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Fastext

A teletext enhancement that automatically stores specific pages in a memory for quick access via coloured-coded buttons on the TV handset.



FEC

Forward Error Correction

A technique for improving the robustness of data transmission. Excess bits are included in the outgoing data stream so that error-correction algorithms can be applied upon reception. For the satellite standard the Viterbi code combined with the Reed Solomon code is used. Commercial use of transponders makes 3/4 the code rate most used for Viterbi, which means that three out of four bits contain useable information.



Flicker-free TV

Flicker-free or 100Hz televisions improve picture quality by doubling the normal scanning rate of a TV from 50 to 100Hz to reduce picture flicker.



Footprint

Geographic area covered by a satellite transmission.



Forward path

The transmission path issued from the service provider and reaching the end user.



Free to air

Services that are free to everyone, with no need for a special decoder to receive them.



Freesat

A free-to-air digital satellite service from the BBC and ITV offering over 130 TV and radio stations.



Freeview

A national free-to-air digital terrestrial service offering over 70 TV and radio channels.



Frequency spectrum

A range of frequencies.



FST

Flat square tube

A CRT TV tube that improves picture quality by having a flatter, less rounded surface and squarer corners than conventional CRT tubes: rapidly being replaced by flat-panel technologies.


 

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