My SDR – PCB

In a few words, I completed my 4 layers board, the gerber files were sent and I’m now waiting for it. This prototype is design to work on the 40m band, because it’s easier for me to debug it at these low frequencies. The next versions will operate at 145MHz and 1.3GHz, with an IQ and a classic mixer. The different parts could be clearly identified on the board (power, microcontroller, ref clock, Ethernet, RX mixer, TX mixer, PA, RX filterbank, TX filterbank) and I tried to keep it as simple as possible.

The next step is to solder SMC components (small 0603 for res & cap) and test the microcode. All the data will send over Ethernet and HDSDR will process it, if everything works fine 🙂

 

TinySDR, my SDR board, for receiving/transmitting over Ethernet

Update : Production process @ Beta Layout

 

My SDR – Ethernet link part

I finally started my big SDR project, and this week-end, a major piece has fallen. I wrote the microcode for the PIC32 microcontroller and debugged the communication between the PC software (a plugin for HDSDR) and the device. This part can be resumed to a sound card over Ethernet. Most of SDR hardware required to be close to the computer (ex. USB connection or audio connection to the sound card) and my wish is to build a full SDR system that could be operated remotely and placed close to the antenna. Above all, this is important for the hyperfrequency because the loss in the coaxial cable are important at these frequencies.

The next step is now to design and build the PCB. This is not really a problem and this is the funny part for me. A few more efforts and I will be able to play with my full SDR system 🙂

PIC32 Dev Kit sending the UDP data to HDSDR