A vector network analyzer (VNA) is an instrument that can be used to measure antenna or coax parameters such as SWR, impedance and loss. It can also be used to characterize and tune filters. It is a very useful tool to have if you are […]

Installing MMDVM on an STM32F4 NUCLEO board and assembling an interface shield. In this series of posts we take a look at building a Digital Mobile Radio (DMR) repeater for amateur radio use on the 70cm band (UHF). This will be constructed using two surplus […]

In Ailunce and DMR by K0PIRFebruary 7, 2019 Talk and listen to Hams around the world at home using a small handheld radio! I just got started in DMR and have found it pretty easy and inexpensive. With an Internet connection and the Ailunce HD1 combined with the MMDVM […]

The Raspberry Pi is a small single board computer which runs a Debian Linux package called Raspbien compiled for its ARM processor. The board includes two USB ports, HDMI video and sound, Ethernet, GPIO, and an SD card slot for the operating system. It has […]

Gqrx SDR is available as binary package for the Raspberry Pi 3 running Raspbian Stretch and other ARM v6 running a Debian Stretch based OS. Please understand that Gqrx on ARM is still very experimental! It does not work as well as on a desktop […]

It has occurred to many that the board could be easily made for very little expense. However there is no official schematic for the interface board.  Maybe you are interested in messing with a Linux based repeater controller. Or are I need of a spare IRLP […]

In 2017, FT8 started to become the most popular of the various data modes. At the time of writing (Feb 2018), it appears to be the most popular for a number of reasons: It’s fairly simple to set up It’s significantly faster than the similar JT-65 It […]

The Raspberry Pi is a small single board computer which runs a Debian Linux package called Raspbien compiled for its ARM processor. The board includes two USB ports, HDMI video and sound, Ethernet, GPIO, and an SD card slot for the operating system. It has […]

Por XE1E  Enrique Rodríguez Ll. * Radiador de ½  onda Sección de acoplamiento de ¼ de onda Impedancia de 50 ohms Relación de ondas estacionarias  1.2:1 en VHF y 1.5:1 en UHF Polarización vertical Omnidireccional Ganancia unitaria Material necesario: 1.- 1.5 mts. de cable plano […]

Want to learn how to set up an amateur radio digital voice hotspot? Check out this post to learn how using mmdvm and Pi-Star setup —DSTAR, DMR, and other modes. After setting up an SD Card with the Pi-Star image, booting it up, and then hitting http://pi-star.local […]

Descripción sencilla Es una red mundial libre de repetidores de tecnología DMR, para su uso en las Bandas de Radioaficionados. Todos ellos se interconectan a través de unos servidores en Internet, que se llaman «master». Los master se interconectan entre sí en una estructura en […]

Why? [ I wrote these two introductory paragraphs in 2016, shortly after learning how to use D-STAR. I’ve been updating the rest of the article regularly as I learn more.] After weeks of intense learning and effort, I felt like I was just beginning to get […]

Introduction Pi-Star is great software for digital voice hotspots and repeaters. It can handle DMR, D-STAR, and YSF, as well as P25, NXDN, POCSAG, and some cross modes when used with a multi-mode digital voice modem that supports those modes. Andy Taylor, MW0MWZ, the main […]