New Technology for 2020 ~ Life after Field Day
Moving forward by 64 Years from 1956
July 6, 2020 ~ An SDR in your Garage!
A regular reader to this blog shared that he is developing a greater use of a Raspberry Pi to assume more of the workload in a configuration similar to my RADIG.
In the RADIG the RPi3 does the Software part of the SDR. But everything else remains as "analog blocks".
One of those blocks is the USB Synthesizer/controller from SDR-Kits LLC in the UK. Essentially this block is a small board with a ATTiny 45 (or 85) microcontroller and a Si570 along with some voltage regulators and other small components. This board connects to the RPi3 via USB and responds to I2C commands so that at least three important functions are accomplished (there may be more).
First is changing the frequency of the Si570 whose output is at 4X. Downstream is a 74AC74 on the main RADIG Board that creates two quadrature LO signals at the operating frequency (read divide by 4). Secondly commands from Quisk like PTT are translated via a swit…
July 6, 2020 ~ An SDR in your Garage!
A regular reader to this blog shared that he is developing a greater use of a Raspberry Pi to assume more of the workload in a configuration similar to my RADIG.
In the RADIG the RPi3 does the Software part of the SDR. But everything else remains as "analog blocks".
One of those blocks is the USB Synthesizer/controller from SDR-Kits LLC in the UK. Essentially this block is a small board with a ATTiny 45 (or 85) microcontroller and a Si570 along with some voltage regulators and other small components. This board connects to the RPi3 via USB and responds to I2C commands so that at least three important functions are accomplished (there may be more).
First is changing the frequency of the Si570 whose output is at 4X. Downstream is a 74AC74 on the main RADIG Board that creates two quadrature LO signals at the operating frequency (read divide by 4). Secondly commands from Quisk like PTT are translated via a swit…
