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- Page 1 INFRARED RADIATOR LC3.IRR25 Operation manual Linear Technologie • 11 rue du Puits Rochefort • 42 100 Saint-Etienne V.2017 Tél: +33 (0)4 77 81 49 49 • Fax: +33 (0)4 77 81 49 40 • www.lineartech.fr...
- Page 2 TABLE OF CONTENTS Page 3 1. Safety operation Page 4 2. System introduction Page 9 3. Digital infrared radiator...
- Page 3 1. SAFETY OPERATION Firstly, thank you very much for using LINEARCOM3000 conference system. To make sure safety of equipment and user, please read this safety instruction carefully before installing and using and operate seriously according to this manual. Also please keep this safety instruction for future reference.
- Page 4 2. SYSTEM INTRODUCTION Brief introduction LINEARCOM3000 is a series product of digital infrared language distribution system. It uses both digital infrared audio transmitting and control technique and an IR digital infrared chip. They own LINEARCOM3000’s intellectual property. IRRC08 can be used in simultaneous interpretation systems for multi-language conferences.
- Page 5 System composition The system consists of a number (N) of audio sources, either analogue or digital, which are connected to a transmitter. The transmitter processes the audio signals into an electrical output to feed the infrared radiator. The infrared signal is received by the infrared receiver that processes the signal and outputs an audio signal and/or associated data.
- Page 6 Carriers System is transmitting within the 2 ~ 8 MHz frequency band. It can transmit up to 8 different carrier signals (depending on the transmitter type) Carriers 0 to 5 are according to IEC 61603-7. Aspects of infrared distribution A good digital infrared language distribution system ensures that all delegates in a conference venue receive the distributed signals without disturbance.
- Page 7 The direction and sensitivity of receiver unit The sensitivity of a receiver is at its best when it is aimed directly towards a radiator. To minimize the disadvantage of this aspect, IRRC08 receiver adopts an ingenious structural design with peculiar 270° ultra wide angle to get perfect IR capture and sound quality at any disposition.
- Page 8 If the path of the infrared signals is blocked, e.g. under balconies, at least one additional radiator is needed to cover the ‘shaded’ area. Overlapped footprints and multi-path effect If footprints of two radiators overlap, the total coverage area maybe larger than the sum of the two separate footprints.
- Page 9 Increased coverage area caused by added Reduced coverage area caused radiation power differences in cable signal delay The lower the carrier frequency, the less susceptible the receiver is for differences in signal delays. The signal delays can be compensated by adjusting the delay compensation switches on the radiators.
- Page 10 • HF input / output socket (2 x BNC), is used to connect infrared controller / and series connect next infrared radiator. • Dimension : 500 x 214 x 178 mm. • Color : Sliver, golden, black. • Weight : 5.2 kg. Technical parameter of infrared radiator Modulation mode Digital wireless base station...
- Page 11 Installation of infrared radiator For position planning, please read section to understand and consider every aspect of infrared distribution system. The rectangular footprint To determine the optimal number of infra-red radiators needed to have complete coverage of a conference venue can only be done by performing a site test. However, estimation can be done by «guaranteed rectangular footprints».
- Page 12 Planning radiators Plan the radiators by following procedure. 1. Decide the positioning of the radiators by the recommendations in section 2.3. 2. Decide the applicable rectangular footprints by consulting the table or calculating with the footprint calculation tool. 3. Draw a picture of the rectangular footprints in the layout of the room. 4.
- Page 13 Mounting The radiator can be permanently installed on the wall, under a ceiling or balcony by bracket. The mounting angle can be adjusted for optimal coverage through angle adjust handle. A separate bracket is optional for wall mounting and a floor stand can be used for nonpermanent installation.
- Page 14 Wall mounting A separate bracket is optional for wall mounting. The bracket can be fixed on to the wall by 4 screws. Ceiling mounting The radiator can be fixed to the ceiling by using the built-in bracket. Please make sure to have enough space for a proper air flow around the radiator when select ceiling mounting.
- Page 15 Mounting on horizontal surface If the radiator has to be installed on a horizontal plane (e.g. on the top of an interpreter booth), the distance between the radiator and the plane should be at least 4 cm to ensure enough airflow around the radiator. If not, switch the radiator to half power. If the radiator is working at full power on top of an interpreter booth, the ambient temperature should not exceed 35°C.
- Page 16 Connecting of radiators There are six HF signal output interfaces on the main unit. Each one can connect up to 30 radiators by “hand by hand”. The radiators are connected with RG-59 cables. The maximum cable length per output is 900m. Output power selection The radiator can be switched to half power output.
- Page 17 In most cases the cable signal delays can be calculated manually using in addition the delay switch calculation tool. How to calculate the delay switch positions manually for systems with one, two or more transmitters will be described in the next sections. Refer to the delay switch calculation tool for information how to do to get a computed value for the delay switch position.
- Page 18 Cable length Cable signal Signal delay Radiator Total cable Delay switch difference delay d i f f e r e n c e number length L (m) position LMAX*-L(m) meter (ns/m) (ns) 30+20+20=70* 70*-70 = 0 0*5.6 = 0 0/25 = 0 30+20=50 70*-50 = 20 20*5.6 = 112 112/25 = 4.48 ≈4...
- Page 19 Linear Technologie • 11 rue du Puits Rochefort • 42 100 Saint-Etienne Tél: +33 (0)4 77 81 49 49 • Fax: +33 (0)4 77 81 49 40 • www.lineartech.fr...
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