[linux-dvb] Re: LGDT3302 stuff

Patrick Boettcher patrick.boettcher at desy.de
Wed Jun 29 22:44:59 CEST 2005


Hi,

On Wed, 29 Jun 2005, Michael Krufky wrote:
> I got result codes 0x08 and 0x09 while scanning QAM256 from cable.  I told 
> you about these in a previous email, where you explained to me the following:
>
> 	FE_HAS_SIGNAL     = 0x01,   /*  found something above the noise level 
> */
> 	FE_HAS_CARRIER    = 0x02,   /*  found a DVB signal  */
> 	FE_HAS_VITERBI    = 0x04,   /*  FEC is stable  */
> 	FE_HAS_SYNC       = 0x08,   /*  found sync bytes  */
> 	FE_HAS_LOCK       = 0x10,   /*  everything's working... */
> 	FE_TIMEDOUT       = 0x20,   /*  no lock within the last ~2 seconds */
> 	FE_REINIT         = 0x40    /*  frontend was reinitialized, 
> ...so this means that in many cases I am finding something above the noise 
> level, and in some cases I am also finding sync bytes.... This is the best I 
> got so far...
>
> It has just occurred to me that I need to change the scanning frequencies in 
> the atscscan program in order for it to handle US ATSC/QAM256 ... Can you 
> advise on how to do so?

Not the frequencies in the atscan-program, but in a (new) 
initial-tuning-data file.

Eg: us-ATSC-cable-frequencies-QAM256 should contain several lines like 
this

A  57028615 QAM256

whereas 57028615 must be a correct frequency for ATSC cable. I don't now 
anything about that, except that link Mac posted some time ago. 
http://www.jneuhaus.com/fccindex/cablech.html

Additionally, which is untested (no one ever reported success) in ATSC 
cable the Virtual Channel Table is carried under a different table_id 
(0xc8 for terrestrial and 0xc9 for cable). That's why you have to set the 
parameter -A to "2" to make it fetch the correct table.

So

"atscscan -A 2 us-ATSC-cable-frequencies-QAM256"

should eventually work for you...

Patrick.

--
   Mail: patrick.boettcher at desy.de
   WWW:  http://www.wi-bw.tfh-wildau.de/~pboettch/




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