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
AIS & GNSS on OpenCPN ECN Charts
Introduction In the previous post I looked at receiving AIS on OpenCPN using the latest ECN charts for the Montreal harbour (Ref.1). Since 2017 I have been using Raster BSB charts. In this post I compare various chart formats such as Paper, Raster BSB and ENC. ENC charts are vector charts and contain a wealth… Continue reading AIS & GNSS on OpenCPN ECN Charts