VERON Amateur radio club ETGD
PI4THT		 Faculty for Electrical Engineering, 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.

[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.
Other services available on this system:
WSPR reception
Chirp signal reception
Entire day waterfall display
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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View:
Allow keyboard:
j k ← →freq. down/up (+shift/ctrl/alt faster)
u l c a fUSB, LSB, CW, AM, FM
W wfilter wider/narrower
z Z ^Zcenter/zoom waterfall
genter frequency
b Bchange band
m V vmute, volume up/down
t TVFOs: toggle A/B, set A=B


kHz   
Volume: mute
Filter: ? kHz
squelch autonotch noise reduction
 


[scale]
? dBm; peak ? dBm
Waterfall zoom






Or use scroll wheel and dragging on waterfall.
Speed:
slow
medium
fast

Size:
small
medium
large
extra large
View:
spectrum
waterfall

Brightness:

More contrast


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 =     

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

View the last 100 lines of the logbook, or the entire logbook (ctrl-click for new tab/window).
Station information:
Lookup in databases:


Advanced settings - only change these if you know what you're doing
Noise reduction level: automatic manual
Squelchlevel:
Audio out: left both right

Gain control: automatic manual limit
Hang time:
Gain:  dB

More playback buffering
Statistics: