[linux-dvb] HVR-1800 failing to detect any QAM256 channels

Michael Krufky mkrufky at linuxtv.org
Thu May 1 05:24:45 CEST 2008


Eric Cronin wrote:
>
> On Apr 30, 2008, at 8:20 PM, Michael Krufky wrote:
>> Eric Cronin wrote:
>>>
>>> On Apr 30, 2008, at 2:36 PM, Michael Krufky wrote:
>>>
>>>>>
>>>>> Eric,
>>>>>
>>>>> When you use the scan command to scan for QAM channels, you must
>>>>> specify -a2, to signify that you are scanning digital cable.
>>>>>
>>>>> Try that -- does that work?
>>>>
>>>>
>>>> My bad -- I meant, "-A 2"  (capitol A, space, 2)
>>
>> scan -A 2 -vvv dvb-apps/util/scan/atsc/us-Cable-Standard-whatever >
>> channels.conf
>>
>> Is THAT what you're doing to scan ?
>>
>>
>> It looks like what you were doing was scan a tuned frequency for pids.
>> If you want to do THAT, then you must actually be tuned to the given
>> frequency.  you need to azap SOME_CHANNEL -r, and keep that running
>> before attempting to run 'scan -c' ...  I think you should try the scan
>> command that I mentioned above.
>>
>> HTH,
>>
>> Mike
>>
>
>
> I was only using one -v, but the scan file isn't the problem.  It is
> just the single line out of
> /usr/share/doc/dvb-utils/examples/scan/atsc/us-Cable-Standard-center-frequencies-QAM256
> corresponding to a known good frequency.  Otherwise it scans from 0-70
> which are all NTSC and gets annoying on repeated attempts...
>
> Adding two more -v's doesn't change anything, status is always 0x00
> and nothing gets written to STDOUT (channels.conf)
>
> ~$ scan -A 2 -vvv

The -v is just for verbosity.

My question should have been, "did you give it a chance to scan through
the entire scan file?

-Mike





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