ALTERNATIVE FREQUENCIES
Many programmes broadcast on the FM
waveband have a programme
identification (PI) code, which can be
recognised by audio units.
If your radio has alternative frequencies
(AF) tuning switched on and you move
from one transmission area to another, this
function will search for and switch to a
stronger station signal, if one can be found.
Under certain conditions, however, AF
tuning may temporarily disrupt normal
reception.
When selected, the unit continually
evaluates signal strength and, if a better
signal becomes available, the unit will
switch to that alternative. It mutes while
it checks a list of alternative frequencies
and, if necessary, it will search once across
the selected waveband for a genuine
alternative frequency.
It will restore radio reception when it finds
one or, if one is not found, the unit will
return to the original stored frequency. On
certain units, NOT FOUND will be shown
in the display.
With AF-MAN selected, the unit operates
in a similar way to AF-AUTO or AF-ON, but
only searches for an alternative frequency
when prompted by pressing a preset
button.
With AF-OFF selected, the original stored
frequency remains selected. In this mode,
AF-OFF will be displayed every time the
unit is turned on.
All except Sony and Sony DAB
1. Press and hold the MENU button until
the display changes.
2. Press the MENU button repeatedly
until AF is shown in the display.
3. Using the seek up or seek down button
select the required setting.
4. Press the MENU button or allow the
system to time out to confirm your
selection.
Sony and Sony DAB
1. Press the MENU button briefly.
2. Using the left or right navigation button
select the required setting.
3. Press the MENU button to confirm
your selection.
REGIONAL MODE (REG)
Regional mode (REG) controls the
behaviour of AF switching between
regionally related networks of a parent
broadcaster. A broadcaster may run a fairly
large network across a large part of the
country. At various times of the day this
large network may be broken down into a
number of smaller regional networks,
typically centred on major towns or cities.
When the network is not split into regional
variants, the whole network caries the
same programming.
Regional mode ON: This prevents 'random'
AF switches when neighbouring regional
networks are not carrying the same
programming.
Regional mode OFF: This allows a larger
coverage area if neighbouring regional
networks are carrying the same
programming, but can cause 'random' AF
switches if they are not.
All except Sony and Sony DAB
1. Press and hold the MENU button until
the display changes.
2. Press the MENU button repeatedly
until REG is shown in the display.
262
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