[mythtv-users] UK DVB-T problems

[Ciaran]

Sorry to jump on,  Anyone noticed any strange issues with UK-TV
History?  For me it seems as if every other video frame is skipping,
yet the audio is fine.  I don't believe its a signal issue as I can
receive most other channels just fine :) Very strange!
- ciaran


On Fri, 7 Jan 2005 11:27:44 +0000, Nick Craig-Wood <nick at craig-wood.com> wrote:
> On Thu, Jan 06, 2005 at 11:45:24PM +0000, James Fidell wrote:
> > Having managed to find a few channels from the Mendip transmitter (which
> > carries just about everything), I'm getting:
> >
> > $ tzap "BBC ONE"
> > using '/dev/dvb/adapter0/frontend0' and '/dev/dvb/adapter0/demux0'
> > tuning to 778000000 Hz
> > video pid 0x0258, audio pid 0x0259
> > status 01 | signal 1717 | snr 0000 | ber 0000ffff | unc 0000000b |
> > status 1f | signal 1616 | snr 9292 | ber 00008581 | unc 00000007 | FE_HAS_LOCK
> > status 1f | signal 1717 | snr 9090 | ber 000073c9 | unc 00000009 | FE_HAS_LOCK
> > status 1f | signal 1717 | snr 9696 | ber 0000680f | unc 0000000e | FE_HAS_LOCK
> > status 1f | signal 1717 | snr 9999 | ber 00005e70 | unc 00000009 | FE_HAS_LOCK
> > status 1f | signal 1717 | snr 8f8f | ber 00006a03 | unc 00000004 | FE_HAS_LOCK
> > status 1f | signal 1717 | snr 9292 | ber 0000639f | unc 00000007 | FE_HAS_LOCK
> >
> >
> > I'm guessing those figures really aren't good news and might explain why
> > I can't see any channels from other muxes on that transmitter?
> 
> Yes you are correct!
> 
> The mux with BBC ONE (Myx 1) in is broadcast in QAM 16 which is better
> than the QAM 64 of the other multiplexes, and is probably at higher
> power.  You have a very low signal on that so its unlikely you'll get
> the other muxes.  You are getting uncorrectable errors in the above
> which will render the video very annoying!
> 
> My worst multiplex (Mux A) has around 0x1000 correctable errors per
> second and no uncorrectable errors.  You've got about 10 times that
> many errors.  On Mux 1 I get no ber/unc at all!
> 
> Use this (sort by mux) if you want to see what channel is where
> 
>   http://homepages.enterprise.net/cavan/scripts/dtt/dtt.cgi
> 
> So, better upgrade your aerial!
> 
> --
> Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick
> 
> 
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> 


-- 
- Ciaran