The assembling businesses requires expanding requests of individuals along these lines assuming a noteworthy job in regular day to day existence and on the contrary hand, there is a requirement for speedy and safe delivering technique also. In the pr
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En este nuevo manual te mostraré la forma más facil de hackear cualquier red inhalambrica, de una forma tan sencilla que no te lo vas a creer.
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Descrição: SEGURANÇA DE REDES WIRELESS
SEGURANÇA DE REDES WIRELESS
informe red industrial mediante wirelessDescripción completa
wireless
En este nuevo manual te mostraré la forma más facil de hackear cualquier red inhalambrica, de una forma tan sencilla que no te lo vas a creer.
Design and development of wireless sensor network / Home Automation system using ZigbeeFull description
wireless gesture control robot
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11/18/2015
Wireless Calculators
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Home / Wireless Calculators
Wireless Calculators A Wireless System (more or less!)
Key: Green is good, Red is bad. 1. 2. 3. 4. 5.
Power Budget total power of your system in dBm. Free Space Loss power loss over distance. System Performance How far will it go, will it get there or what is my Operating Margin? Fresnel Zones How much more than LOS or how high should my antenna be? Power Conversion dBm to milliWatts and milliWatts to dBm
Power Budget Use this calculator to walk through all the factors that make up your Power Budget. The 'Power Budget' is the the total power being output from the wireless system and is the sum of: PLUS Radio Transmit Power (A above) MINUS cables and connectors losses (B above) PLUS antenna gain (C above). Enter one parameter in each column (or leave blank) depending on what you know and the calculator will supply the appropriate conversions automatically. Up to 2 decimal places may be entered as 0.xx or .xx. Note: Connector loss is generally small UNLESS you've got lots of 'em in which case you are probably in trouble anyway, or your cable is VERY short. Just leave the line blank if you are feeling lazy. Calculations and equations used. Radio and Antenna Transmit Power Antenna Gain mW dB(i) OR dBm Cable Loss Cable Properties (per 100 ft or m) dB (100 ft) OR dB (100 m) Connector Loss Frequency in MHz MHz. 2400 Budget
Cable Length
Power dB
feet
dB
OR meters No. of Connectors No. Calculate
dB dB
Free Space Loss Loss of power over distance (assuming no FRESNEL Effect and nothing in the way). This a very idealised calculation and in practice everything interferes with the signal but it will give you a reasonable approximation of the actual loss over distance. Enter the system Frequency in MHz and the distance in either Kilometers (Km) or Miles below and then click the 'Calculate' button. 1 GHz = 1000 MHz e.g. 2400 = 2.4 GHz. Calculations and equations used. Frequency Distance MHz Km 2400 OR Miles
Result Calculate
dB
Fresnel Zones Defines how much clearance you need (yes you need more than simple LineofSight) and for longer links > 3 Km (2 miles) whether you may have a ground clearance problem from our friendly planet. M. Fresnel and http://www.balticnetworks.com/wirelesscalculators#budget
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11/18/2015
Wireless Calculators
his theories. Enter the Total link distance (in Miles or Kilometers), if you do not enter an Obstacle distance (in Miles or Kilometers) the calculator will use the midpoint for all calculations (Note: assumes antennas at same height). Finally enter the system Frequency in MHz and then click the 'Calculate' button. 1 GHz = 1000 MHz e.g. 2400 = 2.4 GHz. The calculator will generate the radius of the 1st Fresnel zone only (at the obstable point or the midpoint), the 60% (no obstacle) radius and the height of the effective earth curvature at the midpoint of the Total link distance using the effective earth radius. Calculations and equations used. Total Link Obstacle 1st Fresnel Zone Radius Distance Km Km m OR
