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410 links - and 4 categories

International SWL DX Contest 2023 - The international SWL Contest is oen to SWL all over the world. You can use a real radio receiver or a kiwi or web SDR. We have many sponsors who will give nice gift for best listeners of AM radios on SW and MW.
[ Hits: 34 | Votes: 2 | Rating: 5.5 ]

Evolution of Car Radios: From Marconi to Motorola - his historical account traces the development of car radios from Marconi's mobile wireless telegraph station on a steam engine vehicle in 1901 to Motorola's iconic car radio models in the 1930s. It highlights key milestones such as Alfred Grebe's radio-telephone experiments on Long Island and the introduction of Marconi-Phone 8 radios by the Daimler Company in England. The narrative explores technological advancements, including the transition from TRF to Super-Heterodyne circuitry and the integration of push-button controls. The evolution from vacuum tubes to transistors and compact discs is also documented, showcasing the continuous innovation in automotive entertainment systems.
[ Hits: 51 | Votes: 1 | Rating: 1 ]

Ribbit digital text messaging mode for HF/VHF/UHF - Ribbit is a novel digital text messaging mode for VHF/UHF communications for recreational and emergency use which radically increases the density of information transmitted by spectrum used. It leverages the computing power of the modern smartphone to increase the capabilities of any Handy Talkie without requiring any additional hardware or cable. A Ribbit message is fixed in duration at 1250 milliseconds. It is sent over audio modulation with a 2kHz bandwidth centered on 1.5kHz. It is preceded by 400ms of white noise to open analog squelch circuits.
[ Hits: 133 | Votes: 1 | Rating: 10 ]

Pi-Star Digital Voice Software - Pi-Star is a software image built initially for the Raspberry Pi. The design concept is simple, provide the complex services and configuration for Digital Voice on Amateur radio in a way that makes it easily accessible to anyone just starting out, but make it configurable enough to be interesting for those of us who cannot help but tinker.
[ Hits: 87 | Votes: 1 | Rating: 10 ]

DragonOS Focal - DragonOS is a linux distribution dedicate to Software Defined Radio. It leverages the portability, security, and power of Lubuntu Linux as a delivery package and operating environment for a pre-installed suite of the most powerful and accessible open source SDR software. DragonOS has verified support for a range of inexpensive and powerful SDR hardware, including RTL-SDR, HackRF One, LimeSDR, BladeRF, and many others.
[ Hits: 205 | Votes: 0 | Rating: 0 ]

Hostilog - Hostilog is a logging program for HamRadio it uses a very easy way to enter qso data without any usage of a mouse. You can enter around 300 to 400 QSOs per hour from a paper written logbook, which is really quick compared to other logging programs. Combining and sorting of ADI Files are included
[ Hits: 62 | Votes: 0 | Rating: 0 ]

A Simple Morse Code Project: The Tiny Keyer - In his journey to improve Morse code skills, the author developed a straightforward device named the Tiny Keyer using Arduino. Tailored for Morse code enthusiasts and ham radio operators, this project utilized the budget-friendly Arduino ATTiny 85 Kickstarter board. With straightforward setup procedures in the Arduino IDE, the Tiny Keyer's small size and low cost make it accessible for beginners and hobbyist clubs interested in Morse code exploration.
[ Hits: 52 | Votes: 0 | Rating: 0 ]

DIY 1KW Dummy Load - F5NPV explores the construction of a cost-effective 1KW dummy load for radio enthusiasts. Purchasing a commercial dummy load can be expensive, but with basic materials such as a metal can, resistors, mineral oil, and a heat dissipator, you can build your own. The article provides a simple guide to assembling the load, including the importance of testing for inductance. The DIY dummy load yields impressive performance, with an SWR of 1.2:1 across multiple bands and the ability to handle up to 1KW of power. This budget-friendly solution is a valuable addition to any radio shack.
[ Hits: 121 | Votes: 0 | Rating: 0 ]

RF-Quiet Solar PV for Ham Radio - This article discusses the potential for solar power systems to coexist harmoniously with amateur radio, challenging the notion that they are inherently incompatible. Drawing from personal experience, the author emphasizes the importance of selecting RF-quiet components, focusing on series-string Sunny Boy grid-tie inverters. The article also highlights considerations for system design and limitations based on roof orientation, shading, and array size. Overall, it presents a valuable perspective on creating a radio-friendly solar PV setup.
[ Hits: 78 | Votes: 1 | Rating: 1 ]

Baofeng UV5R TRRS Adapter - A tiny board, which allows a smartphone or similiar device to connect to the Baofeng UV5R radio via a TRRS audio connector. It allows for connecting the radio to a software TNC app such as APRSDroid or PocketPacket. Solder on the components, solder on the cables, then provide some stress relief, (I use solid-core wire and heat shrink tubing), and you can use your UV5R with your smartphone for APRS on the cheap.
[ Hits: 91 | Votes: 0 | Rating: 0 ]