Posted a copy of my "HPSDR Update" slides from the Sept 2007 ARRL/TAPR DCC.
Posted a copy of "Janus - A Sound Card designed for Software Defined Radios". This is a paper Phil Harman (VK6APH) and I did for the 2006 ARRL/TAPR DCC that talks about the design of the Janus card for HPSDR. Has some good comparisons of various hi end audio codecs.
Posted some plots of the radio spectrum in Austin done using my newly acquired HP8590B Spectrum Analyzer.
I've posted my presentation on "SoftRock and HPSDR" from Austin Summerfest here.
Posted a writeup on some interesting spectrum pics I came across writing code to interface PowerSDR to the Xylo Wolfson FPGA lash up I've been working on.
Posted pictures of some scope traces from a 20 meter SoftRock V5
Posted pictures of the new Soft Rock v5 boards.
Posted details on adding computer tuning control to the Hamtronics R139 Weather Fax Receiver. I'm now using this to automatically tune my R139 receiver.
Added a page on KB9YIG's Soft Rock 40 receiver. The Soft Rock 40 is a simple software defined receiver to 40 meters.
Started an SDR-1000 Notebook and added a writeup on CAT control for PowerSDR.
Added a writeup on my SDR-1000 setup.
Wrote up diagnosis of the frequency wobble I'm seeing on my SDR-1000. Much to my surprise the case fan seems to be causing it.
Wrote up results for the 2003 ARRL Frequency Measurement test. A little behind on my web updating as the results on this were announced in February 2004!
Posted results of looking at the frequency wobble I saw playing with QRSS on the SDR 1000.
Posted a writeup on doing some QRSS work with the SDR-1000. Seeing some frequency wavering that I do not understand on the SDR-1000.
Posted a writeup on the PC IR Remote Control Xceiver circuit I've been playing with lately.
Field Day pictures are now posted.
Added a writeup on my latest project, an FM Stereo transmitter.
Added a writeup on some QRSS monitoring I've been playing with lately. QRSS is a mode used to copy signals at QRPp levels -- 100 mW or less typically.
Have done a major update to the site to get some more recent content out here and to make it easier to navigate and easier to maintain. Hopefully I will not be so far behind in updating this site with the new layout.
Comments to: Bill Tracey (kd5tfd@ewjt.com)
Last Updated: 4 November 2005
Copyright © Bill Tracey 2005