Extras - Various calculators

  1. Various calculators

Tools to calculate the following:

  • frequency to wavelength for radio waves
  • conversion of VSWR losses to dB losses
  • metric to Imperial (meters to feet and inches) conversions
  • conversion of reactance value to inductance or capacitance value
  • addition or subtraction of two decibel (dB) values
  • quarter-wave line matching transformer

Frequency / wavelength calculator

Speed of light: m/s
Frequency:  
Wavelength:  

Convert VSWR value to power loss

Any value of VSWR higher than 1:1 can cause power loss due to reflected RF being dissipated in the feeder line: use this to calculate how much power loss is due to VSWR

Power input: W
VSWR value: : 1
Mismatch loss: dB
Percentage loss; %
Reflection coefficient:
Percentage output: %
Power output: W
 

Metric to Imperial units calculator

  • Convert meters to decimal feet, or
  • Convert decimal feet to meters
Meters: m
Feet: ft   =
 

Convert reactance value to inductance or capacitance value

Frequency: MHz
Reactance: Ω
Inductance: µH
Capacitance: pF

Decibel calculator

Add or subtract two decibel (dB) values

Decibel value #1: dB
Decibel value #2: dB
Result: dB

Quarter-wave line matching transformer

The 1/4-wave line matching transformer, also known as a Q-section, is a section of feed-line having a specific impedance designed to transform an input impedance to a different output impedance.

This can be useful when connecting feedlines of different impedances: say, a length of 50Ω coaxial line to a length of 75Ω coaxial line.

The matching 1/4-wave section is connected in series between the input line and the output line, or load.

First impedance,  Zin Ω
Second impedance,  ZL Ω
Matching impedance,  Z0 Ω