[linux-dvb] Re: bad reception

[Chris Pitchford <nova-t@intrepid.cx>]

I had EXACTLY THE SAME problem....

I have a P4 (i845 abit BD7II mobo), a Matrox G450, SB Audigy thinger,
Adaptec 2940, WinTV/PVR (analog tv card) and a WinTV/Nova-T DVB card, 3com
Vortex netcard (or boomerang?)


Sometimes it would work fine for a week.. other times it would work 5
minutes then a continuous stream of errors interleaved with bits of normal
video..

PCI slots:

Matrox G450
WinTV Nova-t
WinTV PVR
Sound Blaster
SCSI 2940
3com
---bottom-of-case---

I removed the 3com network card, and compiled in support for the realtec
onboard controller (which was previously disabled in the BIOS)

and moved the TV cards around. the WinTVPVR and Nova-T both run quite
hot.. as does the G450.. not it looks like


Matrox G450
[blank/empty]
WinTV PVR
Sound Blaster
SCSI 2940
WinTV Nova-t
---bottom-of-case---


Now, using the NEWSTRUCT drivers from CVS (same software infact.. no
upgrade..) it works fine.. occasionally there is an error when watching
channel5 (but this could be channel5 reception..??? though I didn't think
it affected DVB) but all the other channels I can receive are perfect..
its the best its ever been

I seriously suggest looking at the card layout in your box, it definately
fixed mine (though perhaps it was due to interferance caused by an
adjacent card?)

as they say.. YMMV

cp


On Wed, 9 Oct 2002, Justin Cormack wrote:

> Whats the best way to diagnose rarely getting a picture?
>
> I have a dvb-t card (in the uk). The antenna is pointing pretty much
> at Crystal Palace, but I rarely get a picture for more than a few minutes,
> the rest of the time mplayer says libmpeg2 is giving sig11 and there
> are just coloured blobs (running dvbstream into ts2ps 0 0 | mplayer.
> The latest pes2vid_es | mpeg2dec doesnt sig11 but just says
> stream not demultiplexed ? almost all the time.
>
> dvbstream says:
>
> dvbstream v0.4pre3 - (C) Dave Chapman 2001
> Released under the GPL.
> Latest version available from http://www.linuxstb.org/
> Using DVB card "Grundig 29504-401"
> tuning DVB-T (in United Kingdom) to 505833000
> polling....
> Getting frontend event
> FE_STATUS:
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_CARRIER
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> Bit error rate: 672
> Signal strength: 11822
> SNR: 51143
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> Output to stdout
> Streaming 2 streams
>
> the bit error rate is usually about 1500, sometimes more - is this too high?
> And should the signal strength be higher?
>
> Unfortuantely I dont have much else except analogue tv to test the antenna
> with, though I may try to borrow an ITV digital box.
>
> Any help would be appreciated.
>
> Justin
>
>
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