User manual SENNHEISER SZI 1029-10

[. . . ] Red LED, mains supply indicator and warning light for reduced IR radiating power (malfunction indicator) In a cordless infra-red sound transmission system it transforms the electrical signal delivered by an infra-red modulator or by an audio source into invisible infra-red light and radiates this IR light into a room. In contrast to radio transmission infra-red transmission is limited to the room, thus other systems can be operated in neighbouring rooms without interference. the high-power radiator SZI 1029 is switched on by the IR carrier signal that is produced by the modulator. Commercially available 50 coaxial cables with BNC connectors are used for feeding sig nals from the modulator to the SZI 1029 radiator. [. . . ] When switched to narrow-band multi-channel operation (switch set to MULTI) power output and thus irradiated area are reduced by approximately 35 % (see RADIATING POWER DURING MULTICHANNEL A simple formula facilitates the calculation of the number of radiators necessary to irradiate a given room: RULE OF THUMB X Anzahl of channels surface area in m2 x number der Kanäle 650 The high power radiator SZI 1029 radiates the infra-red light in a lobar shape. With increasing distance the intensity becomes weaker. When a receiver leaves the irradiated area the transmission is interrupted. Recei vers without squelch will produce a hissing noise, receivers with squelch will mute. (Not for SZI 1029-T models) The number of transmitted channels has an impact on the radiated power of the infra-red radiator SZI 1029. The power is uniformly divided in such a way that, for instance, in a system with 12 narrow-band channels only 1/12 of the desired radiating power is available for each audio channel. Several co-axial cables are available for this purpose (see ELECTRICAL ACCESSORIES). The cables can be connected to one another using a BNC coupler GZV 1019 A. Install the SZI 1029 high power radiator in a vertical (or almost vertical) position. The vertical position ensures sufficient cooling of the radiator - air can circulate through the cooling fins that are integrated into the sides of the radiator. For permanently installed systems you should use commercially available 50 coaxial cables, such as RG 58 (75 cables can be used if 50 cables are unavailable). If you want to use several SZI 1029 radiators you have to connect them in series. This is done by connecting the output BNC socket of the first radiator with the IR input BNC socket of the second radiator. After having connected the last radiator you can put the transmission system into operation by switching on the modulator. it transmits a carrier signal which automatically switches on the radiators. When the carrier signal stops, the radiators switch off automatically. : In order to avoid standing waves a terminating impedance of 50 should be connected to the last radiator (or 75 terminating impedance if 75 cable was used). SINGLE-CHANNEL/MULTICHANNEL OPERATION Selector switch singlechannel (Mono)/multichannel (Multi) The SZI 1029 high power radiator is provided with an interchangeable thread for mounting it to stands with 3/8" or 1/2 , , threads using an adaptor (included in the scope of delivery). The length of the cable between two neighbouring radiators should not exceed 75 m, otherwise signal cancellation can occur when the radiation is not in phase!If one power block fails, transmission quality is not considerably affected. [. . . ] interchangeable thread 1/4 , , - 3/8 , , . Table stand In combination with GZG 1029 for simply placing the radiator on shelves and cupboards. SZI 1029 (SZI 1029-10) Number of radiator diodes Approximate radiating power Wavelength of radiated infra-red light approx. If you consider using a transmission system with high power IR radiators SZI 1029 the , , Infra-red Planning Brochure" from Sennheiser is available. [. . . ]