Introduction Recently I read several posts on various amateur radio forums regarding the reception of Shortwave Radiogram broadcasts. VOA Radiogram was a Voice of America program that experimented with various digital transmission modes, starting in March 2013. It was superseded by Shortwave Radiogram (Ref.1). I decided I would try reception using the very popular RTL-SDR… Continue reading RTL-SDR for Shortwave Radiogram
Author: Jeremy Clark
Jeremy Clark is a Senior Telecommunications Engineer and Advanced Amateur Radio Operator VE3PKC. He is the author of E-Books on Telecommunications, Navigation & Electronics.
OpenPlotter – Sensors_a
Introduction In previous posts we examined how to install OpenPlotter (Ref.1), how to connect a GPS receiver (Ref.2), how to connect AIS (Ref.3), and how to receive VHF (Ref.4). In this post we will examine how to connect & detect a sensor module such as the GY-91 which is referenced in OpenPlotter documentation. This module… Continue reading OpenPlotter – Sensors_a
I2C Programming & Scope Detection
Introduction Recently I have been working with various sensors such as a magnetometer, gyroscope and accelerometer for use in navigational systems (Ref.1). All these sensors are accessed using the I2C protocol. Over the past several years I have worked with various HF synthesizers that were also programmed via I2C. I used a Tektronix TDS210 digital… Continue reading I2C Programming & Scope Detection
Magnetic Navigation
Introduction Since ancient times sailors have used the Earth’s magnetic field for navigation. The compass has its origin in China and was introduced into Western Europe from the Islamic world (Ref.1). My first compass exposure was orienteering on canoe trips in Norther Quebec and then later on a mineral magnetic survey in the Coppermine Area… Continue reading Magnetic Navigation
Celestial Navigation Basics Land Sea & Air – Course_d
Introduction In a previous post (Ref.1) I described how I developed an interest in Celestial Navigation and in my last posts (Ref.2, Ref.3) I explained what I believe to be the important points such as why CelNav is still relevant, the GP Geographic Position, the Navigation Triangle and it’s Trigonometric solution. In this post I… Continue reading Celestial Navigation Basics Land Sea & Air – Course_d