Page 1 of 2

Cannot Access RTL Device

Posted: Fri Dec 30, 2016 11:34 am
by netwodau
I have followed the instructions at http://www.rtl-sdr.com/rtl-sdr-quick-start-guide/ to install software for use with my new RTL_SDR Receiver R820T2. The rsdll.dll file as well as zadig.exe installed fine, and I am able to select RTL-SDR(USB) as the source in the SDR# program. However, if I hit the "Play" button nothing happens, except after about a minute, I get an error message stating "Cannot access RTL device".

If I click the configure icon, the Device is shown as Sweex DVB-T USB (2) (with other options Sweex DVB USB (0) and Generic RTL2832U OEM (1) not being selectable, and the RF Gain can also not be adjusted.

My desktop PC also has an internal Arcsoft Total Media DTV/FM/DAB PCI media card installed. Is this likely to be my problem?

Jerome

Re: Cannot Access RTL Device

Posted: Sat Dec 31, 2016 6:47 pm
by on1bes
I think there is something wrong with the driver installation of your dongle. maby you choose the wrong setting in Zadig. Double check first if you have select the right device in Zadig: Device USB\VID_0BDA and PID_2838 must be listed. If this is correct, start your Harware device manager, en see what happens if you run Zadig: For DVB-T TV applications, you see you your dongle in " Control for Audio, Video and Games", and AFTER run Zadig , your dongle is an extra USB Devive. Not in on BOTH folders !. Is this is not the case, you can not control the settings in RTL-SDR.

Re: Cannot Access RTL Device

Posted: Sun Jan 01, 2017 5:59 am
by rtlsdrblog
I Googled the Sweex DVB-T stick that you have, and it looks like it has a MXL5007T tuner.

I don't think this tuner is even supported by the RTL-SDR project.

Re: Cannot Access RTL Device

Posted: Sun Jan 01, 2017 10:39 pm
by on1bes
Tuner is not supported. If that 's correct, you must have seen this in the Zadig install.

Re: Cannot Access RTL Device

Posted: Tue Dec 18, 2018 4:48 am
by curtlg
I,m lost. Running ubuntu 18.04 with GRC. Reinstalled osmosdr as per directions in User's guide. Results are

***rtl_test
[email protected]:~$ rtl_test t
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.

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...
Allocating 15 zero-copy buffers
lost at least 128 bytes
^CSignal caught, exiting!

User cancel, exiting
Samples per million lost (minimum): 11

*** run a python graph
[email protected]:~/Downloads/GNURadio-FM-Receiver-FM_RX_1a$ python fm_receiver.py
gr-osmosdr v0.1.4-127-g4d83c606 (0.1.5git) gnuradio 3.8tech-preview-144-g3359d67e
built-in source types: file fcd rtl_tcp rfspace redpitaya
Traceback (most recent call last):
File "fm_receiver.py", line 237, in <module>
main()
File "fm_receiver.py", line 231, in main
tb = top_block_cls()
File "fm_receiver.py", line 146, in __init__
self.rtlsdr_source_0 = osmosdr.source( args="numchan=" + str(1) + " " + '' )
File "/usr/local/lib/python2.7/dist-packages/osmosdr/osmosdr_swig.py", line 1330, in make
return _osmosdr_swig.source_make(*args, **kwargs)
RuntimeError: No supported devices found (check the connection and/or udev rules).
^C

***gqrx works fine
[email protected]:~/Downloads/GNURadio-FM-Receiver-FM_RX_1a$ gqrx
linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.010.003.000-0-unknown

Controlport disabled
No user supplied config file. Using "default.conf"
gr-osmosdr v0.1.x-xxx-xunknown (0.1.5git) gnuradio 3.7.11
built-in source types: file osmosdr fcd rtl rtl_tcp uhd plutosdr miri hackrf bladerf rfspace airspy airspyhf soapy redpitaya
FM demod gain: 3.05577
Resampling audio 96000 -> 48000
IQ DCR alpha: 1.04166e-05
Using audio backend: auto
BookmarksFile is /home/curtlg/.config/gqrx/bookmarks.csv
getDeviceList : Available input devices:
"Realtek RTL2838UHIDIR SN: 00000001"

Re: Cannot Access RTL Device

Posted: Wed Dec 19, 2018 1:18 am
by rtlsdrblog
curtlg wrote:
Tue Dec 18, 2018 4:48 am
I,m lost. Running ubuntu 18.04 with GRC. Reinstalled osmosdr as per directions in User's guide. Results are

***rtl_test
[email protected]:~$ rtl_test t
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
[R82XX] PLL not locked!
Sampling at 2048000 S/s.

