Electromagnetic wave

Related wiki pages: SWR, Propagation, Electronic Theory, harmonics

The image below is of a pure sine wave <math> y = sinx </math>

• The Amplitude of the wave a is the distance from the median line of the wave to either a peak or a trough.

• The wavelength <math> \lambda </math> is the distance betwwen two corresponding point on successive waves, and is measured in metres.

• The period of a wave is the time it takes for it to pass a fixed reference point, and is measured in seconds.

• Frequency is the number of waves that pass a fixed reference point per second, with units Hertz (Hz) where 1 Hz = 1 complete cycle per second.

The velocity of electromagnetic waves is close to the speed of light in the atmosphere, approximately 300 000 000 m/s.

Some Math

• Velocity = Frequency x Wavelength <math> v = f \times \lambda </math>

• Period = 1/frequency <math> p = \frac {1}{f} </math>

Electronic Theory
Physical quantities	Current * Gain * Impedance * Power * Q of a circuit * Radiated Power Measurement * Reactance* Resistivity * Resonance * Voltage
Components	Baluns * Bipolar-Junction Transistors * Capacitors * Diodes * Inductors* Lasers * Microphones * Resistors * Transformers * Wire
Circuits	Attenuators * Digital Signal Processing (DSP) * Dummy load * Filters * LC filters * Power Supply Design * Rectifier Circuits
Design	Amplifier Design * Oscillator Design
Electromagnetic Waves	Relative power (Decibels) * Harmonics * Interference and BPL

Propagation and radio wave theory
Propagation	Aurora * E-Skip * IPS * Lightning scatter * Meteor scatter * Satellites * Trans-Equatorial Propagation * Tropospheric ducting
Interference	QRM * QRN
Theory	Electromagnetic Waves * Frequency Wavelength and Period