Testing Sharp Slicer: Multiple Spectrum Slices via SDR# with an Airspy SDR

Youssef the author of SDR# has recently released an update which adds a feature called "Sharp Slicer". This feature allows Airspy SDR users to open multiple instances of SDR#, each able to tune to a seperate signal within the currently tuned frequency range of the SDR. This is somewhat similar to the old multi-VFO plugin from rtl-sdr.ru, however the advantage of Slicer is that you can have seperate spectrum and waterfall graphs for each signal. This could be especially useful for monitoring multiple narrowband HF modes with an Airspy HF+ Discovery. 

To use Sharp Slicer you must have an Airspy SDR, be it an Airspy Mini/R2 or HF+/Discovery. Unfortunately it will not work with RTL-SDR or other SDRs. Once the SDR is running in SDR#, simply press the "+" button on the top left to open a new Slicer instance. It seems possible to open as many instances as you want, and probably the only limitation is your CPU. On our Intel i7-6700 we tested up to 8 instances running at the maximum bandwidth of an Airspy Mini, and the SDR# CPU utilization was only at 50%.

A nice touch is that you can also see the location of each VFO on the master SDR# instance, and the color can be changed on each Slicer instance.

Over on Twitter @ea3ibc has also been testing:

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RF Guy

can we get a peak max. spectrum marker in sdr-sharp ?


hey Guys!
1) It should be possible to:
– Reduce the Bandwith to use less CPU
– disable the Waterfall,… to use less GPU power

2) How to manage the Audio Output? Are there Seperate Audio Output possible with an Virtual Audio stuff?
Here you can have up to 5 Audio Channels: https://vb-audio.com/Cable/ with low cost.

3) How does the work? Those the open relay X different connection to the SDR? So its possible to use X different Bands?