Telecommunications, Navigation & Electronics

Introduction In previous videos I looked at HF propagation using WWV, CHU and NCDXF/IARU beacons (Refs.1/4). Recently the Canadian CHU time station was taken off the air. In this post I will look at receiving WWV using the SDR-IQ receiver and a 10m long wire as shown in Figure 1. WWV station frequencies are 2.5/5/10/15/20/25MHz.… Continue reading SDR-IQ for HF WWV Propagation

Introduction In my previous post I looked at the latest version of FreeDV RADE (Ref.1). The threshold performance compared to SSB is very impressive and the sound is much more natural than earlier versions. So the next step is to capture an off air signal to see how it sounds. Rx Setup Figure 1 shows… Continue reading HF Digital Voice RADE Off Air Rx

Introduction Back in October of 2020 during the Pandemic, I looked at FreeDV 1.4.1 an Amateur Radio digital voice program and compared it to standard HF SSB (Ref1). I used Scicos for the simulation of SSB & FreeDV with added noise. I found the FreeDV threshold at least 6dB better than just regular SSB. In… Continue reading HF SSB vs. Digital Voice Radio AutoEncoder RADE