They also observe certain standards of etiquette and ethics. Amateurs play a significant role in providing communication links when needed, particularly in times of natural disaster. It is a wonderful fraternity which over-rides the boundaries of nationality, politics and religion. Virtually every country in the world has an umbrella amateur radio organization. If you are a newcomer to radio and are keen to pursue it as a hobby then contact the amateur radio organization for your region.
Help is available everywhere.
This is the unit of electrical current flow. The rate at which current flows past a given point. An attenuator is a passive network comprising usually, but not always, resistors that reduce the power or voltage level of a signal without introducing significant distortion. This is a relative power unit. Direct current is where at all times the voltage polarity remains constant.