InteractiveTools & Simulators
Hands-on tools for understanding transmission and reception technologies. Visualize signals, explore spectra, and interact with communication systems.
Tools
Interactive
Signal Modulation Simulator
Visualize AM, FM, and PM modulation in real-time. Adjust carrier frequency, message, depth, and noise.
Interactive
Audio Signal Samples
Hear real signals — Morse code, AM/FM modulation, numbers stations, dial-up handshake, static noise.
Reference
EM Spectrum Explorer
Interactive reference for the electromagnetic spectrum — from 3 Hz to 300 GHz.
RF Spectrum Map
Explore how the radio spectrum is allocated across frequency bands — from ELF to EHF
RF Spectrum Allocation Map
Scroll to pan · Ctrl+Scroll to zoom · Click a band for details
1.0x
3 Hz
30 Hz
300 Hz
3 kHz
30 kHz
300 kHz
3.0 MHz
30.0 MHz
300.0 MHz
3.0 GHz
30.0 GHz
300.0 GHz
ELF
SLF
ULF
VLF
LF
MF
HF
VHF
UHF
SHF
EHF
ISM 2.4 GHz
ISM 5.8 GHz
GPS L1
GPS L2
CB Radio
Amateur 2m
Amateur 70cm
Marine VHF
Airband
FM Broadcast
5G mmWave
LTE Band 7
ELF
SLF
ULF
VLF
LF
MF
HF
VHF
UHF
SHF
EHF