AUTO-TUNING AND CLOCK-SET
Because text packet 8/30 contains all the data on station identification, broadcaster, real time etc. it facilitates an auto set-up system in which a TV or VCR can be automatically tuned and have its clock accurately set. The auto set-up programme is initiated by the user during installation, whereupon the syscon section sweeps the tuner through all the broadcast bands for which it is equipped, stopping briefly at each transmission it encounters for download of broadcast frequency, signal strength and PDC data. When the sweep is complete all the data is analysed and sorted so that the strongest and cleanest available carriers are used, and assigned to tuning memory as 13-bit references, in order (for the UK) BBC1, BBC2, ITV, CH4, CH5 etc. so that the user’s channel selector keys call them up in that sequence.
