I worked with Touchstone some 40+ years ago. Les Besser originated this early microwave computer modeling/analysis application of which Touchstone was his major contribution. Of course, in its day, it ran on mainframes. We had the IMB 370 on my job. PC's didn't exist, yet. Punched cards were the data entry standard of the day. Dave - Old Fossil - W?LEV On Wed, May 27, 2020 at 8:28 AM warnergt via groups.io <warnergt= [email protected]> wrote: I used to use Touchstone many, many years ago. It was a great program.
I haven't worked with S parameters for a long time so I'm out of touch
with the currently available applications.
What current applications work like Touchstone and/or work with Touchstone
files?
-- *Dave - W?LEV* *Just Let Darwin Work*
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Information about Touchstone file format
Touchstone? File Format Specification Version 2.0
PS thanks, I was just looking for a specification for a given file format for export to SD Card
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Re: Measure Crystal Characteristics Automatically Using a NanoVNA
#xtals
Looks interesting, I'll need to spend a little time figuring out how to get it to run. I pulled the files and spent a few minutes with it this morning, but couldn't get it to play (yet). I'm really a noob when it comes to Python. Previous Python scripts have had installation scripts or at least a requirements doc...
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Touchstone is a file format that provides a standardized way for programs to output S parameters (S11, S21) so they can be read by other programs. The extension can be .s1p, .s2p etc.
There are many programs that can import S parameters. I have a RigExpert antenna analyzer and I often import NanoVNA Touchstone files with AntScope 2 so that I can compare the measurements made with the two instruments. Antscope 2 is a free download and you can use it without a RigExpert. It has nice plotting and scaling options.
Roger
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SimSmith
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I used to use Touchstone many, many years ago. It was a great program.
I haven't worked with S parameters for a long time so I'm out of touch with the currently available applications.
What current applications work like Touchstone and/or work with Touchstone files?
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I¡¯ve never heard of this software before. What is it and how does it apply to the use of a VNA in general? Thanks in advance. 73, Tony VE3DWI. On Wed, May 27, 2020 at 10:28 warnergt via groups.io <warnergt= [email protected]> wrote: I used to use Touchstone many, many years ago. It was a great program.
I haven't worked with S parameters for a long time so I'm out of touch
with the currently available applications.
What current applications work like Touchstone and/or work with Touchstone
files?
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Re: Test fixture question
It looks wonderful, Just a tip
In my experience with this type of test jigs, when using the transformer configuration it is better to add some attenuation at the input and output (3-6 dB), this produces a better match to 50 Ohm when the crystal is not at exactly its series resonance, and the accuracy is improved.
I think that it can be done in your PCB as it is.
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El 27/05/2020 a las 6:19, Bill Buoy escribi¨®: Test fixture progress update:
The prototype boards arrived late last week. The components had arrived the week before, so between Memorial Day visits with the family and watching the local events, I built three versions over the weekend that I think will fit in with my immediate plans.
Testing with three crystals that I had on hand produced results as expected. The crystals were tested in the two versions that are targeted to that task. One version was built with a resistive attenuators to match the 50 ohm VNA impedance to 12.5 ohms. The other version uses a 4:1 balun on each side of the crystal to match the output and input of theVNA.
Assembly of the devices revealed a couple of changes to make assembly easier or accommodate easier parts selection. I will incorporate these changes, regenerate the production files, and resubmit for estimates. I plan to finish this and have answers by next week.
To accommodate the greatest number of people interested in this, I think the best way to release the files is to make the project public on Osh Park, publish the files here, and on my personal website.
--
El software de antivirus Avast ha analizado este correo electr¨®nico en busca de virus.
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I used to use Touchstone many, many years ago. It was a great program.
I haven't worked with S parameters for a long time so I'm out of touch with the currently available applications.
What current applications work like Touchstone and/or work with Touchstone files?
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Hello Luis,
yes, with battery in place. That's why I was worried that it will drain it. But after a few seconds the LEDs went off anyway. This makes me wait each time before putting it into the box - I guess I am a little like the Scottish guy, who didn't believe that the refrigerator light goes off, when you close the door :-)
For me, the portability and "groundlessness" are a big plus, so the battery is essential.
My intention was not additional shielding, just thought about FR4 because it is so easy to make a box by simple soldering. But in my experience, RF circuits often start to misbehave, when you put them into a metal box. Boxes have resonances, increasing the crosstalk between distant parts of the PCB, that's why metal boxes for RF circuits are in most cases subdivided into small compartments, often stuffed with absorber foam.
How did the 3D printed box come out? The little buttons, USB connector accessibility? SMA connectors fixed with nuts?
Marko Cebokli
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Re: Test fixture question
Looks very good !
Op 27-5-2020 om 06:19 schreef Bill Buoy:
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Test fixture progress update:
The prototype boards arrived late last week. The components had arrived the week before, so between Memorial Day visits with the family and watching the local events, I built three versions over the weekend that I think will fit in with my immediate plans.
Testing with three crystals that I had on hand produced results as expected. The crystals were tested in the two versions that are targeted to that task. One version was built with a resistive attenuators to match the 50 ohm VNA impedance to 12.5 ohms. The other version uses a 4:1 balun on each side of the crystal to match the output and input of theVNA.
