Introduction In a recent YouTube video I saw a demonstration of a commercial HF radio communicating over a distance of 90Km using NVIS and digital voice. Using SSB the received signal was barely above noise level, and hardly decipherable. However, when the digital voice modem was switched on, the signal was very clear. I decided… Continue reading HF SSB vs. Digital Voice
Category: Telecommunications
Telecommunications: Propagation, HF, VHF, UHF, uWave
RTL-SDR for LF Beacons
Introduction In my previous post (Ref.1) I examined how the RTL-SDR with the up converter can be used to receive the LF/MF/HF bands. Low power radio navigation beacons are located in the LF band and can be received by the RTL-SDR. Figure 1 shows a table of LF radio navigation beacons located in the Toronto… Continue reading RTL-SDR for LF Beacons
RTL-SDR for HF 0-30MHz
Introduction The standard RTL-SDR receives from 25 – 1725MHz, which does not include the LF band from 30-300KHz, the MF band from 300KHz – 3MHz and the HF band from 3 – 30MHz. However with the use of an up-converter, these bands can be received (100KHz – 65MHz). Fig.1 shows the 1st version of the… Continue reading RTL-SDR for HF 0-30MHz
RTL-SDR for Marine HF Weather Fax
Introduction Up to date weather information is critical for sailors and can make the difference between a safe or a hazardous passage. Marine HF Weather Fax has been working reliably for many years and is an independent source of valuable information. NOAA’s Marine Weather Fax page (Ref.1) has all the information you need to use… Continue reading RTL-SDR for Marine HF Weather Fax
Scilab & ScicosLab – Scicos Visual Blocks
Scilab and ScicosLab are Open Source Math Programs that can be used in various engineering and scientific applications. I use ScicosLab with the Modnum tool box in all my Telecommunications work, but both Scilab/ScicosLab can be used for all the mathematics involved in my CelNav EBook. In a previous post (Ref.1) I introduced the programs… Continue reading Scilab & ScicosLab – Scicos Visual Blocks