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SZI 30 IR Radiator
FEATURES
Easy installation; precise alignment
Compact radiator for the carrier
frequencies 2.3 MHz and 2.8 MHz
ARCHITECT’S
SPECIFICATIONS
The miniature infrared radiator shall be
for use with companion modulators as
part of a wireless IR transmission system.
The radiator shall be capable of operating
on carrier frequencies ranging from
30 kHz – 6 MHz.
The maximum coverage area shall be
80 sq m (861.11 sq ft) in single-channel
operation, with a radiating power of 0.5 W.
The operating voltage shall be 24-27 V DC,
current consumption shall be 150 mA.
The radiator dimensions shall be
118 x 25 x 90 mm (46.46“ x 9.84“ x 35.43“).
Weight shall be 135 grams (4.76 oz).
The radiator shall be the Sennheiser SZI 30.
The SZI 30 is a miniature-sized radiator which can be fed modulated
signals from an SI 30 or any other modulator. With their 11 IR transmission
diodes, the SZI 30 can cover areas of up to 80 m². In two-channel (stereo)
operation, coverage is reduced to 40 m²
TECHNICAL DATA
Nominal deviation .................................................. +/- 50 kHz
Carrier frequencies ..................................................30 kHz – 6 MHz
Output impedance ..................................................20 kO o. 50 O
IR Diodes ...................................................................11
Max. coverage area.................................................80 m²
Radiating power ......................................................0,5 W
Operating voltage (mains) ...................................24 –27 V DC
Current consumption .............................................150 mA
Dimensions ...............................................................118 x 25 x 90 mm
Weight .......................................................................135 g
Delivery includes .....................................................SZI 30 radiator
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SI 30/SZI 30
25 mm0.98˝)
118 mm (4.65˝)
90 mm (3.54˝)
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121110987654321 Channels
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Infrared Wireless Systems | Modulators/Radiators
SI 30/SZI 30
SZI 30 Mini Radiator
The SZI 30 is a miniature-sized radiator which can be fed modulated signals from
an SI 30 or any other modulator. In narrow-band systems it can transmit frequencies
of up to 1.3 MHz (channel 31). It has no charging compartments, the LED on the
right of the front panel serves as a power indicator instead, showing that a supply
voltage is present.
At the back of the SZI 30 you have – besides the DC input connector – two RF
sockets. If no plug is connected to the output socket, a 50-O terminating impedance
is switched into the RF connection.
SI 30 / SZI 30 – Common Features
With their 11 IR transmission diodes, the SI 30 and SZI 30 can cover areas of up to
80 m
2
. In two-channel (stereo) operation, coverage is reduced to 40 m
noise ratio of 26 dB (the outer of the two characteristics in the polar diagram) gives
an intelligible but noisy signal. Only a signal-to-noise ratio of > 40 dB ensures com-
fortable listening without the annoying noise.
SI 30 modulators/radiators and SZI 30 radiators are especially suitable for the
following applications:
j
As small wideband systems, e.g. for transmitting TV sound. Such a system can
consist entirely of SI 30 and SZI 30.
j
As auxiliary radiators in combination with the SZI 1029, for covering room niches
and recesses.
j
As “island solutions” – e.g. for exhibits in a museum. Such a system can econom-
ically be implemented using the SI 30. The individual areas within the museum
have to be optically decoupled, giving the visitor exactly the audio information
which is associated with the exhibit he or she is facing – without having to switch
channels.
With the IZK 20 mounting clamp and the IZM 20 cluster mounting kit, up to four SI 30/
SZI 30 can be mounted on top of one another. This makes it very easy to align them
correctly, at an angle to one another. The diagram on the left shows an installation in
which the radiators have been mounted in 60° steps. The result is an almost uniform
coverage over an angle of 200°.
1 2 3
33m
30m
27m
24m
21m
18m
15m
12m
9m
6m
3m
36m
39m
42m
45m
20˚
10˚
30˚
40˚
50˚
60˚
70˚
80˚
90˚
20˚
10˚
30˚
40˚
50˚
60˚
70˚
80˚
90˚
26dB
40dB
Infrared Wireless Systems | Modulators/Radiators
SI 30/SZI 30
SI 30 Modulator/Radiator
The SI 30 is a miniature combination modulator/radiator. It is slim and compact but
can cover areas of up to 80 m
2
(262.67 sq ft) in mono operation. The integrated
modulator uses stereo wideband modulation. When the audio signal at the SI 30
input exceeds a certain threshold value, the modulator/radiator is switched on auto-
matically. It switches off again when there has not been an audio signal for about 2
minutes. Transmission is indicated by a green LED on the left of the front panel.
The radiator of the SI 30 comprises 11 IR transmission diodes connected in series.
The AF input of the SI 30 is a 3-pin Texas socket located at the back of the unit, on
the left. It is an unbalanced stereo input, so you should not use long connection
cables. A 2 m (6.56 ft) connection cable with 3.5 mm (1/8˝) stereo jack to a 3-pole
Texas connector is supplied as standard.
An automatic modulation control adapts to audio signals between 45 mV and 4 V.
This process is effected over a period of about one minute, so that short speaking
pauses do not entail a greater amplification. Problems may arise when you are work-
ing with microphones and very different signal levels. Longer breaks can lead to a
strong increase in amplification.
When connecting the SI 30 to headphone sockets of TV sets or similar sound sources,
you should adjust the level to a medium value. Too low a level results in more noise.
With the channel selector switch, you can choose between channel 1 or 2 trans-
mission or stereo operation. In mono operation, the integrated radiator and all
connected radiators can cover a greater area. For mono transmission, choose the
frequency suitable for the receiver, e.g. 2.3 MHz (channel 1) for the RI 150.
The RF output for connection of additional radiators is designed as a 3.5 mm (1/8˝)
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Infrared Wireless Systems | Modulators/Radiators
Contact your local Service Partner:
SZI 30 IR Radiator
DIMENSIONS POLAR PATTERN
PRODUCT VARIANTS
SZI 30 Art. No. 04633
(Universial IR radiator)
RECOMMENDED ACCESSORIES
Plug-in mains unit
NT 20-1 (EU version) Art. No. 03600
NT 20-1-120 (120 V version) Art. No. 03601
NT 20-1-UK (UK version) Art. No. 03602
Plug-in mains unit for up to four SI/SZI 20 or 30
NT 20-4 Art. No. 03603
NT 20-4-120 120 V version Art. No. 03604
Sennheiser electronic GmbH & Co. KG
Am Labor 1, 30900 Wedemark, Germany
www.sennheiser.com
RF connection cable
KR 20-7 (7m) Art. No. 03535
KR 20-015 (0.15 m) Art. No. 03536
Extension lead
KK 20-1 Art. No. 03557
KK 20-7 Art. No: 03558
IZK 20 Mounting clamp for SI/SZI 30 Art. No. 03560
IZM 20 Cluster mounting kit Art. No. 03561
10/12 Sennheiser is a registered trademark of Sennheiser electronic GmbH & Co. KG. www.sennheiser.com. Copyright © 10/2012. All rights reserved. Errors and omissions excepted.