AI6VN Maui WebSDR Logo   Maui WebSDR   AI6VN Maui WebSDR Logo

Welcome to the Maui WebSDR!

This system is currently undergoing testing -  Expect occasional outages as things get sorted out.

There is an intermittent local interference issue that is being analyzed:  We hope to have a resolution to this problem soon.

Frequency coverage:
  • 60 Meters:  This receiver is usable from 5310 through 5425 kHz.

  • 40 Meters:  This receiver is usable from 6890 through 7370 kHz.

  • 20 Meters:  This receiver is usable from 13960 through 14445 kHz.

  • Note:  80 meters was dropped in favor of 60 meters by request and due to the current availability of receiver hardware.

  • Other bands may be added in the future - let us know what you'd like to see!

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.  Of course, pressing CTRL and the MINUS (-) key will make it smaller
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 pointed northeast (approx. 50°) connected to SDRPlay receivers with the WebSDR software running under Linux on an Atomic Pi PC.

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:

If you are using an Apple computer and/or using the Chrome browser, you may need to click on the IOS Audio Start or Chrome Audio Start buttons below.

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

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

Use the = kHz button to snap to the nearest kHz.

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

? dBm    peak ? dBm
Mute Squelch Autonotch
Notch2 High Boost
 DSP Noise Reduction:
More info about Noise Reduction, Notch2 & High Boost here

Audio buffering:
  May help with drop-outs and/or slow/jittery connections.

Gain control: AGC on manual

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

Toggle "Hide Labels" if labels are missing.
? kHz @ -6dB; ? kHz @ -60dB.  Default BW in bold.
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).

This WebSDR is now being used by ? listener(s):      compact view

Actual CPU utilization percentage is 1/2 of the value shown above.