Digital voice is exploding! That’s the title of HamRadioNow episode 193 where Gary KN4AQ interviews David Rowe VK5DGR, creator of Codec2 and co-author of FreeDV.
open source
Qtmm souncard modem decoding APRS data from the ISS
Yesterday I successfully received APRS transmissions from the International Space Station on 145.825 MHz using my Yaesu FT-817 connected to my MacBook Pro via a Signalink audio interface and a USB sound adapter.
Qtmm soundcard modem for decoding AFSK1200
Last week I started on a new experiment trying to integrate the AFSK1200 demodulator code from multimon into a simple Qt-based graphical application. This experiment had two objectives:
- Test the feasibility of integrating the AFSK1200 demodulator from multimon into other applications.
- Try using the QAudio framework from Qt for audio I/O that should work on both Linux, Windows and Mac OS X.
Module-wide satellite selection in Gpredict
Up until now, users of Gpredict could click on a satellite in any view to make that satellite selected. For most views, selecting a satellite meant highlighting it and showing some additional info about it, or for the case of single satellite view to display the data for that satellite. In case you are not familiar with the terms module and view in Gpredict, a module is a logical object which groups a number of satellites and a ground station together, while views are the display widgets used to visualize the satellite data in different ways like map, list, polar plot, etc. A module can have any number of views laid out in a grid.
Gpredict 1.3 released
Gpredict 1.3 has been packaged and released. The source code is already available from the SourceForge download site. Binary packages will follow soon.
Improved search in the Gpredict saetllite selector
Charles AA1VS has done some cool tweaking to the search functionality in the Gpredict satellite selector. Check out the video below to see how it works.
Test driving Quisk SDR
Before getting my hands all dirty with adding UHD driver to Quisk, I decided to take it for a test drive using some pre-recorded samples. I have used a 250 ksps recording of the HO-68 / XW-1 linear transponder downlink that I have recorded on November 9, 2010 using the USRP and the RFX400 daughterboard.
Getting into space when you’re broke
A very interesting and inspirational talk given by Kristian von Bengtson of Copenhagen Suborbitals at TEDx Copenghagen on November 30, 2010.
Gpredict 1.2 released
After one year of development, bug fixing and testing we have decided that it was time to make a new release of Gpredict. This release features several new features such as the rewritten layout engine as well as lots of bug fixes.
Nice review of Gpredict
I stumbled upon this nice review of Gpredict Jack Wallen at ghacks.net : Track satellites with Gpredict. It’s always good to hear what other people think about it and I was particularly happy to read that Gpredict is an incredibly simple to use tool that will allow anyone to track multiple satellites quickly and easily. … Read more