http://websdr.ewi.utwente.nl:8901/

            Amateur radio club ETGD                Faculty for Electrical Engineering,
VERON       PI4THT                                 Mathematics and Computer Science                 UT
                                      Wide-band WebSDR

On this page you can listen to and control a short-wave receiver
located at the amateur radio club ETGD at the University of Twente.
In contrast to other web-controlled receivers, this receiver can be
tuned by multiple users simultaneously, thanks to the use of
Software-Defined Radio.

This site, which in 2008 was the very first WebSDR site ever, was
finally reactivated in July 2012 after an interruption of more than
1.5 years; read also the old news since then.

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[picture of the SDR hardware] The system is currently composed of a
"Mini-Whip" antenna, a homebuilt SDR board (as pictured; see here for
background) which samples the entire shortwave spectrum and sends all
of this via a gigabit ethernet link to a PC, where a special version
of the WebSDR server software processes it. The Mini-Whip is based on
a design from PA0RDT (google finds it); see some pictures. The active
receiving element is about 5 by 10 cm large. Such an antenna only
works well with a good grounding; ours is on top of a 20m high
building, the upper part of which is all metal.
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Other services available on this system:
 
WSPR reception
 
Chirp signal reception
 
Entire day waterfall display
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Questions and remarks about this WebSDR can be sent to the developer
and maintainer: pa3fwm@websdr.org (but please check the FAQ first).
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[ ]
 
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 http://websdr.org/java.html 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.
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View:
Allow keyboard: [ ]

j k - -   freq. down/up (+shift/ctrl/alt faster)
u l c a f USB, LSB, CW, AM, FM
W w       filter wider/narrower
z Z ^Z    center/zoom waterfall
g         enter frequency
b B       change band
m V v     mute, volume up/down
t T       VFOs: toggle A/B, set A=B

Click here to start audio: [start audio]

[edgelower] [edgeupper]
[carrier]

[---] [--] [-] [          ] kHz [submit]    [A/B] [A=B]
[---] [--] [-] [.0] [+] [++] [+++]
CW LSB USB AM FM AMsync
Volume: [0                   ] [ ]mute
Filter: ? kHz narrower wider
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[ ]squelch [ ]autonotch [ ]noise reduction
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Audio recording start
Your browser does not seem to support downloading the recording;
please try a recent version of Firefox, Chrome or Opera.
 


[scale]
? dBm; peak ? dBm
Waterfall zoom
[-][+]
[band]
[><][<>]

(*) Waterfall settings ( ) Memories ( ) users ( ) Chatbox ( ) Logbook
( ) Station info ( ) S-meter plot ( ) Advanced
[zoom out][zoom in]
[max out][band][max in]
Or use scroll wheel and dragging on waterfall.
Speed:
(*)slow
( )medium
( )fast

Size:
( )small
(*)medium
( )large
( )extra large
View:
( )spectrum
(*)waterfall

Brightness:
[128                 ]
[ ]More contrast
[ ]Full window width
[ ]"sticky"

[store] [label] [download CSV] [upload CSV & append] 
[upload CSV & replace] [delete all] [undo] Drag memories to reorder
or delete.
[trashcan]
[                    ] [                    ]
This WebSDR is currently being used by ? user(s) simultaneously:     
[ ]compact view
Chatbox:
This chatbox is intended to discuss the operation of the WebSDR.
Please keep the discussion civil and polite; that also means no
swearing ("four-letter words").
The operators of this site disclaim any responsibility for text
appearing in this chatbox.

Please keep in mind this chatbox is shared with often hundreds of
users; don't use it for chatter; use it ONLY for messages about the
operation and use of this WebSDR, and about the signals received with
it.
[                                                                                ]

Please calculate = [    ] [chatbox submit]      [paste freq&mode]

Logbook:
Call of station that you hear: [            ]
Comments, if any: [                              ] [submit]
Note: time, frequency, your name/call, and DXCC information are added
automatically.

[refresh] View the last 100 lines of the logbook, or the entire
logbook (ctrl-click for new tab/window).
Station information:
Lookup in databases: [fmscan.org] [mwlist.org] [qrg.globaltuners.com]
[short-wave.info] [clear] [refresh]


[fast] [slow] [stop] [clear]
Advanced settings - only change these if you know what you're doing
[Reset to defaults]
Noise reduction level: (*)automatic ( )manual
[0                   ]
Squelchlevel:
[0                   ]
Audio out: ( )left (*)both ( )right

Gain control: (*)automatic ( )manual ( )limit
Hang time: [0                   ]
Gain: [0                   ]  dB

[ ]More playback buffering
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Statistics:
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