VHF Marine Propagation with Radio Mobile

Introduction In a recent post I was considering a hypothetical 2m amateur radio repeater and studying its VHF coverage with a Yagi antenna (Ref.1). In the process I read an article describing the difference in results of using the Longley-Rice & ITWOM propagation models (Ref2). The researchers used the Radio Mobile program developed by Roger… Continue reading VHF Marine Propagation with Radio Mobile

RTL-SDR for VHF Air_AM/VHF Marine_FM Weather & Cyber Security

Introduction The RTL-SDR can conveniently be used to check both VHF Air & VHF Marine weather. Figure 1 shows the receive schematic. Recently a significant cyber security outage affected millions of Windows computers all around the world. I offer two simple solutions that can be easily applied before more outages happen. Receive Block Diagram Figure… Continue reading RTL-SDR for VHF Air_AM/VHF Marine_FM Weather & Cyber Security