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Teletext requires a very good signal to operate without 'glitches'.
Although your picture may appear to be ok, the signal may not be as
clean as you expect. Teletext signal strength and clarity can easily
be observed by looking at the clock in the top right hand corner. If
this clock is jumping about then the signal is not as good as it needs
to be. If this occurs, have your antenna checked and repositioned to
obtain optimum performance if necessary.
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