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NooElec NESDR SMArt - Error: Cannot access RTL device

Posted: Tue Jan 30, 2018 5:31 pm
by jullit31
Hello,

I'm currently trying to use SDR# on Win10 pro x64 with a NooElec NESDR SMArt. So far I downloaded and unzipped SDR# and ran the install-rtlsdr.bat and zadig.exe. Everything completed whithout any errors.
zadig.JPG
zadig.JPG (67.77 KiB) Viewed 4737 times
When I start SDR#, the device is recognised correctly:
sdrsharp.JPG
sdrsharp.JPG (63.58 KiB) Viewed 4737 times
However, I cannot move the RF Gain slider. A few seconds after pressing Start i get a Cannot access RTL device error pop-up.
I tried this several times on two PCs with USB 2.0 and 3.0 ports, always with the same result. Of course I also rebooted. What am I missing? (I'm new to SDR, so it may be something so obvious that it's never mentioned...)

Thanks in advance, Julian

Re: NooElec NESDR SMArt - Error: Cannot access RTL device

Posted: Tue Jan 30, 2018 10:15 pm
by rtlsdrblog
Drivers look okay. If it's happening on two separate PCs then it might be a hardware fault.

One thing to try first might be to disable Windows automatic driver updates. Sometimes this can break things.

Also double check the rtlsdr.dll is inside the SDR# folder.

Re: NooElec NESDR SMArt - Error: Cannot access RTL device

Posted: Wed Jan 31, 2018 6:10 pm
by hotpaw2
I also helps to have more than one RTL device available to test, to see if the problem is with software or with hardware. I had one of the smaller NooElec devices get hot and fail.

Re: NooElec NESDR SMArt - Error: Cannot access RTL device

Posted: Thu Feb 01, 2018 5:27 pm
by jullit31
rtlsdrblog wrote:
Tue Jan 30, 2018 10:15 pm
One thing to try first might be to disable Windows automatic driver updates. Sometimes this can break things.
Also double check the rtlsdr.dll is inside the SDR# folder.
Tried and checked, to no avail...

I also tried installing it on Ubuntu 16.04 following these instructions. Running rtl_test gave me:

Code: Select all

[email protected]:~$ rtl_test
Found 1 device(s):
0: Generic, RTL2832U, SN: 77771111153705700

Using device 0: Generic RTL2832U
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
No supported tuner found
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
Enabled direct sampling mode, input 1
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
Supported gain values (1): 0.0
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9
WARNING: Failed to set sample rate.
rtlsdr_demod_write_reg failed with -9
rtlsdr_demod_read_reg failed with -9

Info: This tool will continuously read from the device, and report if
samples get lost. If you observe no further output, everything is fine.

Reading samples in async mode...
^CSignal caught, exiting!

User cancel, exiting...
Thanks for your help, I guess I'll contact NooElec now...

Re: NooElec NESDR SMArt - Error: Cannot access RTL device

Posted: Fri Mar 02, 2018 10:24 pm
by tim_rtd
I know its been a month ago you made your entry.
Whenever I see that reg read /write stuff on rtl_test. To me , it means you've got low voltage getting to the dongle.
Plug it into an active usb hub.
I've seen this a few times...always the fix