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...
Allocating 15 zero-copy buffers
lost at least 128 bytes
^CSignal caught, exiting!

User cancel, exiting
Samples per million lost (minimum): 11

*** run a python graph
[email protected]:~/Downloads/GNURadio-FM-Receiver-FM_RX_1a$ python fm_receiver.py
gr-osmosdr v0.1.4-127-g4d83c606 (0.1.5git) gnuradio 3.8tech-preview-144-g3359d67e
built-in source types: file fcd rtl_tcp rfspace redpitaya
Traceback (most recent call last):
File "fm_receiver.py", line 237, in <module>
main()
File "fm_receiver.py", line 231, in main
tb = top_block_cls()
File "fm_receiver.py", line 146, in __init__
self.rtlsdr_source_0 = osmosdr.source( args="numchan=" + str(1) + " " + '' )
File "/usr/local/lib/python2.7/dist-packages/osmosdr/osmosdr_swig.py", line 1330, in make
return _osmosdr_swig.source_make(*args, **kwargs)
RuntimeError: No supported devices found (check the connection and/or udev rules).
^C

***gqrx works fine
[email protected]:~/Downloads/GNURadio-FM-Receiver-FM_RX_1a$ gqrx
linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.010.003.000-0-unknown

Controlport disabled
No user supplied config file. Using "default.conf"
gr-osmosdr v0.1.x-xxx-xunknown (0.1.5git) gnuradio 3.7.11
built-in source types: file osmosdr fcd rtl rtl_tcp uhd plutosdr miri hackrf bladerf rfspace airspy airspyhf soapy redpitaya
FM demod gain: 3.05577
Resampling audio 96000 -> 48000
IQ DCR alpha: 1.04166e-05
Using audio backend: auto
BookmarksFile is /home/curtlg/.config/gqrx/bookmarks.csv
getDeviceList : Available input devices:
"Realtek RTL2838UHIDIR SN: 00000001"
Something is wrong with your GNU Radio install, it's not seeing the osmosdr drivers:

built-in source types: file fcd rtl_tcp rfspace redpitaya

It should show RTL-SDR there if it's installed properly.

From what I see, you have two different versions of GNU Radio installed. You have 3.8, AND 3.7.11. That is probably the root cause of your issues.

Re: Cannot Access RTL Device

Posted: Wed Dec 19, 2018 9:33 pm
by curtlg
I remove the de version of gnu-radio

ii gnome-video-vef 0.4.3-1ubunt all Collection of GStreamer effects
ii gnupg 2.2.4-1ubunt amd64 GNU privacy guard - a free PGP re
ii gnupg-agent 2.2.4-1ubunt all GNU privacy guard - cryptographic
ii gnupg-l10n 2.2.4-1ubunt all GNU privacy guard - localization
ii gnupg-utils 2.2.4-1ubunt amd64 GNU privacy guard - utility progr
ii gnupg2 2.2.4-1ubunt all GNU privacy guard - a free PGP re
ii gnuradio 3.7.11-10 amd64 GNU Radio Software Radio Toolkit
ii google-chrome- 70.0.3538.77 amd64 The web browser from Google
ii google-earth-p 7.3.0.3830-r amd64 Explore, search and discover the

Nice guess but not success. Results are as posted earlier. Should I reinstall gnuradio???

Re: Cannot Access RTL Device

Posted: Fri Dec 21, 2018 1:49 am
by curtlg
I reinstalled GNU Radio. Same results. Built the bootable DVD. It doesn't work either. RTL_test works. gqrx fails. SDR# works.

Re: Cannot Access RTL Device

Posted: Fri Dec 21, 2018 4:35 am
by rtlsdrblog
curtlg wrote:
Fri Dec 21, 2018 1:49 am
I reinstalled GNU Radio. Same results. Built the bootable DVD. It doesn't work either. RTL_test works. gqrx fails. SDR# works.
Maybe try asking the devs or GNU Radio experts on the mailing list https://lists.gnu.org/mailman/listinfo/discuss-gnuradio.

I'm fairly certain its a version issue with the double install. Sometimes even after uninstalling one version there are bits left over that mess with the install. Hopefully the experts on the mailing list can guide you into cleaning your install up.

Re: Cannot Access RTL Device

Posted: Fri Dec 21, 2018 7:12 pm
by curtlg
These are the only 2832 rtl-sdr's in rules.d

# original RTL2832U vid/pid (hama nano, for example)
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2832", MODE:="0666"

# RTL2832U OEM vid/pid, e.g. ezcap EzTV668 (E4000), Newsky TV28T (E4000/R820T) etc.
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", MODE:="0666"

Does this match your dongle?