Introduction In my previous post I looked at the latest version of FreeDV RADE (Ref.1). The threshold performance compared to SSB is very impressive and the sound is much more natural than earlier versions. So the next step is to capture an off air signal to see how it sounds. Rx Setup Figure 1 shows… Continue reading HF Digital Voice RADE Off Air Rx
HF SSB vs. Digital Voice Radio AutoEncoder RADE
Introduction Back in October of 2020 during the Pandemic, I looked at FreeDV 1.4.1 an Amateur Radio digital voice program and compared it to standard HF SSB (Ref1). I used Scicos for the simulation of SSB & FreeDV with added noise. I found the FreeDV threshold at least 6dB better than just regular SSB. In… Continue reading HF SSB vs. Digital Voice Radio AutoEncoder RADE
BMA400 3 Axis Accelerometer on Raspberry Pi Pico 2
Introduction In the previous post I looked at interfacing the ICM20948 9DOF IMU with the Raspberry Pi Pico 2 (Ref.1). In this post I examine interfacing the Bosch BMA400 3 axis accelerometer with the Pico 2. The BMA400 breakout pcb is extremely small and lends itself to small portable instruments (Ref.2). Raspberry Pi Pico 2… Continue reading BMA400 3 Axis Accelerometer on Raspberry Pi Pico 2
ICM20948 9DOF IMU on Raspberry Pi Pico 2
Introduction In previous posts I looked at using the ICM20948 9DOF IMU with Raspberry Pi4B and Arduino Uno (Ref.1/2). The ICM20948 is a replacement for the MPU9250 (now end of life) on the popular GY-91 board often used with OpenPlotter. The Raspberry Pi Pico 2 is a very small microcontroller that lends itself to remote… Continue reading ICM20948 9DOF IMU on Raspberry Pi Pico 2
RTL-SDR for MARMOTsat CubeSat_2m
Introduction During the past two years I have been able to successfully receive CubeSats CANVAS, ENSO, Veronika and EIRSAT-1 (Ref.1/4). Recently a new Canadian 3U CubeSat MARMOTsat was launched by SpaceX Transporter 17 on July 7th 2026 (Ref.5). MARMOTSat has 3 transmitters in the 10m/2m/70cm bands. Technical details are given in Ref.6/7. Equipment Setup Figure… Continue reading RTL-SDR for MARMOTsat CubeSat_2m