Re: [Discuss-gnuradio] RTL-SDR device failed to open in flowgraph

[Glen Langston]

Hi Marcus and Ellie,

Thanks again for the flow graph Marcus.   It's a very impressive piece of work.

If one has only one SDR, it is necessary to change the input  number of channels

to 1, I think(?)  Then connect the 2nd channel (chan1) to the output of the  source

block.   The modified .grc file works right away.

Cheers

Glen

On Thu, Feb 22, 2018 at 11:36 PM, Marcus D. Leech <address@hidden> wrote:

On 02/22/2018 11:13 PM, Ellie White wrote:

Hi all,

I am an amateur radio astronomy enthusiast and I've been using an RTL-SDR (R820T) USB dongle for my projects; up until now I had been using a Windows 8.1 laptop, but that one is on the blink right now so I've switched to a Windows 10 computer. I've tried to plug in my SDR and run the flowgraph (attached), but I keep getting the output below:

Generating: 'C:\\Users\\Deana White\\Documents\\top_block.py'

Executing: C:\Program Files\GNURadio-3.7\gr-python27\python.exe -u C:\Users\Deana White\Documents\top_block.py

Win32; Microsoft Visual C++ version 14.0; Boost_106000; UHD_003.010.001.001-0-unknown

gr-osmosdr c653754d (0.1.5git) gnuradio 3.7.11.1
built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf airspy redpitaya
Using device #0 Generic RTL2832U OEM
usb_open error -12

FATAL: Failed to open rtlsdr device.

Trying to fill up 1 missing channel(s) with null source(s).
This is being done to prevent the application from crashing
due to gnuradio bug #528.

gr::pagesize: no info; setting pagesize = 4096

I've run zadig for the RTL-SDR, and it works just fine with SDR#. Do you have any advice as to why I might be having this problem with the GNURadio flowgraph?

Thanks very much! Have a great evening and take care,

Ellie

I hope someone can help you, Ellie.

My approach would be to install an operating system on your computer.     :) :)   [That was snarkasm, just in case it wasn't obvious.... ]

Once you get it working, you (and Glen et al) might want to play with:

https://github.com/ccera-astro/spectro_radiometer

Cheers
Marcus

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