IS0GRB VHF WebSDR Receiver

located in Dolianova, 250m above sea-level. South Sardinia island, Italy, JM49OJ
is operated by Roberto IS0GRB, e-mail
It is running on a QuadCore Linux Ubuntu Server x64, 16GB RAM, SSD Disk 500GB
Turnstile Antenna 1/4 spacing + 20dB Preamplif. + 20m Cellflex 1/2'' cable + SDR interface GPSDO     Click here for Mobile version (Android/IOS) Firefox
This WebSDR has been activated on January 3, 2020
This is the IS0GRB VHF WebSDR project diagram
This WebSDR enable you to listen SSB DX, Local FM and Satellite Traffic
If you want to know which Satellites is receiving this WebSDR (JM49OJ):
Click here for the Sat Passes Amateur Satellite Tracking Online by LU7ABF

 See also IS0GRB QO-100 (Es'Hail-2) Geostationary Satellite WebSDR
If you have sound problems with Google Chrome click or follow these steps:
1. Next to the url Google Chrome will indicate an icon "Unsafe Site"
2. Click on this item, select "Site settings" and Enable Audio for this site
3. Refresh now this page with F5. You can try instead to use Opera browser or Firefox
- See also this page to fix audio problems when using the Chrome and Safari browsers:

 04/01/2020 - Video Filippo IZ5TEP listens to himself via satellite through this WebSDR
 22/01/2020 - Recording on this WebSDR of the Sked by Luca Parmitano from ISS with the Ontario Science Center in Toronto, Canada.
Sat Passes Amateur Satellite Tracking Online by LU7ABF for Locator JM49OJ

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Allow keyboard:
j k ← →: freq down/up (+shift/ctrl/alt faster)
[l c f] [u i o] [a s d]: [LSB, CW, FM]  [USB]
z / Z: center / zoom waterfall    g: enter frequency    q / w: mute / unmute audio

  To enlarge the window spectrum zoom the page (Hold Left CTRL and the + key)

Frequency: kHz   Mode:?

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

       QRZ Callsign lookup:

 QRZCQ Callsign lookup:

? kHz @ -6dB; ? kHz @ -60dB
Or drag the passband edges on the frequency scale.

Waterfall view:



Sig?dBm  Peak?dBm

Noise?dBm  SNR?dB

mute squelch autonotch

Audio buffering:
Useful with drop-outs and/or slow/jittery connections.
Above the waterfall allowing the keyboard:
mute/unmute audio with q/w. Useful for RX/TX

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.


Free counters!