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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.

Radio and Antenna    
Transmit Power Antenna Gain Power
 mW
OR
 dBm		  dB(i)  dB
Cable Loss    
Cable Properties
(per 100 ft or m)		 Cable Length  
 dB (100 ft)
OR
 dB (100 m)		  feet
OR
 meters		  dB
Connector Loss    
Frequency in MHz No. of Connectors  
 MHz.  No.  dB
Budget    
   dB

 

Free Space Loss

Calculations and equations used.

Frequency Distance   Result
 MHz  Km
OR
 Miles		  dB

 

Fresnel Zones

Calculations and equations used.

Total Link Obstacle Distance 1st Fresnel Zone Radius
 Km
OR
 Miles		  Km
OR
 Miles		  m
at
 Km		  ft
at
 Miles
Frequency   60% No Obstacle Radius
 MHz    m  ft
  Earth Height (mid-point)
     m  ft

 

System Performance

Calculations and equations used.

Frequency Distance   Result
 MHz  Km
OR  Miles		    dB
TX Power TX Cable TX Antenna  
 dBm
OR
 mW		  dBm  dB  dB
RX Sensitivity RX Cable RX Antenna  
 dBm  dB  dB  dB
Margin RX Power SAD Factor Theoretical Margin
 dBm  %  dB

 

milliWatts to dBm (and vice versa)

Calculations and equations used.

Transmit Power   Result
mW  dBm
Power Ratio   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)

 

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