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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)

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 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