OR
at
ft
at Km
Miles Miles Frequency MHz 2400 Calculate
Miles
60% No Obstacle Radius m Earth Height (midpoint)
ft
m
ft
System Performance This calculator will give you one of three answers: 1. If you leave distance blank it will apply the defined SAD factor (or default to 30%) to the Operating Margin and supply the max. distance (in Km and Miles) at which the Margin operates. 2. If you enter the distance it will calculate the Operating Margin and the SAD factor. 3. If you enter distance but leave RX or TX antenna gain (or both) blank it will apply the chosen SAD factor (or default it to 30% if none supplied) and generate the required antenna power. If both are left blank it will calculate a symmetrical antenna gain. To RESET any parameter just set it to BLANK before clicking 'Calculate' Notes: RX Sensitivity is ALWAYS expressed as a negative dBm ( dBm) and is the lowest power of signal your radio can handle. Its buried somewhere in your radio spec and will be typically in the range of 70 to 110 dBm. Don't guess or 'fudge' this number. Note: If you solve for TX antenna (you leave it blank) and define a specific SAD factor it is applied to the TX budget and any TX antenna value will include this factor. If you then click Calculate again without changing anything, the SAD factor will be calculated to include the supplied TX antenna value and thus may show a lower value than the original one. Calculations and equations used. Frequency Distance Km 2400 MHz
FS Loss
TX Antenna dB
Total TX
RX Antenna dB SAD Factor %
Total RX
dB
OR Miles
TX Power
TX Cable dBm
dBm
dB
OR mW RX Sensitivity dBm 89 Margin Calculate
RX Cable dB RX Power dBm
dB Theoretical dB
milliWatts to dBm (and vice versa) Power in milliWatts to dBm (and vice versa) . Enter the 'Transmit Power' (A or G above) in milliWatts OR the 'Power Ratio' in dBm and click the appropriate 'Calculate' button. 1 Watt = 1000 milliWatts. Calculations and equations used. Transmit Power mW Calculate
Result
Power Ratio
Result
dBm
dBm
Calculate
mW
Power Budget Calculations
1. mW to dBm = 10Log10(mW) 2. feet to meters = .3048 3. meters to feet = 3.28
4. Calculator normalises all distances to kilometers and meters 5. Connectors loss = 0.10 * square root (frequency in GHz)
1. Free space loss = 36.56 + 20Log10(Frequency) + 20Log10(Distance in miles) 2. Calculator normalises all distances to miles 3. Miles to Kilometers = 1.609 4. Kilometers to miles = 0.621
Fresnel Zone Calculations
1. Calculator normalises all distances to kilometers and meters 2. Miles to Kilometers = 1.609 3. Kilometers to miles = 0.621 4. feet to meters = .3048 5. meters to feet = 3.28 6. 1st Fresnel Zone radius (Km) = 17.3 x Sqr root ((Obstacle Distance x (Total Link Obstacle Distance)) / (Frequency in GHz x Total Link)) 7. 1st Fresnel Zone radius (miles) = 72.6 x Sqr root ((Obstacle Distance x (Total Link Obstacle Distance)) / (Frequency in GHz x Total Link)) 8. Obstacle free radius = 0.6 x 1st Fresnel Zone radius 9. Radius of nth Fresnel zone (meter) = sqr root ( (n x wave length x Obstacle distance x (Total Link Obstacle Distance)) / Total Link ) 10. wave length (meters) = speed of light (299,792,458 m/s) / frequency in Hz 11. Earth curvature calculation = (Total Link) 2 /(8 * effective earth radius) 12. effective earth radius = 4/3 * Earth radius 13. Earth radius = 3963 miles, 6378 Km
System Performance Calculations
1. Calculator normalises all distances to miles and feet during calculations. 2. Free space loss = 36.56 + 20Log10(Frequency) + 20Log10(Dist in miles) 3. mW to dBm = 10Log10(mW) 4. dBm to mW = 10(dBm/10) 5. RX Power = Margin RX sensitivity 6. Theoretical margin = TX power budget + RX power budget free space loss 7. SAD factor = Theoretical margin/TX power budget * 100 and shows the percentage of spare power on transmission.
dBm to milliWatts Calculations
1. mW to dBm = 10Log10(mW) 2. dBm to mW = 10(dBm/10)