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DAB Outdoor Antenna
In an area where DAB signals are weak, it will be
necessary to use an outdoor DAB antenna. There
are two main types available.
Dipole:
For use in marginal signal areas. This type of
antenna is omnidirectional and should increase the
strength of all DAB stations being received.
Multi-element antenna:
Also for use in marginal or poor signal areas. This
type of antenna is directional and has high gain.
This antenna needs to be pointed at the transmitter
you want to listen to.
< It is possible to use a TV or FM antenna with your
DAB tuner as this is normally mounted externally.
This may give a stronger signal than a simple
internal antenna, however it would not be tuned
specifically for DAB reception.
You would need to change the plug on your TV/FM
antenna to an F type, and it may also be necessary
to use a signal booster to enhance the signal.
Multi-element antenna
Dipole
About DAB
With this unit you can receive and listen to Digital
Audio Broadcast (DAB) programmes. DAB uses digital,
not analogue signals, resulting in near CD-quality
audio with virtually interference-free reception. Along
with superior quality audio, DAB can also deliver
additional audio channels and text. In the future,
computer data and images are also possible.
Digital radio is broadcast as groups of data called
ensembles or multiplexes. Each multiplex can contain a
number of stations (services) and each station contains
a primary service and can contain secondary services
as illustrated in the following diagram.
Each multiplex is transmitted in a set frequency range
and received by this unit for decoding. You can receive
multiplexes broadcast in the 174-240 MHz frequency
band and store the services in each multiplex for you
to access. The number of multiplexes you receive
depend on your location. Channels used in the UK are
in the range 10A to 12D.
Multiplexes and stations have labels (names) that are
used to identify them. Instead of needing to know the
particular frequency of your favourite broadcast, you
can simply select the station name. Secondary services
and additional data such as text or multiplex info are
also available.
DAB SIGNAL
MULTIPLEX
PRIMARY
SERVICES
SECONDARY
SERVICES
Parliament
BBC Radio 4
BBC
National
DAB
1
1
2
3+
1
2
3
4+