This is a WebSDR receiver, located in Silec, Poland, QTH KO04SD. It is operated by Argon. The receiver is RTL-SDR with more stable clock source, upconverter, and some GNU Radio magic. Still work in progress. More information about the WebSDR project can be found on

Note: We experience some ISP related problems lately, because of living at the end of the world it might take some time to sort out. Sorry.

Note: for listening to UVB-76 / UZB-76 / МДЖБ / ЖУОЗ / Buzzer, please try: It could help saving some bandwidth.

You might consider supporting us, this will help us paying our bills and improve things. More to come soon!

It seems you are using a mobile device; click here to switch to the mobile version of this site.
It seems Java is not installed or disabled on your computer. You need to install and/or enable it for this website to work properly.
Since Java version 7u51, Java needs to be enabled separately for each website; see for instructions.
Your browser does not seem to support HTML5 WebAudio; please try a recent version of Firefox, Chrome, Opera or Safari; or switch to Java.

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

Gain control: automatic manual

Signal strength plot:
Call of station that you hear:
Comments, if any:
Note: time, frequency, your name/call, and DXCC information are added automatically.
View the last 20 lines of the logbook, or the entire logbook (ctrl-click for new tab/window).

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.