[linux-dvb] Updated scan file for uk-EmleyMoor

[linux-dvb] Updated scan file for uk-EmleyMoor

[Philip Pemberton]

Here's a scan file for Emley Moor with the correct frequencies and tuning 
parameters... Seems the one in the linux-dvb distribution has frequencies with 
a -133kHz or so offset, and without the correct QAM parameters. Probably my 
fault, because IIRC I submitted that tuning file...

Data sourced from www.ukfree.tv, and works fine on my HVR-3000.

# Emley Moor, West Yorkshire
# T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
T 626000000 8MHz 2/3 3/4 QAM64 2k 1/32 NONE
T 650000000 8MHz 2/3 3/4 QAM64 2k 1/32 NONE
T 674000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
T 698000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
T 706000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
T 722000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE


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Re: [linux-dvb] Updated scan file for uk-EmleyMoor

[David Matthews]

Philip Pemberton wrote:
> Here's a scan file for Emley Moor with the correct frequencies and tuning 
> parameters... Seems the one in the linux-dvb distribution has frequencies with 
> a -133kHz or so offset, and without the correct QAM parameters. Probably my 
> fault, because IIRC I submitted that tuning file...
> 
> Data sourced from www.ukfree.tv, and works fine on my HVR-3000.
> 
> # Emley Moor, West Yorkshire
> # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
> T 626000000 8MHz 2/3 3/4 QAM64 2k 1/32 NONE
> T 650000000 8MHz 2/3 3/4 QAM64 2k 1/32 NONE
> T 674000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
> T 698000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
> T 706000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
> T 722000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE

Have you looked at the Ofcom site?  You may find that the current 
frequencies are actually correct.  Apparently all the transmitters at 
Emley Moor have a 166kHz offset, either + or - depending on the channel.
See 
http://www.ofcom.org.uk/static/reception_advice/dtt_pocket_guide_3_0.pdf 
which lists all the UK transmitters and their offsets.

www.ukfree.tv seems to ignore the offset and just include the base 
channel number.  Generally it doesn't matter since the bandwidth of the 
tuner will be more than sufficient.  Of course, it would be a good idea 
to fix the QAM parameters if they're wrong.

David

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Re: [linux-dvb] Updated scan file for uk-EmleyMoor

[Christoph Pfister]

Am Freitag 07 März 2008 schrieb Philip Pemberton:
> Here's a scan file for Emley Moor with the correct frequencies and tuning
> parameters... Seems the one in the linux-dvb distribution has frequencies
> with a -133kHz or so offset, and without the correct QAM parameters.

http://linuxtv.org/hg/dvb-apps/file/be328ab0f32f/util/scan/dvb-t/uk-EmleyMoor 
is correct.

> Probably my fault, because IIRC I submitted that tuning file...
>
> Data sourced from www.ukfree.tv, and works fine on my HVR-3000.
>
> # Emley Moor, West Yorkshire
> # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy
> T 626000000 8MHz 2/3 3/4 QAM64 2k 1/32 NONE
> T 650000000 8MHz 2/3 3/4 QAM64 2k 1/32 NONE
> T 674000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
> T 698000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
> T 706000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE
> T 722000000 8MHz 3/4 3/4 QAM16 2k 1/32 NONE

Christoph

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Re: [linux-dvb] Updated scan file for uk-EmleyMoor

[Philip Pemberton]

David Matthews wrote:
> Have you looked at the Ofcom site?  You may find that the current 
> frequencies are actually correct.  Apparently all the transmitters at 
> Emley Moor have a 166kHz offset, either + or - depending on the channel.

I've been made aware of the updated version in Hg... The version that got into 
Fedora 8 is utterly hopelessly wrong though. Frequency offsets are 'sort of' 
right, but the modulation mode and FEC settings are out in the woods for a few 
muxes.

> www.ukfree.tv seems to ignore the offset and just include the base 
> channel number.  Generally it doesn't matter since the bandwidth of the 
> tuner will be more than sufficient.  Of course, it would be a good idea 
> to fix the QAM parameters if they're wrong.

What I found odd was that my Freecom USB stick wouldn't lock to the frequency 
if the offset had been added/subtracted already. The Hauppauge Nova-TD stick's 
first tuner (MMCX? connector -- the little ~3mm thing) doesn't mind, but the 
second tuner starts losing muxes if the frequency is strong.

What's odd is the first tuner sees more on Linux than it does on Windows, and 
both tuners see different things, and on Windows both tuners see the same, but 
don't pick up Film4 (698MHz, C49, Mux D). I find this odd because by all 
rights Mux A (650MHz, C43) should be disappearing as it's the weakest... this 
would seem to rule out signal strength issues. In fact, wiring up a masthead 
amplifier just made scandvb spit out "WARNING: filter pid timeout" without 
finding any channels.

Most peculiar.

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Re: [linux-dvb] Updated scan file for uk-EmleyMoor

[Philip Pemberton]

Philip Pemberton wrote:
> rights Mux A (650MHz, C43) should be disappearing as it's the weakest... this 

UKFreeTV is wrong again.. Mux D should be disappearing first, because it most 
certainly IS the weakest at only 4kW ERP vs. the 10kW ERP of the other muxes...

Grr..

My point still stands though - why should one tuner pick up a different set of 
muxes when both are fed from the same signal?

-- 
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lists@philpem.me.uk           | (='.'=) into your signature to help him gain
http://www.philpem.me.uk/     | (")_(") world domination.

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