Assembly of the devices revealed a couple of changes to make assembly easier or accommodate easier parts selection. I will incorporate these changes, regenerate the production files, and resubmit for estimates. I plan to finish this and have answers by next week.
To accommodate the greatest number of people interested in this, I think the best way to release the files is to make the project public on Osh Park, publish the files here, and on my personal website.
|
Re: Test fixture question
Test fixture progress update:
The prototype boards arrived late last week. The components had arrived the week before, so between Memorial Day visits with the family and watching the local events, I built three versions over the weekend that I think will fit in with my immediate plans.
Testing with three crystals that I had on hand produced results as expected. The crystals were tested in the two versions that are targeted to that task. One version was built with a resistive attenuators to match the 50 ohm VNA impedance to 12.5 ohms. The other version uses a 4:1 balun on each side of the crystal to match the output and input of theVNA.
Assembly of the devices revealed a couple of changes to make assembly easier or accommodate easier parts selection. I will incorporate these changes, regenerate the production files, and resubmit for estimates. I plan to finish this and have answers by next week.
To accommodate the greatest number of people interested in this, I think the best way to release the files is to make the project public on Osh Park, publish the files here, and on my personal website.
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Re: Running Mac installation as an application
Thank you so much, Mario! Your suggestion worked perfectly!
All the best,
John
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Re: Android NanoVNA WebApp
I know of only one phone app that is for android phones. It is available on
Google play store.
It is NanoVNA.
TOM KC7BJE
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I just tried this () and it works. There is one modification that needs to be made to the script.
The formulas for computing the return loss (20log(S11)) have a syntax error.
This is because Octave's base 10 log syntax is "log10(x)".
The current program uses "log(x)" syntax which computes the natural log.
The fix is to change "Log mag = 20log(abs(D))" to "Log mag = 20*log10(abs(D))"
This effects three comment lines ( 8, 184, and 204 ) and the main program line # 136.
The result is that if you run the program with a known 20 dB return loss load, it will read over 40 dB.
Bob, W1RS
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Measure Crystal Characteristics Automatically Using a NanoVNA
#xtals
Crystal measurement and design seem to be a hot topic among some of this group's members. Rose engineering has shared a python script at to automatically characterize your crystals using a test fixture and a Nanovna.
Since the script is written in Python it should run of Windows, Linux and the MacOS.
Herb
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Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support
#firmware
What functionality does adding the miniSD card add?
The same option as a device used to store files on a computer. Depending on the size of the SD card, you can store graphs without having to take your computer with you. Currently, NanoVNA-Saver is a PC program that allows you to store a graph and retrieve it later. 73, Gyula HA3HZ -- *** nothing is permanent only change ( ) ***
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Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support
#firmware
You can use it to:
- install new firmware
- save & restore calibrations
- save & resore screens
- save & restore setups
.....etc? (once all the enhancements are written by the developers)
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On Tuesday, May 26, 2020, 12:37:02 p.m. GMT-4, Birdman <ccarrara@...> wrote:
I really hate to ¡°interrupt¡± you guys with this important work/discussion... but...
What functionality does adding the miniSD card add?
--
Regards,
Chris
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Re: NanoVNA firmvare, compiled by DiSlord #firmware with MiniSD support
#firmware
I really hate to ¡°interrupt¡± you guys with this important work/discussion... but...
What functionality does adding the miniSD card add?
--
Regards,
Chris
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Re: Running Mac installation as an application
This shell file currently works for me (where I manually install nanosaver), but don't forget to mark it executable and make sure it has the ".command" extension.
M
##!/bin/bash
cd ~/dvl/nanosaver/nanovna-saver-master/
python3 nanovna-saver.py
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Do you have the battery placed when the LEDs are lit?
Thats because of the V2 charging mechanism.
I am not sure if I would find the V2 useful "portable" ie, with power from
batteries. If I needed for a an antenna analysis I would simply use a USB
power bank. I think this device belongs to the lab bench.
FR4 is OK, it will isolate from the outside RF. I have 3D printed my casing
in ABS, no need to shield it more than it is already :)
*73 de Lu¨ªs, CT2FZI*
*QRV @ 145.300 MHz | **CQ0VMST (VHF REP Monsanto)*
<>
<>
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On Tue, 26 May 2020 at 16:00, <mcebokli@...> wrote: I got my SAA2 a few days ago, the bare bones version from tindie.
BTW, is feedback expected at tindie? Found no mechanism on their page, but
I'm not registered, so...
I have already ordered a battery before, so I connected it, and it works.
A bit clumsy that there is no option to fasten the battery. I have just put
it between the two boards, will probably use some two sided sticky tape.
Also thinking of soldering together a case out of 1mm FR4 material. Does
anybody have experience if a metal (copper clad) case will cause any
degradation?
Why are the LEDs lit for some time after power off? That's pretty
confusing, especially when first encountered.
When I'll find some time, I hope to do some tests and write a short review.
Marko Cebokli
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Bill Buoy - N5BIA
Roger Need
Tony. VE3DWI
Clyde Lambert
Gyula Molnar
Chris K2STP
CT2FZI