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Quickly convert PDF files to editable Microsoft Word DOCX documents. ifications mention only dB rather than dBi or dBd; in this situation, it is usually understood to be dBd, but using an antenna in which the gain is explicitly specified as dBi or dBd can help you avoid surprises later Gain specified in dBi is always a higher number than gain specified in dBd An isotropic antenna cannot be created in the real world, but it is useful for calculating theoretical fade and system operating margins A dipole antenna has 215 dB gain over a 0 dBi isotropic antenna; therefore 0 dBd is equal to 215 dBi So if an antenna gain is provided in dBd, not in dBi, you can add 215 to it to get the dBi rating For example, if an antenna has 6 dBd gain, it would have 6 + 215 = 815 dBi gain Antenna manufacturers specify gain in dBd because they calibrate their equipment using a simple dipole antenna as the standard Then they replace it with the antenna they are testing The difference in gain (in dB) is in reference to the signal from the dipole antenna, providing gain in dBd Two other terms used in radiocommunications are effective radiated power (ERP) and effective isotropic radiated power (EIRP) These terms are used to describe power output from an antenna ERP is the product of the power supplied to the antenna and its gain relative to a half-wave dipole antenna in a given direction, usually in the direction of maximum gain (main lobe) EIRP is the product of the power supplied to the antenna and its gain relative to an isotropic antenna in a given direction, usually in the direction of maximum gain (main lobe) The ERP and EIRP are simply the transmitter power times the antenna gain and can be expressed in units of watts, milliwatts, dBw, or dBm Remember that in dB units, multiplication becomes addition due to the logarithmic nature of dB Let s consider two examples of EIRP calculation, one using watts and another using dB An interrogator connected to an antenna with 6 dBi gain is emitting 1 W of power at the antenna terminal (we will ignore cable losses) What is the EIRP from the antenna. convert pdf to editable word online free: Download PDF to Word Converter Pro 8.1.1.7 pdf to word converter online PDF to Docx Converter - Smallpdf.com
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Convert PDF to Word 100% free online . No email required, no limits, no watermarks. Using Watts 6 dBi antenna gain means the antenna amplifies the signal by a factor of 4 So EIRP = interrogator power output antenna gain = 1 4 = 4 watts Using dB Converting 1 W from interrogator into dB units gives 30 dBm Now calculate EIRP = interrogator power output + antenna gain = 30 dBm + 6 dBi = 36 dBm pdf to word converter online Convert PDF to Word - Free PDF to Word Converter Online
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