[mythtv-users] UK DVB-T problems

Will egroups at klubbing.com
Fri Jan 7 16:54:33 EST 2005


No problem here, Bilsdale transmitter, AverTV 771, Duron 700, sorry!
What transmitter are you using?

Will

> 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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>> mythtv-users at mythtv.org
>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>
>>
>>
>
>
> -- 
> - Ciaran
>


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