Security Wireless
Il primo portale in Italia e nel mondo sulla (in)sicurezza del Wireless


Wireless Calculators

Calcolatrice Wireless

 

Sistema Wireless

Radio system

  1. Power Budget
  2. Free Space Loss
  3. System Performance
  4. Fresnel Zones
  5. Power Conversion

 

Power Budget

Calculations and equations used.

   
Transmit Power Antenna Gain Power
 mW
OR

 dBm
 dB(i)  dB
   
Cable Properties
(per 100 ft or m)
Cable Length  
 dB (100 ft)
OR
 dB (100 m)
 feet
OR

 meters
 dB
   
Frequency in MHz No. of Connectors  
 MHz.  No.  dB
   
   dB

 

Free Space Loss

Calculations and equations used.

  Result
 MHz  Km
OR
 Miles
 dB

 

Fresnel Zones

Calculations and equations used.

 Km
OR

 Miles
 Km
OR
 Miles
 m
at
 Km
 ft
at
 Miles
 
 MHz    m  ft
 
     m  ft

 

System Performance

Calculations and equations used.

  Result
 MHz  Km
OR  Miles
   dB
 
 dBm
OR
 mW
 dBm  dB  dB
 
 dBm  dB  dB  dB
RX Power SAD Factor Theoretical Margin
 dBm  %  dB

 

milliWatts to dBm (and vice versa)

Calculations and equations used.

  Result
mW  dBm
  Result
 dBm  mW

Power Budget Calculations

  1. mW to dBm = 10Log10(Watts) + 30

  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)

Free Space Calculations

  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) = 72.1 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 = sqr root ( (n x wave length x Obstacle distance x (Total Link - Obstacle Distance)) / Total Link )

  10. Earth curvature calculation = Total Link **2 /8 * earth radius

  11. 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(millWatts) + 30

  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 Watts Calculations

  1. mW to dBm = 10Log10(Watts) + 30

  2. dBm to mW = 10(dBm/10)

 




Tutti i loghi e marchi in questo sito sono di proprietą dei rispettivi proprietari.
I commenti sono di proprietą dei rispettivi autori, ed il resto © 2003-2005 di mia proprietą
Questo sito č stato creato con MaxDev, un sistema di gestione di portali scritto in PHP. MD-Pro č un software libero rilasciato sotto la licenza GNU/GPL Visualizzate le nostre news usando il file backend.php

Powered by MD-Pro