Mailing List archive
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[linux-dvb] Re: Developments with DVB-T in the UK
On Thursday 04 July 2002 19:17, steved-linux-dvb@daviesfam.org wrote:
> On the technical side there seems to be lots of support to move from 64QAM
> to 16QAM modulation to improve signal reach and stability. Looks like its
> going that way.
For those living in London (i.e. using the Crystal Palace transmitter), there
are currently tests on the old multiplex B, C and D frequencies (529833KHz,
578166KHz and 537833KHz) using a variety of parameters:
B - 2K, 16_QAM, FEC_3_4
C - 8K, 64_QAM, FEC_2_3
D - 8K, 16_QAM, FEC_3_4
Each multiplex is broadcasting a copy of BBC1, (labelled TEST1, TEST2 and
TEST3) and two other "DTG" test channels.
My Nokia DVB-T receiver only finds TEST1 when doing a channel scan, it can't
tune in to the 8K multiplexes. The Nova-t card has no problems with any
multiplex.
A full (technical) report on DTG's tests can be downloaded from:
http://www.dtg.org.uk/dtgactivities/published/dtt_modes_trial_report.pdf
According to this report, a switch from 64_QAM to 16_QAM is the same as
quadrupling the transmitter power (but with a 2/3rds reduction in capacity).
Dave.
--
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.
Home |
Main Index |
Thread Index