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Electronics Navigation Telecommunications

RTL-SDR for EPIRB

Introduction EPIRB or Emergency Position Indicating Radio Beacon Station is an emergency transmitting device that blue water sailors or explorers can use in case of distress. They have proven their worth over the years and are absolutely essential for anyone wanting to wander off the grid (Ref.1). At least 2000 people have been saved every […]

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Telecommunications

HF SSB vs. Digital Voice

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 […]

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Navigation Telecommunications

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 […]

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Navigation Telecommunications

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 […]

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Navigation

Celestial Navigation Basics – Aim Off

The sun is shining, it’s early morning and I’m on my deck, Colombian coffee in hand, reading a fantastic book “China Clipper: The Age of the Great Flying Boats” by Robert Gandt (Ref.1). It is the amazing story of the American airline Pan Am crossing the Pacific in 1935. In order to fly safely with […]