Category: Electronics
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Repairing Maggiore R1 Repeater
The SOARA 224.100 Repeater became intermittent and stopped transmitting a few months ago. I finally made an appointment with the Laguna Beach water district to visit the site on May 28th. Once on site, I quickly determined that the repeater had no power output. Keying the repeater did engage the transmitter, but nothing was heard…
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TM-742AD no TX audio
I noticed an old TM-742AD in a friends garage recently. It had been disassembled and had a label on it that read “Defective Unit” – that piqued my interest! I brought the radio home and put it on the bench. The radio powered up but all of the memories were reset to default frequencies so…
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Tivo Power Supply Repair
I’ve got a very old Tivo, an HRI-250. Last week we had a major power outage that lasted 12 hours. When the power came back on, my Tivo did not. It had been having some over-heating problems, so I wasn’t surprised. Investigating further, I found that I was missing some of the supply voltages. The…
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Arduino KISS TNC
Mobilinkd (http://www.mobilinkd.com) is the producer of very compact and capable bluetooth enabled KISS mode TNCs that are used with APRS applications on Android, iOS, Windows, and Linux, and Mac OS. Their original prototype was built using the Arduino platform. On their website, they provide breadboard descriptions of various TNC designs including an Arduino based KISS…
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PowerPole Power Panel
SOARA has “battery box” building events every so often. The idea is that you build a portable container with a battery, cigar lighter socket, power switch, volt meters, and Anderson PowerPole connectors that you can use during an emergency. I have designed and/or printed and built several such breakout boxes. I built a Pelican case…
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Tip Organizer Tip
I’ve got way too many different Weller soldering Iron tips for my temperature controlled Weller ET and PT soldering irons. It finally occurred to me that I should create a tip organizer for them. I drew one in Sketchup and printed on my Hictop 3D printer.
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Kenwood TM-742 Backlight Repair – with LEDs!
Kenwood TM-x42 tri-band mobile radios have six 6.3 volt incandescent bulbs arranged in three pairs of two bulbs each to light up the display. Eventually the bulbs burn out and since they’re wired in series, they go out in pairs. I recently replaced the backlight bulbs in a friends TM-642 with white LEDs. I used…