# Calculators

### ERP Calculators, Line Loss Calculators and Calculators of All Sorts.

Effective Radiated Power (ERP)
 Calculate Effective Radiated Power (ERP) With Known Transmission Variables: Transmitter Output Power : W or kW Frequency : MHz Transmission Line Type : RG 8 LMR 400 LMR 600 LMR 900 LMR 1200 LMR 1700 1/2" Foam Heliax 5/8" Foam Heliax 7/8" Foam Heliax 1-1/4" Foam Heliax 1-5/8" Foam Heliax 2-1/4" Foam Heliax Transmission Line Length : Feet Antenna Gain : dBd (Not dBi) = W or kW

VSWR / Forward & Reflected Power
 Calculate VSWR, Return Loss, etc. from Forward and Reflected Power: Transmitter Forward Power : Watts System Reflected Power : Watts VSWR = Reflection Coefficient = Return Loss = dB Match Efficiency = % Net Transmission Loss = dB

Volts per Meter and Power Density

Calculate Field Strength in a Free Field

 Power: W Transmit power in watts Gain: dBi Antenna gain in dBi (2.14=Dipole) Distance: m Distance from Radiator in meters Value: V/m dBuV/m dBm/m2

*Note: This assumes network and radiator efficiency but should prove to be a good reference calculator nonetheless, especially in the far field.

Last updated: on June 27, 2013