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Ham radio 40-meter dipole: your first antenna - How to home made a custom home made dipole antenna for the 40 meters band, just 66 feet long. Enjoy the band openings during the evening and play morse code or digital modes on this magic band.
[ Hits: 198 | Votes: 0 | Rating: 0 ]
Linear Loaded 40m Dipole - Dipole for 40m band. It is a simple linear loaded dipole feeded with 450-Ohm openwire feedline. Designed it for resonance at 7.050 MHz, can be tuned on 30m and 80m bands with an external antenna tuner. Build with simple electrical copper wire (2.5 mmq/13 awg) and two fishing poles with size of about 7 m/23 ft.
[ Hits: 161 | Votes: 0 | Rating: 0 ]

Shortened 80m Antenna - An antenna for 80 meters band for those who does not have enough space to setup a halwave wire dipole that is aprox 130ft or 40 meters. The antenna is an open-wire-fed shortened dipole
[ Hits: 421 | Votes: 1 | Rating: 1 ]

HackRF - open source hardware for software-defined radio. HackRF One is an open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. 1 MHz to 6 GHz operating frequency
[ Hits: 177 | Votes: 3 | Rating: 7.67 ]

AllStarLink - AllStarLink is a network of Amateur Radio repeaters, remote base stations and hot spots accessible to each other via Voice over Internet Protocol. AllStarLink runs on a dedicated computer (including the Rasperry Pi) that you host at your home, radio site or computer center. It is based on the open source Asterisk PBX running our app_rpt application.
[ Hits: 123 | Votes: 0 | Rating: 0 ]

What is System Fusion - System Fusion is a digital communications mode for voice and data, including pictures. It utilizes a customized, yet open, C4FM FDMA standard. An introduction to Yaesu System Fusion by Wireless Society of Southern Maine
[ Hits: 109 | Votes: 0 | Rating: 0 ]

50 MHz F2 Propagation Mechanisms - In order to understand, however imperfectly, when the band will open, it is essential to have some understanding of why the band will open. Article by J. R. Kennedy K6MIO/KH6, Gemini Observatory Hilo, Hawaii
[ Hits: 111 | Votes: 1 | Rating: 8 ]

Icom IC-R7100 Clicking Noise - How to solve the problems with the ICOM IC R7100 receiver that every time the squelch opens or closes, it produces a clicking noise.
[ Hits: 158 | Votes: 0 | Rating: 0 ]

Using the Baofeng UV-5R3 - Notes for new hams using the Baofeng UV-5R3, Basic Ham Procedures, open repeaters, Local Ham Nets.
[ Hits: 109 | Votes: 1 | Rating: 10 ]

KiCad EDA - A Cross Platform and Open Source Electronics Design Automation Suite that runs on multiple operative systems. It allow to easily create even complex schematics and is suitable for professional use
[ Hits: 87 | Votes: 0 | Rating: 0 ]
TinyCAD - TinyCAD is a an open source program for drawing circuit diagrams which runs under Windows. TinyCAD is a program for drawing electrical circuit diagrams commonly known as schematic drawings. It supports standard and custom symbol libraries. It supports PCB layout programs with several netlist formats and can also produce SPICE simulation netlists.
[ Hits: 134 | Votes: 1 | Rating: 10 ]
FreePCB - FreePCB is a free, open-source PCB editor for Microsoft Windows, released under the GNU General Public License. It was designed to be easy to learn and easy to use, yet capable of professional-quality work.
[ Hits: 155 | Votes: 1 | Rating: 5 ]

Linux and Amateur Radio - Presentation - A PDF presentation about Amateur Radio and Linux by By: Dave Mamanakis. A beginners guide to Linux for radio amateurs, this presentation cover basic concepts of the open source operative system, from the basic installation to the setup of ham radio programs.
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OpenRepeater for Raspberry Pi - OpenRepeater is a low cost, low power, but feature rich duplex repeater controller suitable for setting up a temporary / emergency repeater systems with radios that can be run on portable power. Download the latest OpenRepeater software for your Raspberry Pi 2/3/3B+/4. This image contains everything you need to get up and running quickly.
[ Hits: 383 | Votes: 0 | Rating: 0 ]

Free ham radio utilities written in LabVIEW - Free ham radio utilities written in LabVIEW includes Open Wire Calculator, Dipole Peak/Null Angle Calculator, a Coil-Shortened Antenna Calculator ad interesting Round Coil Inductance Calculator and a Skyloop Antenna Calculator
[ Hits: 294 | Votes: 2 | Rating: 5.5 ]

com0com Null-modem emulator - The Null-modem emulator is an open source kernel-mode virtual serial port driver for Windows, available freely under GPL license.Allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.
[ Hits: 635 | Votes: 1 | Rating: 5 ]

K3NG Arduino CW Keyer - The K3NG Keyer is an open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, rivaling commercial keyers which often cost significantly more.
[ Hits: 212 | Votes: 0 | Rating: 0 ]

How to program Motorola APX P25 - How to program Motorola APX Series P25 Two-Way Radios for use with the OpenSPOT 2. This document covers some important steps to be followed to upload the correct codeplug to mMtorola P25 radios
[ Hits: 270 | Votes: 2 | Rating: 5.5 ]

HamVoip - Asterisk Allstar on the Raspberry Pi - Reference site of the HAMVOIP AllstarLink AllstarLink provides hams with a means of connecting radios, repeaters or simplex links, over the internet. It is built upon the asterisk open source PBX and runs on Linux
[ Hits: 242 | Votes: 0 | Rating: 0 ]

Hermes-Lite Low Cost HF SDR - The Hermes-Lite is a low-cost direct down/up conversion software defined amateur radio HF transceiver based on a broadband modem chip and the Hermes SDR project. It is entirely open source and open hardware, including the tools used for design and fabrication files. Over 300 Hermes-Lite 2.0 units have been successfully built.
[ Hits: 519 | Votes: 0 | Rating: 0 ]