The FFT or Fast Fourier Transform was described by Cooley & Tukey in their 1965 paper “An Algorithm For The Machine Calculation of Complex Fourier Series” (Ref.1). The method has earlier roots in the works of Carl Gauss and others (Ref.2). The purpose of the FFT is to reduce the calculation complexity of the DFT… Continue reading FFT – A Telecommunications Revolution
Author: Jeremy Clark
GNU Radio ATSC_8VSB Transmitter Simulation
In the previous post, I discussed using Splat! to predict the receive level of an RF signal. In particular I considered CBLFT UHF CH25 as received from the CN Tower as shown above in Figure 1. In order to study ATSC_8VSB which is the DTV standard used in North America, GNU Radio can be used… Continue reading GNU Radio ATSC_8VSB Transmitter Simulation
Splat! RF Signal Propagation, Loss and Terrain Analysis Tool
About Splat! Splat! is an RF Signal Propagation, Loss, And Terrain analysis tool for the electromagnetic spectrum between 20 MHz and 20 GHz. Splat! software is Copyright © 1997-2018 by John Magliacane KD2BD. Ref.1. Splat! is free software. It may be redistributed and/or modified under the terms of the GNU General Public License Version 2… Continue reading Splat! RF Signal Propagation, Loss and Terrain Analysis Tool
Create Any Waveform on Your Function Generator
Function Generators typically produce Sine, Square, Triangle, Saw Tooth and DC signals. Many modern instruments include an AWG or Arbitrary Waveform Generator signal as an additional selection. This allows you to construct your own custom waveform to meet your testing needs. Typical examples might be a dual/multi tone audio signal to test intermodulation distortion in… Continue reading Create Any Waveform on Your Function Generator
RTL-SDR for Weather Radio
A simple RTL-SDR receiver can be used to receive marine weather forecasts. The unit is small and inexpensive (approx. $25). It can be controlled by using the software program SDR# or other similar programs. The picture above shows my unit plugged into the usb port on the left side of my laptop, the display shows… Continue reading RTL-SDR for Weather Radio