If you need immediate emergency assistance, the appropriate voice signal is “MAYDAY” and the appropriate Morse code signal is “SOS” Used only in a life threatening situation to you or some one else Derived from the French venez m'aider, meaning "come [to] help me, venez" is dropped, thus MAYDAY. The Proper way to say is to say “MAYDAY” several times I.E. “MAYDAY MAYDAY MAYDAY this is VA3NSC” For CW “SOS” --- … --- If your using a repeater and you want to interrupt a conversation with a distress call, you say “BREAK” twice and then you call sign

■ HAVE BACK UP POWER TO USE YOUR STATIONS IN AN EMERGENCY AND NOT BY COMMERICAL AC LINES ■ HAVE SEVERAL SETS OF BATTEIRS FOR HANDHELDS ■ DIPOLE ANTENNAS ARE A GOOD CHOICE FOR PORTABLE AND OR EMERGENCY HF STATIONS

A power supply (sometimes known as a power supply unit or PSU) is a device or system that supplies electrical or other types of energy to an output load or group of loads. The term is most commonly applied to electrical energy supplies, less often to mechanical ones, and rarely to others.

A transformer is a device that transfers electrical energy from one circuit to another through a shared magnetic field. A changing current in the first circuit (the primary) creates a changing magnetic field; in turn, this magnetic field induces a changing voltage in the second circuit (the secondary). By adding a load to the secondary circuit, one can make current flow in the transformer, thus transferring energy from one circuit to the other.

• A rectifier is an electrical device that converts alternating current to direct current, a process known as rectification. Rectifiers are used as components of power supplies and as detectors of radio signals. Rectifiers may be made of solid state diodes, vacuum tube diodes, mercury arc valves, and other components. • A circuit which performs the opposite function (converting DC to AC) is known as an inverter.

• amplifier is any device that will use a small amount of energy to control a larger amount of energy. • The relationship of the input to the output of an amplifier is usually expressed as a function of the input frequency and is called the transfer function of the amplifier, and the magnitude of the transfer function is termed the gain. • gain is a measure of the ability of a circuit to increase the power or amplitude of a signal. It is usually defined as the mean ratio of the signal output of a system to the signal input of the same system. It may also be defined as the decimal logarithm of the same ratio

Receiver is an electronic circuit that receives its input from an antenna, uses electronic filters to separate a wanted radio signal from all other signals picked up by this antenna, amplifies it to a level suitable for further processing, and finally converts through demodulation and decoding the signal into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc.