( ( ( radio frequency ) ( -LRB- ( RF -RRB- ) ) ) ( ( ( ( ( ( Any ( of ( ( the ( electromagnetic ( wave frequencies ) ) ) ( within ( ( the range ) ( that ( ( extends ( from ( below ( 3 kHz ) ) ) ) ( to ( ( approximately 300 ) GHz ) ) ) ) ) ) ) ) ) , ) and ) include ) ( ( the frequencies ) ( used ( for ( radio ( and ( television transmissions ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN radio) (NN frequency)) (PRN (-LRB- -LRB-) (NP (NNP RF)) (-RRB- -RRB-))) (VP (VBP Any) (PP (IN of) (NP (NP (DT the) (JJ electromagnetic) (NN wave) (NNS frequencies)) (PP (IN within) (NP (NP (DT the) (NN range)) (SBAR (WHNP (WDT that)) (S (VP (VBZ extends) (PP (IN from) (PP (IN below) (NP (CD 3) (NN kHz)))) (PP (TO to) (NP (QP (RB approximately) (CD 300)) (NNS GHz)))))))))) (, ,) (CC and) (VBP include) (NP (NP (DT the) (NNS frequencies)) (VP (VBN used) (PP (IN for) (NP (NN radio) (CC and) (NN television) (NNS transmissions)))))) (. .)))
radio frequency (RF) Any of the electromagnetic wave frequencies within the range that extends from below 3 kHz to approximately 300 GHz, and include the frequencies used for radio and television transmissions.
(ROOT (S (NP (NNP Am) (NN radio) (NNS waves)) (VP (VBP exist) (PRT (RP in)) (NP (DT the) (ADJP (QP (CD 540) (TO to) (CD 1600))) (NN khz) (NN frequency) (NN range))) (. .)))