Category: Electronics

  • Fun with (IoT?) Displays

    Fun with (IoT?) Displays

    At one of the repeater sites there is a remotely addressable power control system. Right now we’re running on emergency generators after a fire took out the power distribution system to the mountain. I thought it might be useful to have a remote display that would reflect the site status. Towards that end, I wired…

  • Convenient Workbench Power

    Convenient Workbench Power

    The super convenient under-shelf Anderson Powerpole distribution panel that I made some time ago started to show signs of wearing out. The connectors had become loose inside the PLA. So, I designed a new version that’s similar to a standalone tabletop Powerpole distribution strip that I built recently. Instead of having flush mounted Powerpole connectors,…

  • LED S-Meter for /\/\otorola

    LED S-Meter for /\/\otorola

    I have been using Motorola CDM-750/1250/1550 radios to build digital and analog repeaters, full duplex links, and digital hotspots for some time. Quite a few of the radios I have do not have a front panel display. However, they do have a 16 pin accessory jack that has all of the usual signals including TX/RX…

  • Dire Wolf & YAAC for APRS

    Dire Wolf & YAAC for APRS

    I had an old Icom ID-880H lying around. The ID-880H has something many radios lack, a Data port! That gave me an excuse to buy another Masters Communications Radio Adapter kit! The DRA-50 is very similar to the RA-35/RA-42 interfaces that I’ve used before. The DRA series of adapters are designed to be used in…

  • K3NG Electronic Keyer

    K3NG Electronic Keyer

    Recently, someone mentioned they were looking for a code practice keyer during one of our HF nets. I have a few older keyers in my collection including a CMOS keyer that I built from a QST article back in the early 80’s or so and a Logikey K-1. I had recently built a very simplistic…

  • Malahit/N7DDC ATU-100 EXT Antenna Tuner 

    Malahit/N7DDC ATU-100 EXT Antenna Tuner 

    This is a 100 watt HF/6m Antenna Tuner kit sold through the usual consumer sites like Amazon, Ebay, and AliExpress. It was apparently designed by N7DDC. I happened to run across this tuner kit while looking for something else on Amazon. At $30 or so, it was cheap enough to take a chance on and…

  • Automatic Power Off

    Automatic Power Off

    I have used an APO-3 automatic power off unit in my vehicles for many years. I recently needed to add a second one for my rear-facing dash camera in my truck and wondered what it would take to design and build one myself. I decided to use an Arduino Nano as the microcontroller since I…

  • 3D Printed Dipole Support

    3D Printed Dipole Support

    for portable or fixed use I had some left over aluminum tubing from other antenna projects and thought it would be useful to build a 10 meter dipole out of it. I needed a way to attach the elements to a block of wood and attach the block of wood to a TV antenna mast.…

  • Code Practice Oscillator

    Code Practice Oscillator

    My Brother Dana, K6NR, needed a CW oscillator for an upcoming presentation on Morse Code. I didn’t have a code practice oscillator, but I have plenty of PARTS! So I set out to build one. I Googled for Code Practice Oscillator Schematics to get some ideas and found this design. It’s a clever project that…

  • More MMDVM hot spots

    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…