[mythtv-users] Loss of HD channels and others from UK Sandy Heath

John Pilkington J.Pilk at tesco.net
Mon Apr 3 13:19:10 UTC 2017


On 03/04/17 12:29, John Pilkington wrote:
> On 03/04/17 08:26, Paul M wrote:
>>
>>
>> After getting interference on recordings I did a full re-scan of
>> channels (I tend to do this once every six months anyway). Afterwards I
>> had lost the channels from the 474000000 (same if I try 4742000000 and
>> 474166000000) (BBC 1 HD et. al.) and 714000000 (ITV3 et. al.)
>> frequencies.
>>
>>
>>
>> scan-dvb can find the channels on 474000000 if I use QAM64 but not
>> QAM256 but tzap doesn’t get a lock on them. scan-dvb finds the channels
>> on 714000000 and Myth enters the frequency into the database if I do a
>> manual scan but finds no channels.
>>
>>
>>
>> I was wondering if anyone else has had a problem or has an idea on how
>> to pinpoint where the problem lies (aerial, tuners, Myth etc.) If I
>> re-tune the TV it picks up all the channels except the moved Tiny Pop
>> (can’t test the HD channels as it hasn’t got an HD tuner).
>>
>>
>>
>> I am using Myth 0.27/fixes (latest build) on Gentoo with a 3.18 kernel.
>> Tuners are a PCTV 290e (for the HD channels) and Hauppage Nova-T 500.
>> Info for Sandy Heath transmitter
>> https://ukfree.tv/transmitters/tv/Sandy_Heath
>>
>>
>>
>> Thanks for any help.
>>
>>
>>
>> Paul
>
> I did a full retune for Sandy Heath three weeks ago using a PCTV290e
> with 'buntu 0.28-fixes.  The lower-frequency channels were ok - and that
> includes the PSB3 BBC ONE etc HD mux.  I use the Transport Editor to set
>  8 MHz B/W, DVB-T2 and QAM256 for that; the driver used not to
> autodetect. But I rarely record HD, so might not have noticed a problem.
>
> There were changes to accommodate non-auto-switching DVB-T/T2 tuners
> some time ago that did give problems.  I would expect them to have
> shaken out by now, but perhaps not for your builds.
>
> I don't have access to that system at present, so I'm afraid I can't run
> any tests.
>
> John P

Another possibility is that your scan wasn't using the DVB-T2 capable 
tuner.   'dmesg | grep adapter' should identify them, and myth lets you 
select.





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