Topband: SDR/DSP pulls out signals HOW FAR down in the noise?

[shristov]

Mike Waters W0BTU <mrscience65704 at yahoo.com> wrote:


> "As an example of the filtering features, listen to these two audio samples.
> In the first, a CW CQ EME is made completely inaudible by static crashes.
> The second sample is the same audio file, but filtered trough the Noise Blanker 
> feature of Winrad."

> Listen to the two audio files. It is simply amazing.


Those two files are completely unrelated, even the duration is not the same.

The file http://www.sdrham.com/bin/cq_unfiltered.mp3
has a very weak signal on 650 Hz.

The file http://www.sdrham.com/bin/cq_filtered_by_Winrad.mp3
has a much stronger signal on 600 Hz.

A possible explanation is that the same station
has been recorded, but at different times.


73,

Sinisa  YT1NT, VE3EA