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8
SI 29-5
Instructions for use


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9
Putting the IR modulator into
operation/power supply
The SI 29-5 infra-red modulator is powered via the NT 29 plug-in mains unit
.
It is connected to the DC input socket
by a special twist-lock connector.
The NT 29-5 mains unit is available in different versions, so that the SI 29-5
modulator can be used with the respective voltage of your country:
· NT-29-EU
230 V 50/60 Hz
Cat. no. 04002
· NT 29-120
120 V 50/60 Hz
Cat. no. 04003
· NT 29-UK
240 V 50/60 Hz
Cat. no. 04004
AF inputs
Five XLR input sockets
for connection of five mono audio signal sources are
located at the back of the SI 29-5 infra-red modulator.
The inputs are balanced and floating.
In addition, all inputs are available at the 25-pin D-connector
. For the
connection details of this connector please see the service manual.


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10
Connecting IR radiators
Connect the infra-red radiators to sockets
. The SI 29-5 will modulate the
infra-red light which will then be radiated by the IR radiators.
You can connect a maximum of 50 radiators to the SI 29-5 modulator. You
can also use different radiators (mixed operation):
· SZI 20
Low power infra-red radiator for small rooms, cascadable
· SZI 1029
High power infra-red radiator, IR radiating power 5 W,
socket for connection of additional SZI 1029, SZI 1029-10
or SZI 20. Black or unpainted aluminium housing.
· SZI 1029-10
High power infra-red radiator, IR radiating power 10 W,
socket for connection of additional SZI 1029, SZI 1029-10
or SZI 20. Black housing.
N.B. Please also read the instructions for the IR radiators!
Avoid very long cable lengths because they lead to signal cancellation when
IR radiators are facing one another:
Wr
ong
!
RIsk of
cancellation !
correct
!


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11
To make a larger system, you can combine several infra-red modulators. In
the largest possible system, a maximum of 32 transmission channels can be
used:
Number of modulators
Maximum number of transmisson channels
15
210
315
420
525
630
732
N.B.:
Do not duplicate channel numbers!
Cascade the infra-red modulators with a BNC connection cable. Use the
cascading sockets (
)
for interconnecting. Since these sockets are internally
connected in parallel, it does not matter whether you choose the left or the right
socket
.
Connecting several SI 29-5 modulators


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12
Choosing the audio input
By simultaneously pressing the buttons "INPUT" and "+" or "-", you start
the input search for sockets 1 - 5 at the back of the modulator.
With the "+" button you choose a higher input number.
Holding this button down initiates fast search, continually
cycling from the beginning.
With the "-" button you choose a lower input number.
Holding this button down initiates fast search, continually
cycling from the beginning.
When both buttons are released the selected input is stored. Now you have
to choose the infra-red transmission channel for the selected input.
Choosing the
IR transmission channel
Switching a channel off
By simultaneously pressing the buttons "CHANNEL" and "+" or "-" you start
the search for the infra-red transmission channel which is to be assigned to
the input.
To switch a channel off, search through the transmission channels as described
above. The OFF position is the next channel above "
£ ¡" or below "ºº"
(depending which way you go). The display will indicate "
ºF." instead of a
channel number and the corresponding LED
will go off.
NB: It is important that any unused channels are switched off. Any
channel left on, but unused, will reduce the radiator coverage area accor-
dingly. (See the section on calculating the radiator coverage area in the user
manual supplied with the radiator).