|
|
|
www.southgatearc.org
|
Page last updated on:
Sunday, December 5, 2010
|
NZ Radio Hams multiplex four video and audio streamsThe data compression, inherent in all forms of digital television, permits the simultaneous transmission of many video and audio streams in the bandwidth previously occupied by one analogue television transmission. This technique is a feature of Broadcast digital television.On Saturday, the 4th of December, 2010, a group of Wellington and Hutt Valley Radio Amateurs simultaneously multiplexed four video and audio streams into one digital television transmission, using low cost equipment. The transmission was centred on 1282 MHz, in accordance with the NZART bandplan (page 4-11 of the latest Call Book), and occupied 1274 to 1290 MHz, the same bandwidth as one analogue FM television transmission. The DVB-S modulation format was used, receivable on an unmodified satellite TV set-top box. Further development and testing is planned, with the aim of transmitting the four video and audio streams within an 8 MHz bandwidth, half that used by the above tests, using the DVB-T modulation format, receivable on an ordinary Digital Terrestrial television receiver. The team was led by Doug, ZL2TAR, assisted by Gavin, ZL2TVM, Dick, ZL2TGQ and Phil, ZL2TIQ.
|
|
|||||||||||||||||||||
|
|
|
