VNA "Connect" set DIO0 to "1" and PTT to "on"

[Rolf-L]

How can I prevent the signal DIO0 from being set to "1" when I connect the VNA program? This generates the PTT signal in my Transceiver and turns on the connected Power-Ampli. Only the bias current flows, but it is about 4A and heats up the Power-Ampli after a short time. Can I prevent this by a further command line in the SD Card image file latest version and, if so, what are the commands?

[Rolf-L]

sorry, I dont want to close it

[pavel-demin]

The easiest solution is still to edit line 566 in vna.py and to replace self.set_gpio(1) with self.set_gpio(0).

In the latest GUI version, there is no place left for additional control elements. So, I don't know how to add a GUI element for controlling the GPIO pins.

[Rolf-L]

Hi Pavel,
thank you for your quick response.
Unfortunately, I'm not a software expert.
If I understand that correctly, I'll have to do the correction in the source code and recompile, but that will overwhelm my knowledge.
Is it possible to edit start.sh and insert a command line that does the same thing?
If so, how should this be?
best regards
Rolf

[pavel-demin]

If I understand that correctly, I'll have to do the correction in the source code and recompile,

The recompilation isn't required. One of the ideas behind the VNA client is that it should be very easy to modify. The code is in vna.py and the GUI is in vna.ui. Both files can be edited.

So, the following steps should be enough:

• open vna.py in a good text editor like for example Notepad++;
• go to the line 566;
• replace 1 with 0;
• save the file.

[Rolf-L]

Hi Pavel,
I can only find vna.py on GitHub, but not on the SDCard in the vna folder.
Do I have to make the change on GitHub and what's next?

[pavel-demin]

I can only find vna.py on GitHub, but not on the SDCard in the vna folder.

The vna.py file is on your computer in the folder from where your start the vna.exe program.

[Rolf-L]

Hi Pavel,
If you know how to do it, it's really easy :-)
Thanks again for your quick help.

best regards and have a nice day
Rolf

[Rolf-L]

Hi Pavel,
one of my friends is using the HAMLab-Transceiver, made by Red Pitaya.
He told me that your vna program connects to the HAMLab, but when pressing open short etc. no reaction takes place.
Question: is there a special vna-version for the HAMLab and if so, what is its name and where can he download it, or is it possible, to modify one of the vna-files, like I did it with success?
Best regards,
Rolf

[pavel-demin]

Hi Rolf,

I don't have any special version for HAMLab. The normal version should work just fine.

I'd suspect that the VNA application included in the HAMLab software is outdated and incompatible with the latest version of the VNA client.

To solve the problem, I'd suggest to install the latest version of the VNA application for Red Pitaya. It can be done via the Application marketplace.

Best regards,

Pavel

[chrisdebian]

@Rolf-L Hi, Rolf; is this issue still valid, does it need to stay open?

Chris