Introduction In the previous two posts we looked at using the RTL-SDR on Raspberry Pi4 with GNU Radio. We examined four applications: displaying the FM band spectrum, wide-band FM, narrow-band Marine weather, and finally AM reception. In this post we look at the RTL-SDR for SSB reception on GNU Radio. The latest version of GNU… Continue reading RTL-SDR for SSB on GNU Radio
QAM Quadrature Amplitude Modulation – Analog
Introduction In previous posts we looked at AM Amplitude Modulation for analog transmission (Ref.1) and QAM Quadrature Amplitude Modulation for digital transmission (Ref.2). In this post we will examine QAM for analog transmission. We first look at sending two independent tones; one tone on the In Phase I channel and another tone on the Quadrature… Continue reading QAM Quadrature Amplitude Modulation – Analog
RTL-SDR for AM on GNU Radio
Introduction In the previous post we looked at using the RTL-SDR on Raspberry Pi4 with GNU Radio and Gqrx. We examined three applications: displaying the FM band spectrum, wide-band FM reception and narrow-band Marine weather reception. In this post we look at the RTL-SDR for AM reception on GNU Radio. The latest version of GNU… Continue reading RTL-SDR for AM on GNU Radio
RTL-SDR on Raspberry Pi4
Introduction When I was about eight years old, I received a “Rocket Radio” for Christmas. It was about six inches high, red and looked like a small rocket. It had a sliding rod which acted as a tuning inductor for the crystal receiver inside. I spent hours listening to the various powerful AM stations, with… Continue reading RTL-SDR on Raspberry Pi4
ADS-B Out Basics
Introduction ADS-B Automatic Dependent Surveillance Broadcast (Ref.1) is an avionics system that allows planes to transmit their navigational status on a periodic basis without interrogation. It is an outgrowth of the ATCRBS Air Traffic Control Remote Beacon System – Mode A, Mode C and Mode S (Ref.2). It is a particular case of Mode S… Continue reading ADS-B Out Basics