[linux-dvb] Bad signal with Nova-T-500

Patrick Boettcher patrick.boettcher at desy.de
Wed Sep 27 22:52:29 CEST 2006


Hi,

SNR is zero, because there is no calculation done in the dib3000mc.c for 
snr.

BER and UNC are 0, is something not working for you ?

Do not compare the "signal strength" with other cards (demodulators) on 
your system.

Patrick.


On Wed, 27 Sep 2006, pontoppidan at city.dk wrote:
> Hi,
> 
> I finally got the drivers installed for this card thanks to you guys. I 
> managed to make a channels.conf file using scandvb and it found all the 
> channels.
> 
> But when I use tzap, I get results like this:
> 
> using '/dev/dvb/adapter1/frontend0' and '/dev/dvb/adapter1/demux0'
> tuning to 714000000 Hz
> video pid 0x006f, audio pid 0x0079
> status 03 | signal 7c35 | snr 0000 | ber 001fffff | unc 00000000 |
> status 1f | signal 7c38 | snr 0000 | ber 00000000 | unc 000008dd | 
> FE_HAS_LOCK
> status 1f | signal 7c32 | snr 0000 | ber 00000000 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 7c38 | snr 0000 | ber 00000000 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 7c29 | snr 0000 | ber 00000000 | unc 0000000e | 
> FE_HAS_LOCK
> status 1f | signal 7c3d | snr 0000 | ber 00000000 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 7c22 | snr 0000 | ber 00000000 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 7c1e | snr 0000 | ber 000000c0 | unc 00000000 | 
> FE_HAS_LOCK
> 
> I have used the card with Windows and had very good reception on this mux as 
> well as other muxes with far worse signal (I have several roof antennas, and 
> some channels/muxes are on amplified frequencies - like the one above - 
> while others are not amplified. In Windows (dvbviewer) I can watch them all).
> 
> If I run tzap for one of the "bad" channels, ber goes up but the snr is 
> still 0000.
> 
> The output above is for adapter1, but it's exactly the same for adapter0. I 
> also tried running dvbstream, but it just creates an empty file (this could 
> be because of a bad installation though? - I just copied the dvbstream 
> executable to /usr/bin).
> 
> Any ideas?
> 
> Regards,
> Thomas
> 
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