This is a WebSDR receiver of R3S project, located in Russia, Ryazan region (loc. KO94VS). It is operated by RA3SAD.
More information about the WebSDR project can be found on


С сентября 2018 года наблюдается проблема в браузерах Chrome в виде сильного постороннего шума при работе WebSDR.
В качестве обходного пути необходимо выключить и включить звук, используя галочку Mute.
Инженеры Chromium изучают проблему.
Как альтернатива - используйте другой браузер, например FireFox.

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Allow keyboard:
j k ← →: freq down/up (+shift/ctrl/alt faster)
u l c a f: USB, LSB, CW, AM, FM
z Z: center/zoom waterfall
g: enter frequency

Frequency: kHz

Or tune by clicking/dragging/scrollwheel on the frequency scale.

? kHz @ -6dB; ? kHz @ -60dB.
Or drag the passband edges on the frequency scale.
Waterfall view:
Or use scroll wheel and dragging on waterfall.

? dB; peak ? dB;
mute squelch autonotch
Signal strength plot:

This WebSDR is currently being used by ? user(s) simultaneously:      compact view

This chatbox is intended to discuss the operation of the WebSDR.
The operators of this site disclaim any responsibility for text appearing in this chatbox.