Sennheiser SZI 1029 - Manual (Page 3)

SZI 1029
SZI 1029
The SZI 1029 is a high-power radiator for wideband or narrow-band signals from
any modulator. Its mains unit automatically adapts to mains voltages of 85 – 265 V
and mains frequencies between 50 and 60 Hz, the individual product variants only
differing in the type of mains cable supplied. The only exception is the SZI 1029-24
which operates on 24 V DC. For 24-V equipment, mains voltage regulations are no
longer applicable, thus making installations by audio-visual companies much easier.
All controls and connectors of the SZI 1029 are on the base. A 5/8“ thread with an
adaptor for conversion to 3/8“ and 1/2“ threads makes for versatile mounting. If
the radiator is to be stand-mounted, its cables are guided unobtrusively down the
stand. For ceiling mounting, the SZI 1029 is simply turned upside down (the bottom
faces the ceiling) and the cables are guided along the ceiling.
The 132 IR diodes of the SZI 1029 are arranged in independent groups of eleven.
The operational status of the diodes and the radiator is indicated by a green and a
red LED at the front. If only the red LED is lit, the radiator is in stand-by mode and
a mains voltage is present, but there is no RF carrier. If only the green LED is lit, the
radiator is operating and transmitting an IR signal. The radiator switches on auto-
matically as soon as it receives an RF signal of at least 50 mV. When the RF signal is
no longer present, the radiator switches back to stand-by. If both the red and the
green LED are lit, the radiator indicates a malfunction: more than four diode groups
fail to operate. The radiator will continue to operate at a reduced radiating power
but it should be repaired as soon as possible.
The sockets and controls are on the base of the SZI 1029 (see diagram on the left).
On each side, the radiator is fi tted with a heat sink. When installing the radiator,
care should be taken that these sinks are not covered and that the radiator is not
mounted horizontally. The optimum position is vertical or almost vertical so that
air can circulate freely through the cooling fi ns and heat is dissipated quickly.
The modulator signal is fed to the BNC RF input. An automatic modulation control
compensates for cable losses and ensures an optimum modulation level for the IR
diodes. At the RF output socket (BNC) the signal can be daisy-chained to additional
radiators.
The mono/multi switch increases the radiating power by 3 dB when set to “mono”.
Thus, the coverage area is approx. 50 % larger, but at the same time, the THD
becomes greater, which would lead to interference with higher channels in multi-
channel operation. For this reason, you should only switch to “mono” for single-
channel applications and use the “multi” position for multi-channel operation. The
SZI 1029 radiator has a 5/8“ thread and is supplied with an adaptor for conversion
to 3/8“ or 1/2“ threads. You will fi nd suitable attachments such as mounting plates
or table stands in the chapter “Accessories”. The radiator’s IEC mains connector can
be secured by a steel clamp. The SZI 1029-24 variant is equipped with an XLR-4
connector as power supply socket.
SZI 1029 radiator
LED indicators of the SZI 1029
Green LED:
operation
indicator
Red LED:
stand-by
Red and
green LEDs:
malfunction
indicator
Bottom view of the SZI 1029 with sockets and controls
MONO MULTI
CHANNEL
OUTPUT INPUT
1 Heat sinks
2 RF input, BNC socket
3 Mono/multi switch
4 RF output, BNC socket
5 Thread for mounting the radiator
6 IEC mains connector
7 Steel clamp for securing the mains connector
1 2 3 4 5 6 7 1
IR Audio Transmission Technology | Modulators/Radiators