high frequency channel

fixed frequency channel

audio-frequency channel

video-frequency (vision) channel

low-frequency channel

radio-frequency channel

pulse repetition frequency (PRF) / pulse-repetition frequency

high frequency (HF)

high frequency direction finder

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

high-frequency 'X-band' system

super high frequency weapon

high frequency transducer

high-frequency sound waves

very high-frequency omnidirectional range / omnirange (VOR)

ultra-high frequency

high frequency band

high frequency communication system (HF)

high-frequency communication

high-frequency communication facilities

high-frequency transceiver

very high-frequency omnirange / omnidirectional range (VOR)

extremely high frequency phased array tracking radar

high pulse repetition frequency (HPRF)

high pulse repetition frequency radar

high-pulse repetition frequency waveform

very high frequency (VHF)

high altitude-high opening (HAHO)

high pay-off target / high-payoff target (HPT)

high-burst / high burst (HB)

high road; high-road

high-power illuminator radar / high power illuminating radar (HIPIR)

high-performance / high performance