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Date
Rotted Link to NanoVNA-Saver on Wiki

Lee
 

I am trying to come up to speed with my NanoVNA and the NanoVNA Saver software on my own (not asking every single question on the forum).

I have installed NanoVNA-Saver and connected to my instrument but need instructions.

Regarding the wiki at: /g/nanovna-users/wiki
The link on getting started with NanoVNASaver goes to a message with a link that has rotted
Getting Started (NanoVNA-saver Version 0.2.0) by Gunthard Kraus, DG8GB
/g/nanovna-users/message/7663

The rotted link:
<

At this moment this is my stumbling block to getting further with NanoNVA Saver.
What should I do?

Lee Erickson
Genuine NanovnaH4 back in stock r&l electronics #nanovna-h4

 

Just thought I'd let the group know that r&l electronics has the h4s back in stock for $59.95. f o b Hamilton Ohio so shipping will be fast. I have no interest other than being a satisfied customer of r&l.
--
Randy AB9GO
Milan Indiana USA
Re: NanoVna Test fixture

 

hi,
then I will help you with the solution:
you download the ...- master.zip on github, unzip it and find a "fixture" folder in it where you can find the gerber files to make the pcb. You will usually need to send this in .zip packaging to the pcb manufacturer who manufactures it. By the way, Dan, KW4TI is the author who made it all. Its name is on the first page of the presentation.
You can read about it in another group here:
/g/radioartisan/topic/latest_version_of_the/53014887

I wish you a successful making.
73, Gyula HA3HZ

--
*** nothing is permanent only change ( ) ***
Re: Instruction Manual

 

Hi,

If you are viewing this message on your mail client a link at the bottom of the message will take to the io group page and then files and wiki menu will be on the left of your screen.

73,

Bill KU8H

bark less - wag more

On 6/5/20 5:00 AM, Jon-G0MYW wrote:
there's lots of real good information (+ manual) in the "Files" + "Wiki" section on the left of this screen....
Re: Help Testing a Low Pass Filter

 

Hi GM7,

Yes I understand now surely after seeing your picture of the testfixture itself. I understand you found the problem in? the mean time.

The results not being perfect can be caused by component tolerances, stray -capacitances en -inductances, resistance of the inductors and in- and output of the filter not being terminated perfectly.

73

Jos


Op 4-6-2020 om 22:20 schreef GM7:

Hi Jos,

Thanks for the reply. The photo doesn't show the setup very clearly. The LPF is a small board with male pins at either end. The fixture I built is a small board with female sockets to match the pins of the LPF. These sockets are connected to the SMA sockets on the board.

I also built two very small plugs to use for calibration. One with the pins shorted and one with a 50ohm resistor across the two pins. To calibrate I connect the fixture without the LPF to the NanoVNA using the two short SMA cables. I then follow the normal calibration routine before fitting the LPF.
Re: Instruction Manual

 

there's lots of real good information (+ manual) in the "Files" + "Wiki" section on the left of this screen....
Re: Help Testing a Low Pass Filter

 

Another response plot with better display settings for the x-axis.

40m Response III.png

Re: Help Testing a Low Pass Filter

 

Hi All,

I've attached the response curve of the 40m filter after being corrected. It's not perfect but it now looks like the response for a 40m LPF. The initial passband has some loss but that's presumably a function of component losses?

Roger, good spot on the logarithmic x axis scale.

Thanks again to everyone for their help. If anyone has anything more advice on LPF design or measurement it would be gratefully received.

40m repsonse II.png

Re: Help Testing a Low Pass Filter

 

Hi avvidclif,

The test fixture and calibration 'tools' are homemade. You can see more detail in this picture.

Fixtures.png

Re: white screen and flashing

 

Read more info on my site.
73, Gyula HA3HZ

--
*** nothing is permanent only change ( ) ***
Re: Help Testing a Low Pass Filter

 

Might I ask where you got the test fixture?
NanoVna Test fixture

 

In the RARS presentation on using the NanoVna it references a test fixture supposedly available thru github. It's the one with the ZIF socket for testing components. Is anyone making those for sale or knows where to buy one, either complete or just the PCB??? My searching is not going well...

