Things have been a little quiet on the SDR front and the bands have been lousy. Behind the scenes WIBR is being fine tuned in the "test" branch of the SVN, and diversity is moving ahead.
Above is the latest "polar" control for the diversity project. The control allows you to adjust phase and gain between 2 antennas and 2 receivers in the F5K. Here is a shot of the F5K with diversity active
This morning I was on early playing with the diversity feature. I used the controls to null the band noise. Below is a recording of a very weak CW station. As I click the diversity off and on, you can hear the band noise reduced in a way that takes the station from about a R-3 to R-5. I didn't have a lot of time to explore this as I was transcoding the file and loading it up to my server before I had to scoot, but I thought the demonstration dramatic enough to warrant a little display.
Sorry for the low audio you will probably need some cans to truly hear the difference. This station was at the noise about -119 on 40M. My diversity set up on 40 is a 65 ft end fed half wave antenna and a 45 ft vertical that is tuned remotely at its base. Both antennas are very close in output and seperated by about 180ft or 3/2 wave on 40. The signals are pretty independent since you can see very different AGC action on the panadapter of the 2 receivers.
Eventually tuning this feature will be automated. Its an interesting evolution to witness.
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.