Introduction In many previous posts I have examined the use of the RTL-SDR with GNU Radio and on RaspberryPi4 (Ref.1/5). The combination makes an inexpensive, simple and rugged platform for the reception of a variety of signals. Figure 1 shows a typical implementation. The RTL-SDR is used to receive a Marine Weather signal at 162.4MHz… Continue reading GNU Radio Embedded Python Block for RaspberryPi4 GPIO
Category: Telecommunications
Telecommunications: Propagation, HF, VHF, UHF, uWave
OpenPlotter3 Headless For GPS & RTL-SDR AIS on RPi4
Introduction Recently I was asked a question about AIS & OpenPlotter. I looked at various aspects of OpenPlotter2 several years ago (Ref.1/11) so I thought it would be a good idea to revisit the latest version3 of the Program. I downloaded RPi4_32bit images for Starter & Headless. Starter Image Setup I first downloaded the RPi4_32bit… Continue reading OpenPlotter3 Headless For GPS & RTL-SDR AIS on RPi4
Si5351 Clock Generator I2C
Introduction In two previous posts I looked at programming the Si5351A clock generator with the Arduino (Ref.1/2). In this post I examine the I2C bus used for communication between the Arduino and Si5351A module. Using a digital scope, the bus can be decoded to compare the program instructions with what was actually sent for trouble… Continue reading Si5351 Clock Generator I2C
Si5351 Clock Generator Programming+
Introduction In a recent post I looked at getting started with the Si5351A Clock Generator (Ref.1). In order to proceed quickly, I used an Adafruit module with the Si5351A and an onboard 25MHz crystal clock. The module was interfaced with an Arduino Uno and programmed with software from the Adafruit library. This produced 3 frequencies… Continue reading Si5351 Clock Generator Programming+
Splat! – Digital Elevation Data with QGIS
Introduction Splat! (Ref.1) is a very versatile propagation prediction program that I discussed in several previous posts. In my first post, I looked at installation on Windows and Linux, how to obtain the digital elevation data files, create QTH & LRP files, and run a simple point to point analysis (Ref.2). In the second and… Continue reading Splat! – Digital Elevation Data with QGIS