BTW that presentation is very nice, even I could understand it.
Re: Installed an ST32F303 in my Ver 1 nanoVNA #hardware #firmware #bootloader #hack #mods

 

Hugen,
The early FW version talks about connecting PA10 to PA12 but in your H4 schematic, it shows PA8 through R48 to PA12.? I assume R48 is not installed?
Also, what about the USB_V_IN on PA4? Do I need to sense that if using the F303?
Thanks
Larry



On Thu, 4 Jun 2020 at 8:34 PM, Hugen<hugen@...> wrote: Try this early test version, it can run on F303 without external crystal, there may be a lot of errors.
Re: Installed an ST32F303 in my Ver 1 nanoVNA #hardware #firmware #bootloader #hack #mods

 

Thanks Hugen, I added an 8M xtal with 22pf caps but it won't oscillate. (I lifted pin 5 from solder pad to connect the xtal).
According to the datasheet, the F303 internal RC OSC is supposed to run at 8M if there is no external xtal.? I can program and read the chip with ST-link so I'm not sure why it's not working.?
I'll compile and load this version and see the effect. I assume this version uses MCLK for the uP?

Regards
Larry

On Thu, 4 Jun 2020 at 8:34 PM, Hugen<hugen@...> wrote: Try this early test version, it can run on F303 without external crystal, there may be a lot of errors.
Re: Installed an ST32F303 in my Ver 1 nanoVNA #hardware #firmware #bootloader #hack #mods

 

Try this early test version, it can run on F303 without external crystal, there may be a lot of errors.
Re: Help Testing a Low Pass Filter

 

Sorry, slow link and little patience.

On 6/4/20, Jose Amador <jose.co2ja@...> wrote:
To satisfy my curiosity, I decided to simulate the three inductors in
series.

I find a quite good agreement. For curiosity sake I lowered the start
frequency to 100 kHz, otherwise is quite the same.

73, Jose, CO2JA
Re: Help Testing a Low Pass Filter

 

To satisfy my curiosity, I decided to simulate the three inductors in series.

I find a quite good agreement. For curiosity sake I lowered the start
frequency to 100 kHz, otherwise is quite the same.

73, Jose, CO2JA

ScreenShot172.png

Re: Help Testing a Low Pass Filter

 

To satisfy my curiosity, I decided to simulate the three inductors in series.

I find a quite good agreement. For curiosity sake I lowered the start
frequency to 100 kHz, otherwise is quite the same.

73, Jose, CO2JA

ScreenShot172.png

Re: Definition of terms

 

Here is a link that should help you

Frank Ketterman
f.ketterman@...
AC0XV

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of gary.sewell@...
Sent: Thursday, June 4, 2020 16:01
To: [email protected]
Subject: [nanovna-users] Definition of terms

On the Nanovna Saver, there are markers that you can assign values to like SWR, Return Loss, etc. Could someone in simple terms explain some of the others like:

Quality factor
S11 Phase
S11 Group Delay
S21 Phase
S21 Group Delay
Re: Definition of terms

 

*Group Delay* is here:


This is off the RFCafe.com site. This is an excellent source of
information for all things involving RF and microwaves. Poke around here
and you will likely find answers to all your questions regarding RF and RF
measurements.

Phase is the difference in phase (peak-to-peak or valley-to-valley or zero
crossing to zero crossing) between the original source RF to the sink RF
(after it passes through [two port measurements] or reflected [single port
measurements] from the EUT).

Dave - W?LEV

On Thu, Jun 4, 2020 at 4:43 PM <gary.sewell@...> wrote:

Dave,

Maybe I am missing something but where in wiki are you referring to? I
have been looking all through wiki but I can¡¯t find anything that answers
my questions.



--
*Dave - W?LEV*
*Just Let Darwin Work*
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