The 100Hz range of 10.140000-10.140100MHz in the 30m band is used by weak-signal experimenters using very slow-speed (QRSS) signaling, often decoded visually.

This page is a spectral image of the QRSS band segment as received at W1BW. The two-minute blank periods are during transmit periods, when I simultaneously transmit a WSPR signal and a "flying W" spectral motif.   I variously use one of several radios for 30m:

• FlexRadio SDR-1000 with an HPSDR Ozy/Janus interface, all clocked by a Trimble Thunderbolt GPSDO for precise frequency measurement.
• Softrock rxtx6.2 30m/40m with Edirol FA-66 audio device.
• ICOM IC-703+

At the moment, the SDR-1000 is doing the 30m work, and the antenna is an end-fed halfwave vertical wire.

Images are captured with Wolfgang Buescher's (DL4YHF) Spectrum Lab software and uploaded every 10 minutes.

I2NDT maintains a compendium of similar grabbers around the world.  The last 24 hours of W1BW grabber images are availble as a slideshow.

600m Grabber

I have temporarily set up the grabber on the experimental 600m band.  Rig is the IC-703+, and the antenna is a temporary ~50m longwire.