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-Ω 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
2
. A signal-to-
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:
As small wideband systems, e.g. for transmitting TV sound. Such a system can
consist entirely of SI 30 and SZI 30.
As auxiliary radiators in combination with the SZI 1029, for covering room niches
and recesses.
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°.
SZI 30 back panel
1 RF socket J2 (3.5 mm mono jack)
2 RF socket J1 (3.5 mm mono jack)
3 Power supply socket (2-pin Texas)
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
Polar pattern of the SI 30 / SZI 30
free field, extraneous light < 100 lx, single-channel operation
Four SZI 30, mounted at an angle of 60° to one
another. For comparison purposes, the coverage of
a single SZI 30 is shown at 30°.
33m
30m
27m
24m
21m
18m
15m
12m
9m
6m
3m
36m
39m
42m
45m
20˚
26dB
40dB
1
0
˚
20˚
3
0
˚
4
0
˚
5
0
˚
5
0
˚
40˚
3
0
˚
20˚
1
0
˚
60° 60°
60°
Radiator cluster with four IZK 20 clamps and IZM 20 cluster mounting kit
IR Audio Transmission Technology | Modulators/Radiators
(26 pages)
(96 pages)
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