Singapore OJ11WH - Operated by Martin 9V1RM

Please note that in order to prevent cheating during DX Expeditions or contests a 15s delay was introduced into the audio feed of this websdr.

Conditions :

The SDR is used primaly for the Reverse Beacon Network and feeds both a CW and an RTTY skimmer. The stats of the skimmer can be found here : http://www.reversebeacon.net/dxsd1/dxsd1.php?f=0&c=9v1rm&t=de

The CW and RTTY skimmer are running on an i7 8700k system with 16 Gb of memory. The WebSDR software runs on an i5 2500k. The I/Q data are feeded using the CWSL_WebSDR extension from Hardy, DL1GLH : http://www.dl1glh.de/cwsl_websdr.html.

More information about the WebSDR project can be found on http://www.websdr.org.

Note: you need both Java and JavaScript enabled for this page to work properly. If you don't hear anything, probably Java is disabled or its version is too old (i.e., pre-1.4.2).

The latest update to Chrome has prevented web pages from automatically playing media when the page loads, this prevents the HTML5 audio stream from working, you can try doing this it worked for me.

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.
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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

Frequency: kHz

Or tune by clicking/dragging/scrollwheel on the frequency scale.

? kHz @ -6dB; ? kHz @ -60dB.
Or drag the passband edges on the frequency scale.
Waterfall view:
Or use scroll wheel and dragging on waterfall.

? dB; peak ? dB;
mute squelch autonotch
Signal strength plot:
Call of station that you hear:
Comments, if any:
Note: time, frequency, your name/call, and DXCC information are added automatically.
View the last 20 lines of the logbook, or the entire logbook (ctrl-click for new tab/window).

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

This chatbox is intended to discuss the operation of the WebSDR.
The operators of this site disclaim any responsibility for text appearing in this chatbox.