[mythtv-users] DVB-T scanning, still trying to get it to work.

[John Pullan]

On 18/05/06, Niels Dybdahl <Niels at dybdahl.dk> wrote:
>
> On 5/18/06, RoboJ1M <jim.neave at googlemail.com> wrote:
>
> > Hello All,
> >
> > I'm still struggling with getting my DVB-T card tuned in here in the UK.
> >
> > I'm running the latest 0.19_fixes build and I've tried all the different
> > methods, here are some of my results:
> >
> > AutoScan - Finds nothing
> > Tuned scan - Find a couple of channels, different ones
> > Scan Transports - Finds nothing ("no tables" error)
> > Import channels.conf - Works, but EIT doesn't without some SQL hacking.
> > (This would work fine, but not even dvb-utils' "scan" finds every
> > channel.
> >
>
> I also have problems with tuned scans. If I enter the frequency of one of
> the swedish transports, it does not find anything. If I enter both the
> frequency and the bandwidth it does find it.
> But if I enter the frequency and the bandwidth of the danish (I am in
> Denmark) transport, it does not find anything. It does not even show "not
> locked" and it does not complete either.
>

You probably do need to set the bandwidth.

I have the best experience with the country scan, but unfortunately there is
> no configuration for Denmark yet. Does anybody know where these country
> configurations are stored ?
>
> Niels Dybdahl
>
>
> You need to add Denmark to ScanCountry in scanwizardhelpers.* and also
define the offset table in frequencytables.cpp. If I remember correctly you
can define multiple ranges which should allow you to cope with quite complex
systems. e.g:

    // Australia
    fmap["dvbt_ofdm_au0"]         177500000, 226500000, 7000000, "", 0, INVERSION_OFF,
        BANDWIDTH_7_MHZ, FEC_AUTO, FEC_AUTO, QAM_64, TRANSMISSION_MODE_8K,
        GUARD_INTERVAL_AUTO, HIERARCHY_NONE, QAM_AUTO, 125000, 0); // VHF
6-12
    fmap["dvbt_ofdm_au1"]         529500000, 816500000, 7000000, "", 0, INVERSION_OFF,
        BANDWIDTH_7_MHZ, FEC_AUTO, FEC_AUTO, QAM_64, TRANSMISSION_MODE_8K,
        GUARD_INTERVAL_AUTO, HIERARCHY_NONE, QAM_AUTO, 125000, 0); // UHF
28-69

defines two ranges for Australia,
                      uint
_frequencyStart,                             //start
                      uint
_frequencyEnd,                              //end
                      uint
_frequencyStep,                             //step
                      QString
_name_format,                            //not used
                      int
_name_offset,                                //nor this
                      fe_spectral_inversion_t
_inversion,
                      fe_bandwidth_t          _bandwidth,
                      fe_code_rate_t          _coderate_hp,
                      fe_code_rate_t          _coderate_lp,
                      fe_modulation_t         _constellation,
                      fe_transmit_mode_t      _trans_mode,
                      fe_guard_interval_t     _guard_interval,
                      fe_hierarchy_t          _hierarchy,
                      fe_modulation_t         _modulation,
                      int
_offset1,                                        //offsets from the centre
                      int
_offset2                                         //frequency, can be zero

Try and make the paramters as specific as possible, i.e instead of
inversion_auto use inversion_off if all the mplexs have it defined as off.

Regards
-- 
John
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