high frequency direction finder

auditory direction finder

automatic direction finder (ADF)

radio direction finder

automatic direction finder

radiosonde tracking radio direction finder

radiotelephone direction finder

direction finder

direction finder exercise

direction finder installation (station)

direction finder team

direction-finder bearing

direction-finder evaluator

direction-finder operator

direction-finder station

pulse repetition frequency (PRF) / pulse-repetition frequency

high frequency (HF)

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 channel

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)