Beyerdynamic SIR 800, Operating Instructions Manual, Page: 10 / 24

SIR Infrared System SIR 800
8
3.3 Compact SIR 800 transmitter
Front View
The compact SIR 800 transmitter is part of the SIR system, which serves the wireless language
distribution by means of infrared light.
The sound signal is thereby converted into a frequency-modulated infrared signal and emitted via
transmitting diodes. With special SIR receivers the signal is re-converted into a sound signal, which can
be heard on a set of headphones. Up to 8 channels can be transmitted simultaneously with an FM
narrow band modulation.
The compact SIR 800 transmitter is provided for modulating the sound signals on the different carrier
frequencies and for signal amplification.
The compact transmitter consists of a 19" housing (2HU). Mounting brackets for rack assembly are also
available.
Seven languages and the original (floor channel) can be transmitted.
On the front right-hand side of the compact SIR 800 transmitter there is a green POWER ON showing
the ON/OFF status. Next to this there are three infrared test diodes emitting the IR-signal. With the IR
receiver you can listen to the outgoing channels even without IR-Radiator.
The operating elements of the eight infrared channels are also on the front side of the console.
With miniature-switches on the front panel the frequency band can be chosen and the channels can be
switched ON or OFF. With a rotating switch it is possible to assign up to 32 transmission channels. Each
channel can be set from OR - Ch31.
Eight green LED (“INT”) indicate the status of the corresponding interpreter channel: green LED means
interpreter is “live”. This gives a quick overview about the occupied channels.