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Welcome to the version 3 upgrade of the KFS WebSDR, located six miles south of Half Moon Bay, California USA. This facility is maintained by Craig, W6DRZ, e-mail w6drz@arrl.net. To read about the new features of this upgrade, click here. A complete technical description, operating tips, updated propagation information, and a donation opportunity can all 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.
Also, check out W7RNA Phoenix WebSDR in Arizona; and AI6VN Maui WebSDR in Hawaii.
For HF reception from the East coast, use either NA5B WebSDR in Washington, DC. or Home of K3FEF & W3TKP in Pennsylvania.

KFS SDR NEWS:
(27 Mar '21) The KFS Radio Club has been issued the callsign W6KFS.
(6 Oct '21) Separate Kiwi receivers are now available on all four TCI antennas. Use this Landing Page for access.
(30 Mar '22) The new upgraded version of the KFS WebSDR is on the air. Please use the new domain kfsdr.com for future access. Questions and comments? Please email Craig.
(7 Apr '22) Thank you to WA6HCX, KE6PTO, KF7GCQ, W6ACC, WA6ZVE, AK6OM, N6MD, KH6PXM, NN6A, W5AWG, WJ6W, and KF6SYD for their recent donations.
(1 May '22) KFS is experiencing problems with its Internet provider that, at times, is causing intermittent audio drop-outs. We are working on a solution to this issue, but in the short term the audio buffer default has been set to 500ms. We thank you for your patience and support!
(27 July '22) Users of Firefox now need to press the "Audio Start" button:  As of Firefox version 103 users of that browser must press the "Firefox/Mozilla audio start" button to get audio. For more information, go to the Firefox Audio Fix 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.



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

Bandwidth:
? kHz @ -6dB; ? kHz @ -60dB.  Default BW in bold.
  CW tunes using LSB and assumes a center frequency of 750 Hz.

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   

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???