Repeater Coil (and Repeater)

Repeater Coil: Also called a Repeat Coil. It's really just a transformer, which converts AC power to the voltages used to charge batteries and to power various devices such as PBXs. Repeater coils also are used for impedance matching, which serves to maximize the power transfer of a signal where two electrical circuits (e.g, twisted pair) are interconnected. The power transfer is improved through the elimination of echo, which is signal reflection back towards the signal source.

Different than a Repeater…

Repeater: Also known as a Regenerative Repeater and a Regenerator. A device inserted at intervals along a digital circuit to regenerate the transmitted signal. As the digital signal transverses the circuit, it loses its shape due to the combined effects of attenuation and noise. Attenuation is weakening of the signal as it transverses the circuit. Noise, or distortion, can be caused by EMI (ElectroMagnetic Interference), RFI (Radio Frequency Interference) frequency shifts internal to the circuit, and various other factors. At some point, the original signal becomes incoherent unless a repeater is placed on the circuit at specific intervals, which are sensitive to the specifics of the circuit design. The repeater is capable of reading the signal, even though it is somewhat attenuated and distorted, reshaping it into proper "ones" and "zeros," and repeating (i.e., retransmitting) it at the proper level of signal strength. Repeaters are used exclusively in digital circuits, whether they are metallic (e.g., twisted pair and coaxial), radio (e.g., cellular, microwave, and satellite), or optical (e.g., optical fiber). Analog circuits make use of amplifiers, which simply serve to boost the signal strength, and which cannot reshape it.