TerraTec Cinergy DT USB XS Diversity: Difference between revisions
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'''Update: 19.11. 2007''' |
'''Update: 19.11. 2007''' |
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Tuners using the dvb-usb-dib0700 module may be unable to tune to a particular channel multiplex while receiving others just fine. This appears to be a fairly common problem that is caused by some sort of amplifier setting not getting used when it should |
Tuners using the dvb-usb-dib0700 module may be unable to tune to a particular channel multiplex while receiving others just fine. This appears to be a fairly common problem that is caused by some sort of amplifier setting not getting used when it should; look for lines with "filter timeout" when running 'scan', if you are missing all channels of a particular multiplex. |
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In short, if experiencing this problem, try setting the following (in /etc/modprobe.d/options or /etc/modules.conf): |
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Revision as of 10:01, 19 November 2007
A DVB-T USB device from TerraTec.
subsystem ID: 005a:0ccd
features two tuners, and have two antennas. You'll have adapter0 and adapter1 in /dev/dvb, which you can use separately.
The "Diversity" option is a hardware based feature that allows for the device's two receivers to be configured in a combined use mode to achieve better reception on a single channel. The diversity feature of the DiBcom demodulators is currently not implemented in the Linux-DVB drivers, so only the dual tuner configuration is presently supported on such devices [1].
It seems that either this tuner stick does not have a very sensitive tuner, or the small antennas that come with it are simply insufficient for real-life use, unless one lives next door to a broadcast tower and has a direct line-of-sight to it. It is thus likely that an external antenna with a builtin amplifier is needed when this tuner is used.
User experiences
Date: 22.8. 2007
Distro: Ubuntu Feisty, AMD64
Kernel: 2.6.20-16-generic
The drivers shipping with Feisty are not recent enough, so installed the current v4l-dvb distribution ([2]. It can be downloaded through Mercurial's web interface (see 'bz2' & 'gz'). Otherwise, you'd have to install & use Mercurial to fetch the source.
Downloaded the new dvb-usb-dib0700-03-pre1.fw firmware from [3] & copied it to /lib/firmware (if that does not work, flash the stick with the latest firmware from Terratec on a Windows PC).
After these steps, the stick works - I was able to find channels & get TV out of them.
Update: 19.11. 2007
Tuners using the dvb-usb-dib0700 module may be unable to tune to a particular channel multiplex while receiving others just fine. This appears to be a fairly common problem that is caused by some sort of amplifier setting not getting used when it should; look for lines with "filter timeout" when running 'scan', if you are missing all channels of a particular multiplex.
In short, if experiencing this problem, try setting the following (in /etc/modprobe.d/options or /etc/modules.conf):
dvb_usb_dib0700.force_lna_activation=1
After the module has been reloaded, you might be able to find and view the missing channels :-) You can check /sys/module/dvb_usb_dib0700/parameters/force_lna_activation on your system to make sure the parameter has been set.
Finally, this stick works just fine on 32-bit Ubuntu Gutsy as well.
(note: the following is likely dated by now)
openSUSE 10.2 (i586) Kernel 2.6.22.1-ccj51-default
Compiling the driver vv4.tgz from http://www.chez.com/treza/mt2266.htm
(on my system a netdevice.h was needed in /lib/modules/2.6.22.1-ccj51-default/build/include/linux)
Copying the firmware dvb-usb-dib0700-01.fw to /lib/firmware
Reboot, connect the stick, kaffeine, enjoy.