Distance and band conditions
The server calculates who is audible to each listener and how the selected band and distance affect the received signal.
Virtual amateur radio transceiver
KODEN
Experience a shared, noisy HF spectrum in your browser. Koden models propagation, fading, interference and antenna direction so every station hears its own version of the band.
The live radio opens in a new tab. A microphone is required only when transmitting.
USB14.275.00M0AI · 20 M
SignalS7
PropagationVariable
AF GainRF GainFilterPTT
Access
Modern browserNo installation required for the web client.Spectrum
Shared and dynamicEach listener receives a uniquely impaired audio mix.Geometry
Real grid squaresDistance, bearing and beam heading affect readability.Station memory
Saved by callsignVFOs, controls, audio devices and antenna settings return next visit.How the virtual ether works
Radio behaviour, not clean conference audio.
QSB, noise and interference
Signals fade, atmospheric static moves through the passband, birdies appear and meteor scatter can create brief openings.
Directional beam modelling
Real Maidenhead grid squares provide distance and bearing. A rotatable beam's heading and gain pattern change what you hear.
Two VFOs and station memory
Band, mode, VFO, memories, receiver controls, antenna heading and device choices persist against your callsign.
Web now, desktop developing
The React browser transceiver is playable now. Native Windows and Debian clients are being developed against the same protocol.
Built in TypeScript and C++
Shared band-plan, grid and protocol packages support the server, browser client and early-stage native JUCE desktop application.
M0AI
Always-on AI station
Call M0AI on 14.275 MHz USB.
M0AI operates from a Leeds grid square and handles a pileup one caller at a time. Its strength depends on the same bearing, distance, antenna and propagation model as every other station. It uses phonetics, signal reports and IARU Region 1 operating convention.