частотна модуляція
frequency-modulation receiver
pulse repetition frequency (PRF) / pulse-repetition frequency
amplitude modulation
modulation
air modulation
amplitude-modulation receiver
modulation index
phase-modulation receiver
angle modulation noise
coherent echo modulation and detection
common frequency
doppler frequency shift
fixed frequency channel
frequency
frequency and directional chart
frequency band
frequency intelligence
frequency modulated (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