carrier-frequency amplification

radio-frequency amplification

light amplification by stimulated emission of radiation (laser)

Microwave Amplification by Stimulated Emission of Radiation (maser)

pulse repetition frequency (PRF) / pulse-repetition frequency

troop-carrier squadron / troop carrier squadron

common frequency

doppler frequency shift

fixed frequency channel

frequency

frequency and directional chart

frequency band

frequency intelligence

frequency modulated (FM)

frequency modulation (FM)

frequency range (band)

frequency response

frequency, intensity, time, type (FITT)

frequency-hopping mode

guarded frequency

high frequency (HF)

high frequency direction finder

high frequency over-the-horizon (HF OTH) radar

high-frequency 'X-band' system

intermediate frequency

low frequency (LF)

operating frequency

operational frequency

preset frequency

protected frequency

radio frequency (RF)

radio frequency explosive device

radio frequency identification (RFID)