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I'm unable to get it to work with my receiver (setRegBuffer failed block=0x600 reg=74, Caused By: RadioError.UsbTransferError: USB write failed value=0x74 index=0x610 status=stall), but I love the idea!

Looking forward to a local webusb+rtlsdr based Flightradar.

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Is your stick an RTL-SDR Blog V4? Because it looks like the failure happens when accessing a R828D tuner, which should be supported.

Unfortunately I don't know what device it is. Would a lsusb help?

If you don't know, it probably isn't; they brand it quite extensively both outside and in the USB manufacturer strings (it appears as "Blog V4" in the device selection window.)

If it is indeed not one of them, I'd be interested in getting one to test on, so I'd like to know where you got it from. Can you email me? My address is trivial to find or figure out knowing my website is https://jacobo.tarrio.org :-)

I took a closer look. It's a Hama Nano DVB-T (00053330), over a decade old.

Ah yeah, E4000 tuner, those were hard to come by even 10 years ago, so I didn't support them. Only R820 and R828 and compatibles...

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