[linux-dvb] Upcoming DVB-T channel changes for HH (Hamburg)
tobi at to-st.de
Tue Jan 27 13:09:22 CET 2009
Just had a look at your zip archive and the files.
Christoph Pfister schrieb:
> I've updated my de-files:
> - fixed the url (inserted the wrong one by accident)
> - fixed vhf channels (they were using 8mhz because my trigger was wrong)
> - add the the "# CHxy: name of programs" information
> - 563 MHz --> 562 MHz (their pdf seems to use a wrong frequency for channel 32)
You are right. 562 MHz as nominal frequency is correct, because for
DVB-T this is calculated 306 MHz + channel number x 8 MHz. VHF would be
142.5 MHz + channel number x 7 MHz.
It's just a centre frequency used for tuning purposes. The DVB-T signal
should (ideally) use a 8 MHz width space from 559.25 MHz to 567.25 MHz
for Ch 32.
> But I haven't looked at the new documents proposed in this thread yet.
I didn't compare that either. Could also be difficult, because of
different revision dates.
Looking through your files in the zip archive, it rose some questions in
a) is it really useful to have scan files by federal state (Bundesland)?
Just let me explain with an example. I live in Sachsen-Anhalt on the
north of the Harz Mountains area. To effectivly ("best") use DVB-T I do
combine both transmitters in Sachsen-Anhalt (Mt. Brocken) and from
Niedersachsen (Braunschweig). This is because some channels are only
available from a specific transmitting site (private channels only from
Braunschweig, RBB only from Brocken). The same applies to other regions
in Sachsen-Anhalt (south east will have reception from Sachsen and
Thüringen, north east from Berlin / Brandeburg etc.)
I think, this situation will also apply to other federal states.
=> I personally would prefer to stay with or alternatively provide a
region based file, so I could look up and combine the regions of
interest. What do you think?
b) Conflicting information
In your "Sachsen-Anhalt" scanfile you list on Ch 24 the ARD multiplex
T 498000000 8MHz 2/3 NONE QAM64 8k 1/4 NONE
# CH24: Das Erste, arte, Phoenix, EinsFestival
which is for a large part of Sachsen-Anhalt useless (we can't receive
that), as we actually receive on Ch 24 (from Braunschweig)
T 498000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE
# CH24: RTL, RTL II, Super RTL, VOX
=> have a look at QAM, its QAM64 in your scanfile and QAM16 for Ch24 we
=> Does it matter, e.g. would instead of the unreceivable Ch24 from
Halle-Stadt the Braunschweig Ch24 be found? (I did not test this).
c) You clearly missed out some information. I noticed for instance Ch 37
in Leipzig (Sachsen) which is the "Leipzig 1" multiplex
Please have a look at the already posted link to SLM or my homepage:
On the other hand I doubt, that it would be a useful entry into a
"Sachsen" scanfile because reception is limited to the area of the city
As I have no overview of regional "special projects" in other area, such
omissions in the files may apply to other areas too.
Just as a sidenote and for historical purposes I may point you to:
which gives an overview how in 2003 the concept for the north of Germany
had been planned. This information is obsolete and has changed, but the
document show a bit, how decisions evolved in consideration of federal
state and "Medienanstalt" boundaries (e.g. Bremen) etc.
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