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.

If you're new to WebSDRs, have a look at the quick start guide written by G0POT.

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 here and some older pictures here. 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: