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f4exb / sdrangel

SDR Rx/Tx software for Airspy, Airspy HF+, BladeRF, HackRF, LimeSDR, PlutoSDR, RTL-SDR, SDRplay and FunCube
GNU General Public License v3.0
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NOAA (162.55 MHz) does not work on Beta. #1246

Closed mistergitj closed 2 years ago

mistergitj commented 2 years ago

I have been trying the Beta version on W10 x64 using both an AirSpy and a NooElec R820T. It looks like local FM works OK but I tried tuning NOAA (162.55 MHz), local in my area. The signal is very weak and the NBFM and WBFM cannot decode it. Both radios work on other SW, SDR#,HDSDR,cubicSDR with not problems. The signal is strong. I also tried 6.20.3 with the same results. Thanks for any comments, John.

srcejon commented 2 years ago

A screenshot might help

dziban303 commented 2 years ago

Works fine for me in both beta 2 and 3, coming through surprisingly well on a $15 RSP1 clone with a paperclip antenna. So it sounds like a settings issue on your end. Post some screenshots.

mistergitj commented 2 years ago

Thanks to srcejon and dziban. Please look at my screenshot. Comments welcome. Seems to be working better, particularity when I set the sample rate to 2.5 MSps. Here is a screenshot: 7 0 0-beta 3 Probably don't need any changes. The audio is a little clearing on my other radios. I am still learning your application. Thanks, John.

dziban303 commented 2 years ago

If you run into an issue again with an apparently clear signal not being output to audio, on the NFM Demod panel, try hitting the Δ symbol next to Sq on the right-hand side. You may need to play with the dials to its right.

This program definitely has a learning curve, haha. That's half the fun! I've been using SDRangel for some time now and there are still features I haven't gotten to yet. Don't forget, if you hover over buttons and dials, a popup will appear telling you what it is. And if you click the ? icon at the top right of a pane it will open the relevant manual page.

Cheers

On Sun, May 15, 2022 at 7:45 PM mistergitj @.***> wrote:

Thanks to srcejon and dziban. Please look at my screenshot. Comments welcome. Seems to be working better, particularity when I set the sample rate to 2.5 MSps. Here is a screenshot: [image: 7 0 0-beta 3] https://user-images.githubusercontent.com/45215756/168501650-2845085b-bf85-4b00-95b8-a3f50ad2e3b6.jpg Probably don't need any changes. The audio is a little clearing on my other radios. I am still learning your application. Thanks, John.

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mistergitj commented 2 years ago

dziban, thanks for your help. I have now tried the Squelch (Δ) and it helps, but because of the weak signal, it is hard to understand. It is also a function of the time of day. I had failed to investigate the ?, so I did. Thanks, John.

srcejon commented 2 years ago

You have DC filtering enabled and your signal is at the centre frequency - I'm not familiar with the Airspy, but that probably means you are partially filtering your signal.

I'd suggest putting the device centre frequency at 162,450kHz and then add a 100kHz frequency offset to the NFM Demodulator (in the delta f control)

mistergitj commented 2 years ago

Thanks, srcejon.  I will give this a try.  Enjoy, John. 

On Tuesday, May 17, 2022, 02:42:12 AM CDT, srcejon ***@***.***> wrote:

You have DC filtering enabled and your signal is at the centre frequency - I'm not familiar with the Airspy, but that probably means you are partially filtering your signal.

I'd suggest putting the device centre frequency at 162,450kHz and then add a 100kHz frequency offset to the NFM Demodulator (in the delta f control)

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mistergitj commented 2 years ago

That works quite well, srcejon.  I have to do some more testing because I do not understand yet.  Thanks, John. 

On Tuesday, May 17, 2022, 02:42:12 AM CDT, srcejon ***@***.***> wrote:

You have DC filtering enabled and your signal is at the centre frequency - I'm not familiar with the Airspy, but that probably means you are partially filtering your signal.

I'd suggest putting the device centre frequency at 162,450kHz and then add a 100kHz frequency offset to the NFM Demodulator (in the delta f control)

— Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: @.***>

mistergitj commented 2 years ago

On the Air Spy site for their R1/R2 products, I found this statement: "No IQ imbalance, DC offset or 1/F noise at the center of the spectrum that plagues all the other SDRs" I think this is telling me that I do not need the DC function to be set and conflicts with the HW. I apologize that I missed this point. Thanks again for the help offered. Enjoy, John.