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SD200
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Multichannel distribution systems
SDM200 • RF six audio channel modulator
The SD200 system enables simultaneous
distribution of 6 different programmes over a
single pair of wires. The ease of installation as
compared with conventional systems makes it
particularly suitable for sound-broadcasting to
the single rooms of accommodation facilities
such as hotels, nursing homes, tourist centres,
residential centres, cruise ships, ferries and
private homes.
The heart of the system is the
SDM200
central unit, which ena-
bles six sound signals, generated locally by their respective sound
sources (CD players, tuners, multimedia players, etc.) to be modulated
and transmitted, mixed on a telephone pair. A pre-amplifying circu-
it controls the amplitude of the signals from the sources for correct
modulation of the relevant carriers, which are generated by a stage
that operates according to PLL technology with a quartzed reference
frequency. The six modulated carriers are sent to an RF amplifier and
then to the output sockets through an RF transformer that achieves
balancing and the correct impedance. The SDM 200 modulator is able
to supply a constant signal for a maximum of 80
SDP220
receivers.
Repeated expansion in multiples of 80 is possible by including one or
more
SDB200
amplifiers on the signal line.
SDB200 • Line amplifier
This module must be used if the length of the line attenuates the signal
excessively or, in any case, if the number of SDP220 receivers is grea-
ter than 80. Each SDB200 enables a further 80 receivers to be added.
It is possible to expand the system to a practically unlimited number of
receivers using the appropriate additional SDB200 amplifiers. For the
230 Vac mains power, it is necessary to add the SDT101 transformer.
Available in light grey colour (
SDB200
) or black colour (
SDB200-N
).
SDB200
SDB200-N
SDP220 • Amplified six channel receiver
This unit demodulates the signals distributed by the SDM200 modula-
tor. Even when the receiver is switched off, it can be activated from a
remote station, by means of a 12V control. This feature enables forcing
of emergency signals to be sent out for single receiving zones. The
module can be powered by a 12 VDC source or from the 230 VAC po-
wer mains through an SDT100 transformer contained in the SDA200-
T loudspeaker module. The channels are selected cyclically by means
of keys. The selected channel is shown on a display featuring auto-
matic brightness adjustment in relation to the ambient lighting. The
volume control is of the electronic type. It is possible to connect he-
adphones to the socket provided for this purpose. It is available in pale
grey (
SDP220
) and anthracite grey (
SDP220-N
).
SDP220
SDP220-N
SDA200 • Loudspeaker
This contains a 3 W / 8 Ω loudspeaker and can be connected to
SDP220 receivers that are already powered. It is available in pale grey
(SDA200) and anthracite grey (SDA200-N).
SDA200-T • Loudspeaker and power supply for SDP220
In addition to the 3 W / 8 Ω loudspeaker, this module also contains a
transformer, SDT100, from the mains 230 Vac voltage for the SDP220
receiver module. Available in light grey colour (
SDA200-T
) or black
colour (
SDA200-TN
).
SDA200
SDA200-T
SDA200-N
SDA200-TN