[opendtv] Re: Broadcasters Nix Low-Power DTS Proposal

  • From: "Stessen, Jeroen" <jeroen.stessen@xxxxxxxxxxx>
  • To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 4 Feb 2010 14:40:15 +0100


Bert Manfredi wrote:

Ø  To be clear, of the successful SFNs we have looked into on this list, i.e. 
Paris, Berlin, Rome, and Sydney, and maybe even the one in NYC if it exists 
today, do any of these NOT involve at least one big stick? And that one 
assisted by one or a half-handful of smaller sticks?

Scusa ? Speaking on behalf of this little country below the sea level, we have 
one big stick, the Gerbrandy tower in Lopik: 
and since the introduction of DVB-T it is only 367 meters high anymore. 
Nederland is
flat, so it has a long reach. But if you look at the frequency plan, it emits 
only a lousy
10 kW in bouquet 1, which is where the 3+1 free-to-air public channels are 
See: http://nl.wikipedia.org/wiki/DVB-T-frequenties . Many of the lower towers 
higher power, up to 40 kW. Bouquet 1 contains one regional program, so I 
suppose that
this means that it can not be a SFN for the entire country. The other 3 
bouquets contain
the same programs for the entire country. I am not sure why this is not a 
complete SFN
then, only partially, but this may well have to do with available frequencies 
in relation
to the neighboring countries Belgium and Germany. The precise frequency 
and power figures can be viewed at: http://www.at-ez.nl/dav/index.html (= 
official data).

You can see how many (44 !) little transmitters there are everywhere, in such a 
country. And all these transmitters are managed by a single entity (Novec, with 
KPN ?).
Note that every stick broadcasts the same 22 programs, only the 1 regional 
may differ. So there is NO need to aim an antenna at 2 or more transmitter ! 
These do
not include any German channels, so very few people would point an antenna 
Germany. If you're really into foreign programs, you already have a satellite 

The coverage is optimized for the densely populated urban areas, e.g. east and 
west of
Eindhoven there are 2 transmitters of 10 kW each, using the same frequencies 
The intention is to use small active set-top (indoor) antennas, which come with 
the tuner.
There are complaints from the neigborhood around the west-side tower about 
interference into the cable TV network, which uses the same frequencies for some
popular analog channels. Apparently, a 10 kW tower in your backyard is a 
problem !

KPN/Digitenne is not trying too hard to achieve 100% coverage. The people who 
in the rural areas are kindly referred to CanalDigitaal, where they can get the 
same 22
programs (and many many more) over satellite (Astra at 19.2 and 23.5 degrees 
A little satellite beats a big stick any time. Their bit-rates are somewhat 
higher too.

And I receive both (DVB-T and DVB-S) plus analog cable (but not DVB-C).
DVB-S for the HDTV channels (1 already, soon 3, plus some foreign programs),
and DVB-T for receiving anything at all during heavy rain or snow, and because a
DVB-T / DVB-C tuner and demodulator is now standard in every new TV, so it's
also a case of why-not.

-- Jeroen

  Jeroen H. Stessen
  Specialist Picture Quality

  Philips Consumer Lifestyle
  Advanced Technology  (Eindhoven)
  High Tech Campus 37 - room 8.042
  5656 AE Eindhoven - Nederland

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