Passive Infrared
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 SOUTHWEST MICROWAVE 415 PASSIVE INFRARED SENSOR  US $3,924.00
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 TAKEX PA7100E 360 degree Passive Infrared Indoor Ceil US $173.00
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 Net Safety Passive Infrared PIR Sensor US $159.00
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 LINEAR DXT 54 Passive infrared motion sensor with buil US $73.00
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 DSC BV 500GB Ceiling mount passive infrared US $72.00
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 2 GIG Technologies 2GIG PIR1 Passive Infrared Motion Detect US $69.00
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 UNICORN PASSIVE INFRARED DETECTOR SP 15S US $44.99
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 DS151 1 Request to Exit Passive infrared with Wrap around Coverage US $39.99
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 ADEMCO Topaz 5775 Wireless Passive Infrared Detector US $39.95
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 PASSIVE INFRARED MOTION SENSOR MPC 3838 BURGLAR ALARM US $4.99
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 Bosch DS150i 151i Request to Exit Passive Infrared With Wrap Around Coverage US $.99
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Tips For Picking The Optimal Wireless Audio Transmitter Product For Whole-Home Audio Streaming
Recently more and more wireless audio transmitter devices have appeared which promise to deliver the ultimate freedom of broadcasting music throughout the house. We will have a look at numerous products and technologies to find out in how far these products are useful for whole-house audio applications and what to look out for when purchasing a wireless system.
Running audio in your home can be a daunting chore. Many houses are not wired for multi-room audio and getting the music from your living room to your bed room can be quite a problem. There are several technologies solving this problem. These include infrared wireless, RF wireless, wireless LAN (WLAN) and powerline.
Infrared is restricted to line of sight since the audio signal is sent as lightwaves and for that reason devices utilizing this technology, such as infrared wireless surround sound products, are limited to a single room.
RF wireless products will send the signal as RF waves. These waves can without problems go through walls. RF wireless audio devices either make use of FM transmission or digital audio transmission. FM transmitters are the least expensive alternative. They provide decent range but the audio signal is prone to audio distortion and noise and is extremely susceptible to interference from other wireless transmitters.
Digital wireless audio transmitter products, such as products from Amphony, make use of a digital protocol. The audio is first converted to digital data before being transmitted. Some wireless audio transmitters will use audio compression, such as Bluetooth transmitters which will decrease the audio quality to some degree. Digital wireless audio transmitters which broadcast the audio uncompressed offer the highest audio fidelity.
Wireless LAN (WLAN) products are useful when streaming from a PC but will add some amount of latency or delay to the signal because wireless LAN was not originally designed for real-time audio streaming. Also, a number of products require to purchase separate wireless LAN modules that are plugged into every audio receiver.
Powerline products broadcast the audio via the power mains and provide large range. They run into problems in homes where there are separate mains circuits in terms of being able to cross over into another circuit. Powerline products have another challenge in the form of power surges and spikes which can cause transmission errors. To avoid audio dropouts, these products will generally have an audio latency of several seconds as a safeguard.
Here are some tips for picking the optimum wireless audio system: Try to find a system that can run several wireless receivers from a single transmitter. Ideally an unlimited number of receivers should be supported. That way you don't need to purchase additional transmitters when you start adding receivers in several rooms of your home. Choosing a product with some form of error correction will help mitigate against strong RF interference. Such interference can be caused by other wireless transmitters. Pick a digital RF transmitter to preserve the original audio quality, ideally one with an audio latency of less than 10 ms in case of video or other time-sensitive applications.
Pick a transmitter that has all the audio inputs you require, such as speaker inputs, line-level RCA inputs etc. Get a wireless system where you can purchase separate receivers later on. You should verify that you can get receivers for all the different applications you have. Such receivers may include amplified receivers for passive speakers or line-level receivers for active speakers. If you go with a digital audio transmitter, choose one with an input audio level control knob to avoid the music signal from clipping inside the transmitter audio converter. This will guarantee optimum dynamic range regardless of the signal level of your equipment.
Check that the system offers amplified receivers with a digital amplifier to guarantee high power efficiency. This will help keep the receiver cool during operation. Also, make sure the amplifier provides low audio distortion. This is vital for good sound quality. Check that the amplified receiver can drive speakers with the desired Ohm rating and that it is small and easily mountable for easy set up. Devices which function in the 5.8 GHz frequency band will have less problems with wireless interference than products using the crowded 900 MHz or 2.4 GHz frequency band.
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