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Welcome to the KFS WebSDR, located six miles south of Half Moon Bay, California USA.

This facility was established by Craig, W6DRZ (sk) and is maintained by a group of local and remote volunteers. Technical descriptions, operating tips, and up-to-date propagation information may be found on the ABOUT page.

More information on the worldwide WebSDR project can be found on www.websdr.org. An outstanding alternate system in the Western USA is Northern Utah WebSDR, north of Salt Lake City. For HF reception from the East coast, use either NA5B WebSDR in Washington, DC. or the K3FEF WebSDR in Pennsylvania.

Possible AUDIO problems with the CHROME web browser

A recent update to the CHROME web browser seems to have resulted in audio issues with this WebSDR and other web sites that stream audio.  In the meantime, if you are having audio problems while using Chrome we suggest that you use a different browser such as Safari, Firefox or Opera until the issues with Chrome's audio are resolved.

For the latest happenings, see the KFS WebSDR News page or go to the LANDING PAGE

Note: On older browsers you need both Java and JavaScript enabled for this page to work properly. For a detailed discussion, click here.
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.

Clicking a band below will switch to the secondary KFS WebSDR server
     
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.


?      compact view
Statistics:
Actual CPU utilization percentage is 1/4th of the value shown above.
? devpk dev_avg dev_pkavg freq???