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

Eric Cronin ecronin at gizmolabs.org
Thu May 1 16:41:54 CEST 2008


On Apr 30, 2008, at 11:24 PM, Michael Krufky wrote:
> 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
>

Yes.

Thanks,
Eric

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