Moin moin, I've just learned that effective 24.Feb, there will be a change made to the channel assignment in the area of Hamburg. This is due to the fact that one existing multiplex is found within the VHF band, which is in the process of being cleared of DVB-T services, moving them to assigned UHF channels, in order to free the VHF band for radio services (DAB/DAB+ and family). Several other areas, such as Bayern, currently make use of VHF frequencies at several transmitter sites. I am not yet aware of what plans exist to change these frequencies... The following diff will add the newly assigned frequency, and remove the old one, with an effective date of 24.Feb. The particular modulation parameters are not confirmed, so I've had to guess based on existing values used elsewhere in the NDR coverage area as well as what generally is used throughout germany. In particular, for the public service broadcasters' multiplexes, they generally seem to use a FEC of 3/4 in the 7MHz VHF band, but the more rugged 2/3 in 8MHz UHF channel space to compensate for the poorer propagation while keeping comparable bitrate available. Ideally, this would be confirmed after the switch, or in some technical document which I haven't searched out. --- /lost+found/CVSUP/SRC/HG-src/dvb-apps/util/scan/dvb-t/de-Hamburg 2008-08-23 10:18:28.000000000 +0200 +++ /tmp/de-Hamburg 2009-01-23 17:42:54.029209331 +0100 @@ -1,6 +1,5 @@ -# DVB-T Hamburg +# DVB-T Hamburg (ab 24.02.2009 CH09->CH54) # T freq bw fec_hi fec_lo mod transmission-mode guard-interval hierarchy -T 205500000 7MHz 3/4 NONE QAM16 8k 1/8 NONE # CH09: NDR, WDR, MDR, Bayrisches Fernsehen T 490000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE # CH23: ZDF, Info/3sat, Doku/KiKa T 498000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE T 514000000 8MHz 3/4 NONE QAM16 8k 1/4 NONE #ARD, MDR S-Anhalt, NDR MV, NDR SH, rbb Berlin @@ -10,6 +9,7 @@ T 602000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE T 626000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE # CH40: RTL Television, RTL2, Super RTL, VOX T 674000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE # CH53: HH1, Eurosport, Terra Nova, Neun Live +T 682000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE # CH54: NDR, WDR, MDR, Bayrisches Fernsehen T 738000000 8MHz 3/4 NONE QAM16 8k 1/4 NONE #ZDF, Doku/KiKa, Info/3sat T 754000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE # CH56: NDR, MDR, WDR, hr T 786000000 8MHz 2/3 NONE QAM16 8k 1/4 NONE Note that I am using the existing file, which to my eyes may contain errors -- it certainly includes more than just the frequencies used by transmitters in Hamburg, and the values I have on my receiver are more than a year old so I haven't compared against that. However, I'm concerned by the duplication of ZDF, particularly with a different FEC. I can confirm from the ZDF teletext info that channel 23 is in use at two transmitter sites, but I see nowhere in the general vicinity of HH where channel 54 is in use by ZDFmobil from that source. Similarly the appearance of ARD and NDR duplicates at channel 26 with similar FEC raises my eyebrows. If anything this would be spillage from, say, S-H. And channels such as TerraNova are long since history, but the multiplex technical parameters are probably unchanged. No matter... thanks, barry bouwsma _______________________________________________ linux-dvb users mailing list For V4L/DVB development, please use instead linux-media@xxxxxxxxxxxxxxx linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
