Teletext systems expensive cost of NABTS decoders, costing in the thousands of dollars upon their release to the public. NABTS, however, was adopted for a short while by American TV networks NBC & CBS throughout the early-to-mid 80s, CBS using it for their short-lived ExtraVision teletext service, which premiered after the early Antiope & Ceefax trials by CBS & KNXT, and NBC, who had a NABTS-based service called NBC Teletext for a very short time in the mid-1980s. NBC discontinued their service in 1985 due to the cost of NABTS decoders not dropping to an affordable level for the consumer public. The
BBC World Service 05:20am on BBC Radio 4 FM & DAB. It has always been in mono on its own DAB channel with a bit rate of just 64 kbit/s. BBC World Service can also be heard on BBC Radio Wales from 01:00am until 05:30am on MW and FM stereo. In the 1990s, the BBC purchased and constructed large medium wave and FM networks in the former Soviet bloc, particularly the Czech (BBC Czech Section), Slovak Republics (BBC Slovak Section), Poland (BBC Polish Section) (where it was a national network) and Russia (BBC Russian Service). It had built up a strong audience during