Number Stations Research The Number Stations Listeners Starter Guide is a guide dedicated for people who want to start listening in to transmissions on shortwave radio or military/number station communications.
This guide contains information on how to use a Software defined Radio (SDR), buying and owning your own SDR, Signal reception and identification basics and much more. In addition to our guides, we also list the important frequencies of military and number stations as well as an SDR list for these stations.
Shortwave Radio SDR Operation Basics
See the SDR list at the bottom for more remote receiver locations. One of the more popular options is uTwente’s WebSDR.
Tune around the radio by using mouse. Scroll around the waterfall with the left mouse button or with mouse wheel when holding the mouse on the tuner. You can zoom the waterfall with a mouse wheel when holding on it. The frequencies are below the waterfall. Note: other online radios use Megahertz not kilohertz. This radio uses kHz in its display. The difference between kHz and mHz are such 9450 kHz and 9.450 MHz, 14996 and 14.996 MHz. Place the dot between. The kHz is mostly used in shortwave only the VHF and UHF use the MHz .
To recognize the signal mode by using waterfall. The typical broadcast stations use AM. If you tune to them with USB selected you will hear duck speaking voices or strange noises made by music. If you select AM you should hear them correctly. AM BC station can be easily recognized my its carrier that looks like long line and audio coming from both sides. Shortwave broadcasters use 5 Hz steps. For instance the station should be tuned properly at 7200, or 7205, 7210, 7215 and so on. However, pirates or clandestine broadcasters may not use 5 Hz step so you must find the correct frequency yourself. Usually the location of the carrier indicates it.
The CW is most oldest and simple way or radio communicating. Amateurs, navy, army and the spies use it. CW is meant for Morse Code, you will recognize the Morse code with it usual dits and dots sound. On waterfall it looks like fast moving broken lines coming up. You can use USB mode to listen to them but CW is required to decode it properly. Note the CW is most narrowest mode and uses the left side of the spectrum…
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