Category: Telecommunications

Introduction 64QAM or 64 Level Quadrature Amplitude Modulation is a digital modulation technique used as a basic building block within the OFDM Orthogonal Frequency Division Multiplexing waveform used in Cellular Telephony LTE & 5G networks (Ref.1). QAM modulation encodes information into the different amplitude and phase levels of a carrier wave. Construction One way to… Continue reading 64QAM for LTE_5G

Introduction In the previous posts I looked at MSK144 and FSK441 which are WSJT-X/WSJT digital communications protocols or so called “fast modes” used for Meteor Scatter. In this post I will look at FT8 (Ref.1 & Ref.2) which is part of the WSJT-X series of protocols used for weak signal communication over all the HF/VHF… Continue reading WSJT-X FT8 Modulator – Scicos Simulation

ScicosLab/Scicos is an Open Source Math Program that can be used in various engineering and scientific applications. In this post I look at how an AM Modulator can be built using the Editor in ScicosLab and also with the visual block Editor Scicos with the Modnum Toolbox. Video ScicosLab/Scicos – AM Modulator Download “Learn Telecommunications… Continue reading ScicosLab & Scicos – AM Modulator

In a previous post Ref.1 I looked at VOACAP and it’s use in a simple off air receive situation. In this post I will delve a little further into the software and compare the results against some simple mathematical models. VOACAP (Voice of America Coverage Analysis Program) is free professional high-frequency (HF) propagation prediction software… Continue reading VOACAP – CHU to VE3PKC+

VOACAP (Voice of America Coverage Analysis Program) is free professional high-frequency (HF) propagation prediction software from NTIA/ITS, originally developed for Voice of America (VOA). In this video we will study the propagation between the time signal station CHU located in Ottawa Canada with a receiver located at VE3PKC in Toronto Canada. The actual received signal… Continue reading VOACAP – CHU to VE3PKC