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.

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

RTL-SDR for Marine GMDSS/DSC on RaspberryPi4

Introduction In my last post I looked at using the RTL-SDR for receiving Marine GMDSS/DSC signals on HF/VHF (Ref.1). Reception was done using Multipsk on Windows 10. In this post I examine using the RTL-SDR as a stand alone Marine VHF DSC receiver operating on the RaspberryPi4B. The RaspberryPi4B is configured for remote operation off… Continue reading RTL-SDR for Marine GMDSS/DSC on RaspberryPi4

RTL-SDR for Marine GMDSS/DSC on MULTIPSK

Introduction Recently I received an interesting question from Scott in Vancouver about Marine Channel 70 and DSC Digital Selective Calling. DSC is a part of the GMDSS Global Maritime Distress and Safety System (Ref.1/2). It can be used by ships on the MF/HF bands or in the VHF band. The ship MMSI identifier can be… Continue reading RTL-SDR for Marine GMDSS/DSC on MULTIPSK