AI6VN Maui WebSDR Logo   Maui WebSDR   AI6VN Maui WebSDR Logo

Welcome to the Maui WebSDR!

WebSDR News:

    Notice:  This WebSDR will be going offline end of February/beginning of March

  • This WeBSDR will be shutting down due to the pending sale of the property on which it is located. So far, no-one has suggested an alternative site.

    We are still looking for a new home for this WebSDR.  Obviously, a low RF-noise location is desireable, away from other (frequent) HF transmitters - and a decent Internet connection is a must!

    If you have a suggestion for a new home for this WebSDR, please contact Rob, AI6VN via email at:  rob (at)

Operating tips:

  • You can zoom in and out using the controls under Waterfall view or by overing over the waterfall with the mouse and either drag or use its wheel to adjust it to see the entire frequency range on each band.

  • You can make this screen (text and waterfall) bigger by hitting the CTRL and then pressing the PLUS (+) key.  Conversely, pressing CTRL and the MINUS (-) key will make it smaller

  • If you are using CatSync or similar external programs and find that it doesn't work with this WebSDR - but it seems to work with other WebSDRs - add "?10hz" (not including the quotes, of course) to the end of the URL (e.g.
About this WebSDR

Operated by Rob, AI6VN, this WebSDR operates from Kahakuloa, Hawaii on the island of Maui at an elevation of approximately 400 meters (1300 feet) above sea level.

This system uses a 75 meter long Beverage antenna oriented northeast (approx. 50°) connected to SDRPlay receivers with the WebSDR software running under Linux.

This WebSDR is co-located with the Maui WSPRDaemon receivers, using the same antenna and Internet connection, and is provided for the benefit of amateurs and shortwave listeners - local and worldwide.

About the WSPRDaemon project:  

The WSPRDaemon project is a worldwide endeavor in which WSPR "spots" and receiver noise data is accumulated and made available in an interactive database for propagation analysis - both by amateurs and researchers.

For more information about this project visit the page.

Questions or comments about this WebSDR?  Send them to rob (at)

This WebSDR will time out after 90 minutes if you don't adjust volume, change frequency, etc.  If it does time out, reload the page.

To invoke this page with a preset frequency and mode, append "/?tune=(freq kHz)(mode)" to the URL.  As an example, for 7088 kHz LSB, use:

Other WebSDR systems - Western U.S.:  KFS, Half-Moon Bay, CA  W7RNA, Pheonix, AZ and Northern Utah WebSDR

Eastern U.S.:   K3FEF, Milford, PA, NA5B near Washington DC and N4BBQ, Dalhonega, GA

For more information about the WebSDR project, including a list of WebSDRs worldwide, can be found at

If you aren't hearing audio:

Those using most modern browsers (Chrome, Firefox, Safari) and Apple devices MUST click the "Audio Start" button before audio will be heard.

If you aren't hearing audio, please find and click the Audio Start button which may be found above and to the right of the waterfall.

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 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.

Allow keyboard:
j k ← →: freq down/up (+shift/ctrl/alt faster)
u l c a f: USB, LSB, CW, AM, FM
z Z: center/zoom waterfall
g: enter frequency
m: mute/unmute audio
s: toggle squelch

Frequency: kHz    VFO:  ?  
Enter frequency above, or tune by clicking/dragging/scrollwheel on the frequency scale. freq???
Mode:  ?      
Use the = kHz button to snap to the nearest kHz.

Memories are stored as cookies on your computer, not on the server.

?:   ? 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. PBT/IF Shift by Weert Websdr.
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).

? dBm  Peak ? dBm  ?
 S-meter squelch:        
Mute Squelch Notch1
Notch2 High Boost
 DSP Noise Reduction:
More info about Noise Reduction, Notch2 & High Boost here

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
Try "Alt AGC" for better AM reception, particularly with QSB.

devpk dev_avg dev_pkavg   

Audio channel: Left Both Right

Sig. strength plot:
Waterfall view:
Or use scroll wheel & dragging on waterfall.

Toggle "Hide labels" if labels are missing.

There are currently ? user(s) on this WebSDR:      compact view

Actual CPU utilization percentage is 1/4th of the value shown above.

? devpk dev_avg dev_pkavg freq???