Hi all,

Thanks for sharing that, Marcus! I agree with Glen that it looks like a great 
tool, and I look forward to testing it out -- feel free to post it on the Open 
Source Radio Telescopes mailing list as well in case there are folks there who 
would like to use it, too.

So, back to the original question -- I am still not having any luck getting my 
RTL-SDR dongle to work with GNURadio on Windows 10, despite the fact that the 
dongle works just fine with SDR# on the same computer. Is this a known issue, 
and if so, are there any solutions I could try? I was hoping to use GNU Radio 
to test out a new antenna I built soon, so if anyone has any advice about this, 
again I would really appreciate hearing it!

Many thanks in advance!


From: Discuss-gnuradio 
<discuss-gnuradio-bounces+orionnebula42=outlook....@gnu.org> on behalf of Glen 
Langston <glen.i.langs...@gmail.com>
Sent: Friday, February 23, 2018 7:01 AM
To: Marcus D. Leech
Cc: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] RTL-SDR device failed to open in flowgraph

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  
block.   The modified .grc file works right away.


On Thu, Feb 22, 2018 at 11:36 PM, Marcus D. Leech 
<mle...@ripnet.com<mailto:mle...@ripnet.com>> 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; 

gr-osmosdr c653754d (0.1.5git) gnuradio
built-in source types: file osmosdr fcd rtl rtl_tcp uhd hackrf bladerf airspy 
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,


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:



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