Interpreting KiwiSDRStream Waterfall Stream when Zoom is 0 vs Zoom 1 through 4

[mrzachhigginsofficial]

Summary: The waterfall data stream is different at zoom 0 than it is at zoom 1-4 and I don't know how to interpret it when zoom=0.

---

I am trying to utilize the KiwiSDRStream class to receive the entire frequency span waterfall data stream (0 to 30 MHz) and plot it in a pg.plotwidget in real-time.

Example of my progress so far.

However, zoom 1 appears to be half of the freq span, not 0 to 30 MHz. I verified visually by comparing the wf from the web UI to the screenshot

When I set the zoom to 0, I get a completely different type of data stream with values between -32768 and +32768 (assuming hz) and is 2038 bytes in length (after unpacking) using the KiwiSDRStream class (as mentioned above). While inconvenient, since the length is different and I'm not doing any interpolation yet, I have to reinitialize the entire image in my graph. Also, I can't appear to find the right color map to display this data (sample results below).

Can you provide any insights as to what I should expect to compute differently between zoom 0 and 1-4? I originally assumed that these data streams should be the same, but it appears they are not.

Really cool library, thank you for sharing with the world. Any help you can provide would be really appreciated! Thanks!

[jks-prv]

The current version of this repo has a working option to create a realtime, appending waterfall .png file. Use the --log-level=debug option to compare the API commands sent to the Kiwi with your code, particularly SET zoom=%d cf=%f

[jks-prv]

I replied on GitHub.

…

On Oct 17, 2022, at 5:27 PM, mrzachhiggins ***@***.***> wrote: Summary: The waterfall data stream is different at zoom 0 than it is at zoom 1-4 and I don't know how to interpret it when zoom=0. I am trying to utilize the KiwiSDRStream class to receive the entire frequency span waterfall data stream (0 to 30 MHz) and plot it in a pg.plotwidget in real-time. Example of my progress so far. <https://user-images.githubusercontent.com/53547287/196086985-85143b5e-16d5-4971-a42e-02e6c0815baf.png> However, zoom 1 appears to be half of the freq span, not 0 to 30 MHz. I verified visually by comparing the wf from the web UI to the screenshot <https://user-images.githubusercontent.com/53547287/196087525-f00afbde-f728-44fa-bd4f-1ee900edeb4a.png> When I set the zoom to 0, I get a completely different type of data stream with values between -32768 and +32768 (assuming hz) and is 2038 bytes in length (after unpacking) using the KiwiSDRStream class (as mentioned above). While inconvenient, since the length is different and I'm not doing any interpolation yet, I have to reinitialize the entire image in my graph. Also, I can't appear to find the right color map to display this data (sample results below). <https://user-images.githubusercontent.com/53547287/196087871-441f66ae-18cf-457b-8a8f-9f99840d2041.png> Can you provide any insights as to what I should expect to compute differently between zoom 0 and 1-4? I originally assumed that these data streams should be the same, but it appears they are not. Really cool library, thank you for sharing with the world. Any help you can provide would be really appreciated! Thanks! — Reply to this email directly, view it on GitHub <#119>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABMD6G236VMCVORC2FIXU7TWDTIRHANCNFSM6AAAAAARGVSFVM>. You are receiving this because you are subscribed to this thread.