Resistor R3 1 10k 1/8W Resistor 10K 1/4W Resistor R4 1 100k 1/8W Resistor 100K 1/4W Resistor Q1‚ Q2 2 2N2222A NPN Transistor 2N3904‚ NTE123A L1‚ L2 2 5 Turn Air Core Coil MIC 1 Electret Microphone MISC 1 9V Battery Snap‚ PC Board‚ Wire For Antenna • L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on
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technology to add to the watch. The RFID (Radio Frequency Identification) technology is the piece of small antenna as if the small paper which is stick with the product. The sensor duty is detect the product that stick with the small antenna and send the data to the computer to record. Actually the technology can apply. The old duty of RFID is usually use in logistic or warehouse but we move the small antenna to the watch. Sensor which is detect the RFID in the cashier or vending machine like the credit card
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carrier is to be modulated to 90% level. Determine the total transmitted power. 4. An AM broadcast station operates at its maximum allowed total output power of 50 kW and at 95% modulation. How much of its transmitted power (sidebands)? 5. The antenna current of an AM transmitter is 12 A when unmodulated but increases to 13 A when modulated. Calculate the percent modulation. 6. An intelligence signal is amplified by a 70% efficient amplifier before being combined with a 10 kW carrier to generate
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International Journal of Scientific & Engineering Research Volume 4‚ Issue 2‚ February-2013 ISSN 2229-5518 1 RFID-Based Students Attendance Management System Arulogun O. T.‚ Olatunbosun‚ A.‚ Fakolujo O. A.‚ and Olaniyi‚ O. M. Abstract In recent years‚ there have been rise in the number of applications based on Radio Frequency Identification (RFID) systems and have been successfully applied to different areas as diverse as transportation‚ health-care‚ agriculture‚ and hospitality industry
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the receiver to pick up radio signals and later added wire antennas to improve it. A coherer is a glass tube with loosely packed metal particles inside of it used to pick up radio signals. These were the basics of the radio he first used to send radio signals across a long distance.(Saari) Marconi’s addition of the wire antennas was very significant and proved to be a necessity for the development of the radio. When waves reach an antenna‚ electric charges move up and down it. The radio detects the
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The effect of mobile phone radiation on human health is the subject of recent interest and study‚ as a result of the enormous increase in mobile phone usage throughout the world (as of June 2009‚ there were more than 4.3 billion users worldwide). Mobile phones use electromagnetic in the microwave range. Other digital wireless systems‚ such as data communication networks‚ produce similar radiation. The WHO has classified mobile phone radiation on the IARC scale into Group 2B - possibly carcinogenic
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ABSTRACT: Transmission or distribution of 5o Hz or 60 Hz electrical energy from the generating point to the consumers’ end without any physical wire has yet to as a familiar and viable technology. This paper focuses on the past and future possible advancements in WPT and explaining why it has still not come into practical utility. Wireless energy transfer has been around for about a century‚ but as of yet has only found usage in things like electric toothbrush rechargers and specialty applications
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Models: NanoStation M2/M5 NanoStation Loco M2/M5/M900 Introduction Introduction Thank you for purchasing a Nanostation M series product. This is a point-to-point CPE wireless device. This Quick Start Guide is for use with the following models: Model NanoStation M2 NanoStation M5 NanoStation Loco M2 NanoStation Loco M5 NanoStation Loco M900 Operating Frequency 2403-2475 MHz 5170-5875 MHz* 2402-2482 MHz 5170-5875 MHz* 904-926 MHz Ethernet Ports 2 2 1 1 1 * Only 5745-5850 MHz is supported in the
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UNITED STATES MARINE CORPS Field Medical Service School Camp Pendleton FMST 0218 Field Communication TERMINAL LEARNING OBJECTIVE 1. Given a tactical scenario in any combat environment‚ a SINCGARS field radio operator maintenance equipment‚ accessory bag‚ battery‚ frequency assignment‚ and a radio station within range‚ use a single channel ground and airborne radio system (SINCGARS) to transmit field communication‚ to support mission requirements. (FMST.02.18) ENABLING LEARNING OBJECTIVES
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CHAPTER 2 MULTIPLE ACCESS A limited amount of bandwidth is allocated for wireless services. A wireless system is required to accommodate as many users as possible by effectively sharing the limited bandwidth. Therefore‚ in the field of communications‚ the term multiple access could be defined as a means of allowing multiple users to simultaneously share the finite bandwidth with least possible degradation in the performance of the system. There are several techniques how multiple accessing can
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