Related by context. Frequent words. (Click for all words.) 40 analogue 39 oscillators 38 analog 36 oscillator 36 frequencies 35 signals 35 modulation 35 modulator 34 oscillations 33 transmitters 33 Analog 33 VHF 32 transmitter 32 polarity 32 modulated 32 wavelengths 31 waveform 31 signal 30 transmit 30 frequency 29 analog signals 29 electrical impulses 29 transmits 28 electromagnetic waves 28 cellular 27 waveforms 26 transmitting 25 blips 25 decoded 25 signaling 25 infra red 25 radio frequency 25 transceivers 24 radio transmitters 24 detects 24 circuitry 23 vibrations 23 radio frequencies 23 transceiver 23 photons 23 transponder 23 pulses 23 broadcasts 23 sensing 23 sensors 22 audible 22 antennas 22 beeps 21 stimuli 21 Signals 21 gauges 20 transmissions 20 antennae 19 triggers 19 directional 19 transponders 19 beacons 19 repeaters 18 radios 18 telemetry 18 decode 18 readout 17 cues 17 beep 17 bearish signal 17 decoding 16 buoys 16 patterns 16 blinking 16 Signalling 16 antenna 16 satellite 15 indicates 15 telltale signs 15 impulses 14 decoders 14 radio transmissions 14 Signal 14 indicating 14 indicator 13 visual cues 13 noises 13 warning 12 distress signal 12 GPS satellites 12 signposts 11 warnings 10 barometers 10 message 10 indications 10 messages 9 signs 9 indicators 8 signify 8 clues 8 data 7 conflicting signals 6 indication 3 portents 3 signaled 0 hints