This is a WebSDR receiver, located in Athens, GR It is operated by SV1BTL, e-mail:
The receiver is Airspy HF Discovery. Antenna: Multiband End Fed Half Wave Antenna MyAntennas EFHW-8010, Preselector by SV1AFN. Precious help from SV2AMK. (read the tutorial)
More information about the WebSDR project can be found on
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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
b: change band

This SV1BTL WebSDR  is currently being used by ? user(s) simultaneously:      Mobile Version           

Frequency:   kHz.    Mode: ?
Please enter the frequency above.
Or tune by clicking/dragging/scrollwheel on the frequency scale.

Ham. Bands
Other non Ham Bands
Radio Bands

Switch to another websdr server
Memories are stored as cookies on your computer, not on the server.
? kHz @ -6dB; ? kHz @ -60dB.

IF filter shift:
Or drag the passband edges on the frequency scale.
Waterfall view:
Or use scroll wheel and dragging on waterfall.

   S? dBm    Peak ? dBm

Mute Squelch High Boost
Autonotch Notch1 Notch2
 DSP NR: More info here
Audio buffering:

Gain control: AGC on Manual

Signal strength plot:


Call of station that you hear:

Note: time, frequency, your name/call,
and DXCC information are added automatically.
View the last 20 lines of the logbook,
or the entire logbook.

Callsign lookup by    
Callsign lookup by    
QTH locator by QTH-Locator:   

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.