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

[John Pilkington]

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