AI6VN Maui WebSDR Logo   Maui WebSDR   AI6VN Maui WebSDR Logo

Welcome to the Maui WebSDR!


WebSDR News:

  • May 8, 2023 - We have determined that the 17 meter receiver has failed. As a work-around, the 80 meter receiver has been reconfigured via some software trickery to provide both 80 and 60 meter signals and the freed-up 60 meter receiver has been retuned to 17 meters. Due to a hardware quirk, the 80 meter receiver has a weak response to 20 meter signals - but this isn't expected to be a problem when 80 meters is open and 20 meters is more or less closed. A new receiver for 17 meters has been ordered and will be installed at the earliest opportunity.
Hardware:

    The receivers being used are a combination of SDRPlay RSP1a and RSP2 units and the new drivers allow 16 bits of signal data - as opposed to the 8 bits with the previous configuration, allowing better simultaneous dynamic range on each covered band. The new server has more processing power and - most importantly - more USB ports, allowing more bands with wider coverage than before. All available USB ports are being used, so adding more receivers is not possible with the current hardware.

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. http://mauisdr.com:8901/?10hz)
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 WSPRDaemon.org page.

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

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:

http://mauisdr.wsprdaemon.org:8901?tune=7088lsb

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 http://www.websdr.org.

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 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:
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:  ?      
   VFO:
Use the = kHz button to snap to the nearest kHz.

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. PBT/IF Shift by Weert Websdr.
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:
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
Gain:
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.
Speed:
Size:
View:

Toggle "Hide labels" if labels are missing.


There are currently ? user(s) on this WebSDR:      compact view
Statistics:
Actual CPU utilization percentage is 1/4th of the value shown above.
? devpk dev_avg dev_pkavg freq???