IS0GRB 432MHz WebSDR Receiver

located in Dolianova, 250m above sea-level. South Sardinia island, Italy, JM49OJ
is operated by Roberto IS0GRB, e-mail is0grb@gmail.com
It is running on a QuadCore Linux Ubuntu Server x64, 16GB RAM, SSD Disk 500GB
Antenna is Turnstile + 20dB Preamplif. + 10m Cellflex 1/2'' cable + SDR interface GPSDO
http://websdr.is0grb.it:8904      Click here for Mobile version (Android/IOS) Firefox
This WebSDR has been activated on April 20, 2026
This WebSDR enable you to listen UHF 70cm Traffic from 432.000 to 433.000 MHz

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  View:
Allow keyboard:
j k ← →: freq down/up (+shift/ctrl/alt faster)
[l c f] [u i o] [a s d]: [LSB2.5, CW, FM]  [USB2.4, USB2.5, USB2.7]  [USB-D1, USB-D2, USB-D3]
z / Z: center / zoom waterfall    g: enter frequency    q / w: mute / unmute audio

Insert your Spot:
Call of station that you are hearing (Only DX):   Comments, if any:
View the last 30 spots, or the entire list of spots (ctrl-click for new tab/window).


Frequency: kHz   Mode:?

Or tune by clicking/dragging/scrollwheel on the frequency scale.
Waterfall view:   To enlarge the window spectrum (Hold Left CTRL and + or - key)
Speed:   Size:
View:  
       QRZ Callsign lookup:

 QRZCQ Callsign lookup:

   Callsign map + Locator: 		UTC
Memories:
Bandwidth:
? kHz @ -6dB; ? kHz @ -60dB
Volume:
DSP Noise Reduction:
Audio buffer:
Audio AGC Auto Manual
Gain:

[scale]

Sig?dBm  Peak?dBm

Noise?dBm  SNR?dB

Mute Squelch Autonotch High Boost
Signal strength plot:


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

Chatbox:
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.



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