| A | B |
|---|
| Reception | When an electromagnetic wave induces a voltage in an antenna |
| Selection | The ability to distinguish a particular frequency from all other frequencies that are present. |
| Detection | The extraction of intelligence from an RF signal. |
| Reproduction | The action of converting electrical signal into sound waves that can be interpreted by the ear. |
| Intelligence | Information or data that is meant to be communicated. |
| Fidelity | The receiver's ability to accurately reproduce the original intelligence. |
| Sensitivity | The measure of a receiver's ability to reproduce intelligence from very weak signals. |
| Noise | Undesired signals; the limiting factor for sensitivity. |
| CW | Intelligence is the RF carrier being switched on and off. |
| AM | intelligence is used to modulate the amplitude of the RF carrier. |
| FM | Intelligence is used to modulate the frequency of the RF carrier. |
| FSK | Intelligence is used to modulate by shifting the RF carrier by a pre-determined amount. |
| ISB | Two separate intelligences are used to modulate two different sidebands, independently of each other. |
| SSB | Allows improved efficiency, less power, and less bandwidth. |
| System | a combination of sets, groups, units, assemblies, subassemblies, and parts joined together to perform one or more operational functions. |
| Set | A combination of units, assemblies, subassemblies, and parts to perform a specific function. |
| Group | A combination of units, assemblies, subassemblies, and parts, but NOT able to perform a specific function. |
| Unit | A combination of assemblies, subassemblies, and parts mounted together. |
| Assembly | A combination of subassemblies, and parts mounted together. |
| Subassembly | Two or more parts that form a portion of an assembly. |
| Part | One component, such as a resistor, a capacitor, or a transistor. |
| Gain | Amount of amplification |
