Fiber Optics.infoFiber-Optics.info

 
 


UHF


Abbreviation for ultra high frequency. The frequencies, ranging from 300 MHz to 3000 MHz, in the electromagnetic spectrum. Contains off-air television channels 21-68.

 


UL


Abbreviation for Underwriter’s Laboratory. An organization that tests product safety for a wide variety of products. UL approved products carry the symbol shown at right.

UL
 


Unidirectional


Operating in one direction only.

Unidirectional
 


Unity Gain


A concept in which all the amplifiers in a cascade are in balance with their power inputs and outputs. Unity gain can be achieved by adjusting the receiver output, either by padding or attenuation in the node, to the proper level determined by the RF input.

 




UV


Abbreviation for ultraviolet. That portion of the electromagnetic spectrum in which the longest wavelength is just below the visible spectrum, extending from approximately 4 nm to 400 nm.