DK1ML WebSDR online since 2008
 
This WebSDR receiver is located near Frankfurt/Main. It is operated by Mike DK1ML.
More information about the WebSDR project can be found on http://www.websdr.org.
This is a complete 2025 redesign of the servers, the receiving equipment, the antennas and the user interface.

Back to the new GUI 2025 WebSDR-Version

Antennas & equipment at QRZ.com   Technical specs

Technical Problems? EMail me: websdr@dk1ml.de

      Double click on the bands waterfall to show frequency labels.
Click here for the mobile version
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.
View:
Allow keyboard:

Frequency: kHz   Mode: ?    VFO:  ?  
Enter frequency above, or tune by clicking/dragging/scrollwheel on the frequency scale. freq???

Use the = .00 kHz button to snap to the nearest kHz.      
VFO:
Memories:
Memories are stored as cookies on your computer, not on the server.
Bandwidth:
?:   ? kHz @ -6dB; ? kHz @ -60dB.  Default BW in bold.
 USB CW RX: Check box, or put  ?usbcw  in the URL for USB CW reception.
  CW uses a center frequency of 750 Hz and LSB by default.

PassBand Tuning (PBT):
Use buttons to select BW/mode or drag passband edges on frequency scale.
Logbook:
Call of station that you hear:
Comments, if any:
Time, frequency, your name/call, and DXCC information are added automatically.
View the last 20 lines of the logbook, or the entire logbook
(opens new tab/window).


[scale]
? dBm  Peak ? dBm  ?
 S-Meter Squelch:     
  
Volume:
Mute Squelch Notch1
Notch2 High Boost
 DSP Noise Reduction:
Audio buffering:
  More buffering may help with drop-outs
or slow/jittery connections.
  Vari-Notch (Hz):   Off
   CW Peak (Hz):   Off    Ref. Tone

Gain control:   
RF AGC Alt AGC Manual
Gain:
Try "Alt AGC" for better AM reception.
devpk dev_avg dev_pkavg   
Audio channel: L Both R
Sig. strength plot:
Waterfall view:
Or use scroll wheel &
dragging on waterfall.
Speed:
Size:
View:

Toggle "Hide labels"
if labels are missing.

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

Chatbox: (Read this carefully)
This chatbox is intended to discuss the operation of the WebSDR. ** All visitors are logged.** Any use of foul or inflammatory language will result in your ip being
banned - permanently. Keep it civil! Focus on spots, unique signals, conversation about the receiver, etc.
The operators of this site disclaim any responsibility for text appearing in this chatbox.



Statistics:
? devpk dev_avg dev_pkavg freq???
WebSDR developed by PA3FWM http://www.websdr.org.
Thanks to the folks at the Northern Utah WebSDR for the noise reduction code.
Thanks for the PBT functions to Maasbree WebSDR
Software modifications and extra code lines by DK1ML

Technical specs DK1ML WebSDR:

Antennas:
2m/70cm Diamond X50 40m above ground with filters and 2m+70cm PreAmp, 2xRTL2838 TCXO
23cm Omni 8dBi 40m above ground, RTL2838 TCXO
Qo100 Dish 1.2m, Octagon LNB, locked with Leo Bodnar GPSDO, RTL2838 TCXO
160/80/60/40m Homebrew HiEndFed-Dipole 40m long, 40m above ground, forrest side, 2x RTL-Blog V4
20m Homebrew Wirebeam pointing to USA/Asia, 40m above ground, rooftop, RTL-Blog V4
6m Dual-Band Dipole H-Pol., 40m above ground, FunCube V2 Pro+

Receivers:
4x RTL-SDR Blog V4, Rafael Micro R828D tuner
4x RTL-SDR TXCO, Rafael Micro R820T tuner
2x FunCube V2 Pro+
Leo Bodnar GPSDO

Servers:
Main:
Intel(R) I7 Quadcore 4x4Ghz, 32GB Ram, 1TB SSDs
Backup:
Intel(R) Core(TM)2 Quad 4x2.40GHz, 16GB Ram

20 USB ports (8 USB controller)
Running Ubuntu Linux

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