can even be SMA to N, or even a waveguide to coaxial.

The NanoVNA is an amazing bit of kit for the money.

Dave.

--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

Please take a look at hp application note 77-1. Transistor Parameter Measurements. Info in the note still applicable today as well to passive devices. Yes, you need to take care that the device input power CH0 is reduced from the -9 to -12 dBm power level. Say, -20 to -30 dBm. As well, the output power set by the DUT gain is not excessive as delivered to CH1.

In AN 77-1, the grand daddy of the vna, the vector voltmeter is discussed, however, test fixtures and the application of the bias tee network is presented. Note 2- directional couplers are featured on the cover. The vna you use has in effect only one of those couplers (a resistor bridge). Hence you need to turn the device around to obtain the remaining s data. Or, see another post where another user has built a switch function for doing this task.

Also, see LT Spice simulator which is free. LT handles active devices with models and provides S parameter output data. So you can run a simple 2N3904 at 30 MHz or so, where package parasitic of the transistor is not so critical and see the expected results.

There is quite a bit of information to digest before you can expect to get measured results to agree with calculation. However, the eureka moment is sure worth the effort!

FUN.

Hello Dick,

No, reset is confined to the register you are working. It will clear cal data in only that register. The frequency display range you entered will stay in tact. After reset, begin the cal.

Regards, Alan

Very nice.

You may want to post your system to the message group that is discussing test fixtures.
Part of the discussion raises the query on testing devices so full 2 port data is required.

I raised the TRL piece as I have used a combination of TRL and SOL or SOM on another vna.
David is correct that at lower frequency the cal is problematic. However, my fixtures lend themselves to TRL since there is no easy way to equip the DUT to coax.

So going forward with the nanovna will require a pair of decent bias tees or least ones that can be made part of the calibration process with minimum error and a switching system to turn the device end for end.

Thanks,

bryburns via Groups.Io wrote:

It seems to me that when the user clicks "Load" to pick a set of stored "Calibration standards" that you should "Apply" them automatically and not require the user to click "Apply." Just a thought.

Just a different thought. I might be incorrecr here, but from what I have seen of this machine in the last half-day, not automatically "applying" means you can look through the various calibration data -before- it gets applied to the machine, allowing one to pick out the correct (or at least the desired) set of numbers before committing them to the running memory (wiping out what was there).

One "extra" click does not seem all that onerous to me.

--
Wes Will
N9KDY

It looks like I cant add hash tag afterwards

On Wed, 16 Oct 2019 at 13:59, bryburns via Groups.Io <bryburns=
[email protected]> wrote:

On Wed, Oct 16, 2019 at 01:08 AM, Dr. David Kirkby from Kirkby Microwave
Ltd wrote:

I agree that the resistance of the short is unlikely to be an issue, but
the resistance will increase with frequency due to the skin effect.

Dave,

You are correct. I can't measure the skin effect resistance with anything
I have available. So, I am stuck with the best measurement I can make of
the short I use.

--
Bryan, WA5VAH

I would not worry about it.

I was mainly making the point that measuring DC resistance to 1 milli ohm
resolution is not hard with equipment most hobbyists would have.

Dave

--

Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

Hi Bryan,
it does indeed help - I will be making better input validation for that
part of the interface. In fact, it's already on the list for 0.1.4. ;-)

If you want to save a log file, you should use -D logfile.txt - whereas -d
gives you console logging. I don't think traceback messages like the one
you posted here get saved to the log file, though, so it's better for me to
get your console log in crash cases like this.

Thank you very much! And I hope you try out 0.1.3 as well ;-)

--
Rune / 5Q5R

On Wed, 16 Oct 2019 at 15:51, bryburns via Groups.Io <bryburns=
[email protected]> wrote:

Rune,

I have noticed that you save the "Calibration standards" information in
the ".ini" file for nanoVNA-Saver. Great idea. I also observe that after
loading the information from the ".ini" file you still have to click
"Apply" on the Calibration window for the new values to be used even though
you can see them on the "Calibration" form. It seems to me that when the
user clicks "Load" to pick a set of stored "Calibration standards" that you
should "Apply" them automatically and not require the user to click
"Apply." Just a thought.

I started nanoVNA-Saver 0.1.2 in a command window using
"nanovna-saver.v0.1.2.exe -d testlog.txt" Here is the last several lines
on the screen after the crash when changing values on the Calibration form
in the "Calibration standards" box.

2019-10-16 07:38:41,567 - NanoVNASaver.SweepWorker - DEBUG - Sending
"updated" signal
2019-10-16 07:38:41,567 - NanoVNASaver.SweepWorker - DEBUG - Resetting
NanoVNA sweep to full range: 50000 to 900000016
2019-10-16 07:38:41,636 - NanoVNASaver.SweepWorker - DEBUG - Sending
"finished" signal
2019-10-16 07:38:54,382 - NanoVNASaver.Calibration - DEBUG - Loading
calibration no 0
2019-10-16 07:38:54,383 - NanoVNASaver.Calibration - INFO - Loading:
HighOrderForBNC
Traceback (most recent call last):
File "NanoVNASaver\Calibration.py", line 447, in calculate
ValueError: could not convert string to float:

The log file I specified after -d did not get saved.

I hope this helps you find the issue that caused the crash.

--
Bryan, WA5VAH

Rune,

I have noticed that you save the "Calibration standards" information in the ".ini" file for nanoVNA-Saver. Great idea. I also observe that after loading the information from the ".ini" file you still have to click "Apply" on the Calibration window for the new values to be used even though you can see them on the "Calibration" form. It seems to me that when the user clicks "Load" to pick a set of stored "Calibration standards" that you should "Apply" them automatically and not require the user to click "Apply." Just a thought.

I started nanoVNA-Saver 0.1.2 in a command window using "nanovna-saver.v0.1.2.exe -d testlog.txt" Here is the last several lines on the screen after the crash when changing values on the Calibration form in the "Calibration standards" box.

2019-10-16 07:38:41,567 - NanoVNASaver.SweepWorker - DEBUG - Sending "updated" signal
2019-10-16 07:38:41,567 - NanoVNASaver.SweepWorker - DEBUG - Resetting NanoVNA sweep to full range: 50000 to 900000016
2019-10-16 07:38:41,636 - NanoVNASaver.SweepWorker - DEBUG - Sending "finished" signal
2019-10-16 07:38:54,382 - NanoVNASaver.Calibration - DEBUG - Loading calibration no 0
2019-10-16 07:38:54,383 - NanoVNASaver.Calibration - INFO - Loading: HighOrderForBNC
Traceback (most recent call last):
File "NanoVNASaver\Calibration.py", line 447, in calculate
ValueError: could not convert string to float:

The log file I specified after -d did not get saved.

I hope this helps you find the issue that caused the crash.

--
Bryan, WA5VAH

There has been mention of the high price of SMA adapters. The standard
here is N but it appeared that the package described below, that
included BNC and TNC, would be the best way to go.


Adapters for taking SMA to N and to BNC were ordered from Shenzhen
Yishitonga Trade Co., Ltd. through Aliexpress. The "Model Number" was
517A103102. The price was US$17.52 when ordered on 20190805. That was
the all up price delivered. They came through customs into Canada
without charge.

The adapters furnished in the package can be seen on the Yishitonga web
site, u.r.l. below. The adapters, as delivered here, are documented in
the included photograph.

Visually and by handling and mating, the fit and finish are satisfactory
to a user who has seen a few r.f. connectors in his day.

For the h.f. operator, these adapters appear to be suitable. A test at
v.h.f. produced normal results. No statement can be made about
performance at u.h.f. and beyond. No statement can be made about fine
mechanical tolerances or about dielectric.

For the h.f. ham radio station, these adapters seem to be just
fine...particularly at that price.


? ?





John

at radio station VE7AOV


--

On Wed, Oct 16, 2019 at 01:08 AM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:

I agree that the resistance of the short is unlikely to be an issue, but
the resistance will increase with frequency due to the skin effect.

Dave,

You are correct. I can't measure the skin effect resistance with anything I have available. So, I am stuck with the best measurement I can make of the short I use.

--
Bryan, WA5VAH