Transmit RF frequency subtract to the Receive frequency
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RF=Radio Frequency, a wave that is used to send data wirelessly
A sweep test is a method that determines the frequency response of a cable by its generation of RF voltage. This frequency should be varied at a rapid constant rate.
RF is short for Right Fielder. In the context of the category where this question was posted, RF probably refers to "radio frequency". "Radio frequency" usually refers to a rate of oscillation in the range of about 30 kHz (30,000 cycles per second) to 300 GHz (300,000,000,000 cycles per second). This is the range of frequencies of electromagnetic signals we call radio waves. Although RF usually refers to electrical rather than mechanical oscillations, mechanical oscillations in this range can also be referred to as "RF" (that use is a bit obscure though).
Since this is listed in Electronics Engineering, RF stands for "Radio Frequency" (There is other possible definitions for "RF"). Radio Frequency: An electromagnet wave that has a frequency varying from 3kHz to 300GHz. The original answer: in baseball "rf" means right field, the 9th position. In some apartments its a sign(RF) outside the doors in red telling firefighter about a lightweight truss roof. BTW Im a firefighter ''R'' roof ''F'' floor .
Remote controls use both infrared and radio frequency technologies. Your typical TV remote uses infrared and your typical car remote uses RF.