To start with, you need an image of the RPI operating system (Rasbian, based on Debian Linux). At the time of writing this blogpost, the actual version is Debian Stretch. Visit raspberrypi.org for the latest version.Write the image on an…
Categorie: LimaSDR
One of the things that is still unfinished business is the final amplifier and LPF. To be able to check and adjust the LPF, some measurement equipment would come in handy. I stumbled across the following project by Tom, MI0IOU:…
One of the last comments on the entry where I described the installation of quisk on the RPI was that it was up to the user if he/she wanted to add a nice desktop icon. The point is that I…
Today I found some time to do a little soldering. I needed to add an audio amplifier to drive a speaker, so I don’t need to use headphones all the time. This was not needed when I used computers as…
I have purchased a touch panel for the RPI. This makes a very nice compact unit, and I am quite happy with it.
The Raspberry PI2 (RPI2) is a very nice, small and powerful little computer. It is capable of doing all the DSP tasks to decode and code the audio signals to and from the SDR hardware. I managed to install QUISK…
The construction of the control board is underway. It is mainly the Arduino Micro fitted on a prototyping PCB, with some additional hardware (switching transistors, resistors, etc.) and pin headers for connecting it to other parts of the transceiver later…
One of the nice things of this setup is that it uses a soundcard embedded in the unit itself. First of all, it is a good idea to use an external soundcard. The soundcards usually found in laptops are not…
he control electronics have to perform the following tasks: Everything, except point 5 (Bias) is handled by the Arduino Micro microcontroller. I started building it up on my experimenting unit (a power supply with +&- 15V and 5V outputs, and…
Here is the block diagram of the complete system (click on it to enlarge):