[linux-dvb] Re: Problems with a DVB-T

[Holger Waechtler <holger@convergence.de>]

Ragnar Sundblad wrote:
> 
> Hello all,
> 
> I finally got my hands on a TT DVB-T card via dvb-shop.
> 
> I am having big problems with it though, and I would really
> appreciate some help and input.
> 
> I have tried using it with both the latest CVS driver and
> the technotrend windows software with the same result:
> I get a somewhat correct picture in about the upper half
> and mostly noice (blocks) in the lower half. The somewhat
> correct upper part is jerky with a few updates every second.
> It looks the same on the composite output and on the
> windows software screen picture.
> 
> When I run tzap it looks like this:
> using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> tuning to 730000000 Hz
> status 17 | signal 4c4c | snr 0000 | ber 00000076 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 4c4c | snr 0000 | ber 00000060 | unc 00000000 | 
> FE_HAS_LOCK
> status 01 | signal 4c4c | snr 0000 | ber 00000054 | unc 00000000 |
> status 17 | signal 4c4c | snr 0000 | ber 0000014d | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 4c4c | snr 0000 | ber 0000003b | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 4c4c | snr 0000 | ber 00000072 | unc 00000000 | 
> FE_HAS_LOCK
> status 17 | signal 4c4c | snr 0000 | ber 00000053 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 4c4c | snr 0000 | ber 00000058 | unc 00000000 | 
> FE_HAS_LOCK
> status 1f | signal 4c4c | snr 0000 | ber 00000061 | unc 00000000 | 
> FE_HAS_LOCK
> status 01 | signal 4d4c | snr 0000 | ber 00000062 | unc 00000000 |
> status 17 | signal 4c4c | snr 0000 | ber 000000a9 | unc 00000000 | 
> FE_HAS_LOCK
> 
> which doesn't look very stable to me.
> 
> I have tried some different settings for FEC and guard interval and
> other parameters (neither of which I really understand) to no avail.
> 
> When the card is booting there are jagged stripes on the video output
> for a few seconds, like some random memory contents. Is this normal?
> 
> The card is rev 1.2, recently bought from dvb-shop and has a TDLB7
> and the infamous SP8870 (which seems to be made '99, other chips
> are 2002). There seems to be solder bridges between legs of the
> SP8870 in several places. I don't know if that is intended or not.
> I have searched for the SP8870 on the web but haven't been able to
> find a spec or pinout, so I can't verify the bridges.
> Does anybody out there have any information on it (I seem to recall
> that Holger said he had it?)?

Spase had some specs on their homepage for a while. I've seen that you 
can still get them on http://www.archive.org/, search the old Spase web 
site there. I don't remember the date when they published the docs, 
you'll have to find this out on your own...

Holger



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