[linux-dvb] Re: Tuning Nebula card to Saddleworth UK transmitter

[Jukka Tastula <jukka.tastula@kotinet.com>]

On Tuesday 21 September 2004 21:10, Carey wrote:

> Which i'm guessing means that i'm looking at the wrong frequencies. I
> randomly tried ./scan dvb-t/uk-BlackHill and that does seem to pick up
> something which looks like a faint WinterHill signal. Anyway i've output
> that to a channels.conf with about 10 lines in it like those below..

That makes sense as Black Hill appears to be transmitting BBC on channel 41 
but that's ITV mux on Saddleworth. I don't live in the UK so I'm pulling 
this stuff out of my ... based on the chart's channel numbers (who ever 
thought it'd be a good idea to have Hz accuracy on these frequencies? kind 
of hard to remember don't you think?) you _might_ have some luck with one 
of these (constellation and fec_hi should be autodetected by most if not 
all cards anyway)

T 682000000 8MHz 3/4 NONE QAM16 2k 1/32 NONE
T 682000000 8MHz 2/3 NONE QAM64 2k 1/32 NONE
T 682000000 8MHz 2/3 NONE QAM16 2k 1/32 NONE
T 682000000 8MHz 3/4 NONE QAM64 2k 1/32 NONE

That should be the bbc mux and I'm guessing it's supposed to be able to 
find the other transponders based on that. The frequency isn't exactly 
accurate as I can't possibly guess that. The other frequencies should be 
634 (itv & c4), 658 (A), 714 (B) , 618 (C) and 738MHz (D). Again I'm just 
guessing based on the UHF channel number. Looking at the numbers I get the 
feeling you might need to add ~170khz but for me at least the nebula can 
find the transponder even if I tune 500khz wrong frequency, it just takes 
a second or two longer.

If tuning to those frequencies doesn't work or destroys your tv card I 
can't be held responsible. 


> status 1f | signal 0000 | snr 0000 | ber 00000000 | unc 00000000 | 
FE_HAS_LOCK status 1f | signal 0000 | snr 0000 | ber 00000000
> | unc 00000000 | FE_HAS_LOCK status 1f | signal 0000 | snr 0000 | ber
> 00000000 | unc 00000000 | FE_HAS_LOCK status 1f | signal 0000 | snr 0000
> | ber 00000000 | unc 00000000 | FE_HAS_LOCK status 1f | signal 0000 |
> snr 0000 | ber 00000000 | unc 00000000 | FE_HAS_LOCK
> Which looks like it is a lock , i'm told that Signal 0000 thing is not a
> problem?

Lock is a lock. Nebula doesn't report any other values. I have no idea if 
it is a hardware or driver thing. Either way why would anyone care? 
Picture and sound comes out perfectly and that's what these cards are for.

> thinks I have maybe not got the card configured right. Apologies for the
> slightly bloated post, I wanted to get all the info in. Nothing worse
> than a noob with a problem and no info to work on! :) cheers

Right. Bloated posts shouldn't bother anyone, just don't do it in HTML. 
It's ugly and incompatible.