Here is a shot of PowerSDR with Bob's DSP test form open. I decided to run some tests on this thing. I have a pair of 80 and 40M verticals that are spaced about 100ft. I fed one vertical into ANT-1 on the F5K, and I fed the other into RX-2. I turned on the DSP Test Form, as shown above.
First I tuned to a broadcast station that is about 4 miles north of me. The signal on my pair of 80/40M verticals were -20 dBm on one vertical and -23 dBm on the other. (aka about 50 over S-9.) In other words its one friggin strong signal. By judicious tuning I was able to completely null this strong signal. This signal is about 30dB stronger than the strongest of signals I ever encounter on the air. Next I tuned to 40M to hear what I could hear. These are a few samples I recorded of QSO's and noise being nulled.
In A you can hear the noise reduction. I tuned to best signal quality and then just clicked enable off and on a few times. This means my noise is a point source comming from a specific location.
In B In this clip you can hear the station fade down into the noise and when I click on the noise canceling he become readable again. The effect was more pronounced at different times during the QSO, but if I record a long QSO the files become huge.
In C is a classic situation. This "maddening" kind of digital noise is completely eliminated from the background.
In D another noise is eliminated virtually completely in a very noisy band
As you can see on the console I have no other noise abatement turned on for this demonstration.
I did run across 2 QSO's on the same freq, and I was able to eliminate one of the QSO's while copying the other using this diversity technique, and then do the opposite, eliminate the other QSO and listen to the QSO I had just notched. Amazing!!! I didn't make a clip of that because the QSO ended just as I got the hang of the tuning and was moving toward the "rec" button.
If you're interested in writing something interesting for this blog regarding your SDR experience let me know. I would like to include things like how your SDR contest station is set up, or your VHF station that uses SDR as the system center, feats of weak signal work or how well the SDR works in various challenging situations. If you are a foreign ham and would like to comment on the growth of SDR in your particular part of the world. Bring it on!
I reserve the right to publish or not, but I'm pretty open to documenting a wide variety of honest experiences from users, for readers to explore. The understanding of SDR in our hobby is so nascent, that I want the reader to be able to see the value of SDR through the eyes of YOUR experience and enthusiasm.