Final answer:
Carrier frequency equipment is used for transmitting voice and telemetering signals at high frequencies over power transmission circuits. Higher frequencies like VHF (54 to 88 MHz) and microwaves are suitable for carrying more information and are used in satellite and long-distance communications.
Step-by-step explanation:
Carrier frequency equipment provides high frequency voltages to be used for transmitting voice communication or telemetering signals on high voltage transmission circuits. Voltages in the ranges of 120 to 700 kV are commonly used for transmitting power over long distances, utilizing step-up transformers to increase the voltage at the power station exit. Voice communications and telemetering signals require higher frequencies, such as very high frequencies (VHF) in the range of 54 to 88 MHz, because it's possible to carry more information per unit time on these high frequencies. Additionally, most satellite-transmitted information and land-based long-distance transmissions use microwaves due to their suitability for communications thanks to the ability to carry large amounts of data quickly, although they do require a clear line of sight between the transmitter and receiver due to short wavelengths.