Category: Linux
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More MMDVM hot spots
I needed to replace a broken hot spot case recently. At first, I reprinted my original ugly square ZumSpot + Nextion design from years ago. I was happy to be able to print it using ABS with my new printer. But I got to thinking how my newer design, a rechargeable ZumSpot+Nextion Hot Spot could…
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All-In-One-Cable Interface with svxLink
I recently saw a video by Hayden, VK7HH on his Ham Radio DX Youtube channel about a new “All In One Cable” (AIOC) computer <=> radio interface. I found a HackADay article about it that was very interesting as well. The AIOC is an STM32 based microcontroller that emulates a sound card and provides a…
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Raspberry Pi Pico W
Background I’ve built a few projects in the past using the Arduino platform. Arduino uses a variant of the C++ programming language which works well for microcontroller projects. I built my Ham Clock using a version of the Espressif ESP8266 from Adafruit called the “Feather HUZZAH” and became interested in this platform as well. The…
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OpenWebRX+ on AtomicPi
OpenWebRX is a software defined radio (SDR) web application that enables users to listen to analog and digital signals received by an attached SDR device through their web browser. As the name implies, it is a receive only application. I had recently acquired a great single board computer to run this on. OpenWebRX can demodulate/decode…
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SweetPotatoPi?
I’m not sure what you might want to call it, but my goal was to learn what the component parts of the very popular suite of Digital Voice applications that make up “Pi-Star” were, and how they interacted with each other. I wanted to use non-Raspberry Pi hardware since Raspberry Pi hardware is scarce and…
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Using BF888S UHF Radio w/ svxLink
Continuing my experimentation with cheap radios to create svxLink nodes, my next victim is the BaoFeng BF888S. For about $25 including tax you can acquire two BF-888s radios with accessories. These radios are incredibly cheaply made but should be suitable to use for a low power analog node. They are UHF and cover 400-470 MHz…
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Inexpensive SvxLink Node
I wanted to build the most inexpensive SvxLink “node” or “station” I could using off-the-shelf parts. I bought an inexpensive BaoFeng “S9Plus” (it says “UV-S9X3” on the side) radio on Amazon for $28. For the computer system, I used a Raspberry Pi 4 that I already had, however, I also found a Raspberry Pi B+…
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Building an svxLink station
Components Preparation Installing & Configuring svxLink pi@raspberrypi:~$ aplay -l **** List of PLAYBACK Hardware Devices ****card 0: seeed2micvoicec [seeed-2mic-voicecard], device 0: bcm2835-i2s-wm8960-hifi wm8960-hifi-0 [bcm2835-i2s-wm8960-hifi wm8960-hifi-0]Subdevices: 1/1Subdevice #0: subdevice # pi@raspberrypi:~ $ arecord -L…sysdefault:CARD=seeed2micvoicec…hw:CARD=seeed2micvoicec,DEV=0
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MultiMode Digital/Analog Repeater
Recently, I built a full duplex repeater that supports FM, Yaesu System Fusion, DMR, and D-STAR all on one frequency pair. Like many SOARA members, I use an MMDVM hot spot for digital modes. My new repeater is essentially a full duplex hot spot using a MMDVM (multi mode digital voice modem) board as the…
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SvxLink Powered Pi Zero Communicator
Summary: For about $30 US, you can have a Raspberry Pi based EchoLink/SvxLink node. All it takes is a Raspberry Pi Zero, Zero 2, 3, etc. and and Pi Audio Hat. With a little more work, you can use an inexpensive USB Audio dongle for the audio interface. I recently acquired some new Raspberry Pi…