Introduction I want to do some experiments in the amateur radio 433MHz/70cm band. So I was looking for an LNA/BPF as I used in previous experiments. I found two units on line, one in a metal case and one on an open PCB. The PCB unit arrived first, so I tested it using white noise.… Continue reading PlutoSDR for 433MHz/70cm LNA Testing on GNURadio
Category: Telecommunications
Telecommunications: Propagation, HF, VHF, UHF, uWave
Si5351 Clock Generator Spectrum on GNURadio
Introduction In previous posts I looked at programming the Si5351A clock generator for IQ quadrature and for simple single frequency output using Arduino (Ref.1/4). When used with amateur radio receivers and transmitters, we have to keep in mind that we are not dealing with a sinusoidal source but a square wave. From Fourier theory, a… Continue reading Si5351 Clock Generator Spectrum on GNURadio
OpenPlotter4 on RPi4 – AIS/GNSS/Sensors
Introduction In previous posts I looked at OpenPlotter2, then recently OpenPlotter3 (Ref.1/6). I looked at various aspects including GPS, AIS, WeFax, Navtex and Sensors. In this post I will look at OpenPlotter4 on RPi4 with AIS, GNSS and Sensors. Installation Figure 2 shows the OPV4 starter image which I downloaded from Ref.7. Then I used… Continue reading OpenPlotter4 on RPi4 – AIS/GNSS/Sensors
GNSS & AIScatcher on RaspberryPi4
Introduction In the previous post I looked at using AIScatcher along with GNSS to plot position and AIS contacts on OpenCPN (Ref.1). AIScatcher is very sensitive and I even managed to pick us contacts at my home location which is surrounded by massive steel condos and is distant from the harbour. In this post I… Continue reading GNSS & AIScatcher on RaspberryPi4
GNSS & AIScatcher on OpenCPN
Introduction In recent posts I have been looking at using my new GNSS receiver on various maps such as OpenStreetMap and OpenCPN (Ref.1/4). Yesterday I received an email from a colleague who told me about AIS Catcher, a new multi-platform AIS software (Ref.5). I downloaded it and tested it from my home QTH. Tech Minds… Continue reading GNSS & AIScatcher on OpenCPN