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Updated Tuners (markdown)

Denny Sheirer
2025-06-13 06:34:52 -04:00
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Tuners.md

@@ -243,3 +243,26 @@ Open the User Preferences dialog and select the Tuners tab to access the RSPduo
### SDRPlay on Mac OS
See the [FAQ](FAQ#how-can-i-use-sdrplay-receivers-on-a-mac-os-computer) wiki for instructions on creating a symbolic link to the sdrplay API driver that sdrtrunk can use.
## Troubleshooting
### Airspy R1/R2 - Dropped Samples At 10 MHz Sample Rate
Running the airspy at the full 10 MHz sample rate can be a challenge for some CPU and USB bus configurations. In the following screenshot, you can see in the waterfall the horizontal lines stretching out from the signal of interest at 451.250 MHz. These are caused by dropped samples. The airspy is attempting to send data to the computer at the full 10 MHz sample rate, but some of the samples are getting dropped. These holes in the sample stream cause these visual artifacts in the FFT and can also significantly impact decoder performance.
![20250613_061702_screen_capture](https://github.com/user-attachments/assets/5bd98d0d-d139-4731-abb3-83c5b38df5e4)
Compare that with this screenshot that shows the same computer and same airspy, where the airspy is plugged into a USB port that is capable of providing the full 10 MHz sample rate:
![20250613_062455_screen_capture](https://github.com/user-attachments/assets/d36b31ce-82db-485e-83d8-c5d29c0374a8)
You can also use the airspy command line tools to diagnose if you are suffering from dropped samples in your airspy. In the following console screenshot, I'm using **airspy_rx** to test receiving and recording airspy samples at 10 MHz sample rate. In the first run, the airspy is plugged into a USB 3 hub that isn't able to deliver the full sample rate and it's dropping ~23,000 samples every second for an average of 9.9767 MSPS sample rate.
![image](https://github.com/user-attachments/assets/7352b2a3-88f9-441b-8df4-ff040716420a)
In the second run, the airspy is plugged directly into a USB 3 port on the host computer (ie no hub) and it is able to deliver the full 10.0 MHz sample rate to the host computer.
How do you fix this? Try plugging your airspy into each of your USB ports to see which port(s) can provide the full sample rate. Consider purchasing a powered external USB hub. Other users have had success with a dedicated add-in PCI card with USB interfaces. If your computer is too slow/old, that may also be the problem. Finally, if you can't resolve it with any of these options, reduce the sample rate from 10 MHz to a lower supported sample rate.
![image](https://github.com/user-attachments/assets/acad5c53-6f8c-403f-b018-aeb812f80a1d)