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Category Archives: Uncategorized
SWR measurements of a SOTABeams Band Hopper
I am not yet a SOTA/POTA activator, though I would like to be (actually, I have one SOTA activation on 2m VHF). However, I do travel with my radio, and have brought my Kx3 on trips, along with a 20m … Continue reading
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IKEA couch spring repair
About a year ago we purchased and assembled an IKEA sectional sofa for our living space. A few months later, we notice one of the springs under one of the cushions had sprung loose. And another. By nearly a year … Continue reading
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Scout’s vigil and the beginning of the aftermath
Note: A friend asked if I’d share this FB post more widely. I refuse to make it global on FB, as it would then invite the inevitable cesspool of comments if it was shared widely. But feel free to link … Continue reading
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RFID-activated High-Current Power Supply Switch
More details forthcoming. Notes: 2N3904 transistors were replaced by ones with a much lower VCE voltage. The 220uF decoupling capacitor is critical to avoid odd slow powerup oscillations (likely due to relay inductance). Schematic at EasyEDA PDF schematic The enclosure … Continue reading
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Backslash line continuation in code comments
I spent several hours this weekend tracking down a bug that highlights something I never knew about GCC (and the Arduino IDE, which uses GCC). At first I was inclined to blame the limited Arduino IDE, but that in itself … Continue reading
Arduino Class Sunday July 24 2016
This is a reference post for the Intro Arduino class I am teaching at Decatur Makers on July 24, 2016, from 6pm-9pm. See the Decatur Makers website for cost and registration info. Getting Started with the Arduino! Low-cost user-friendly microcontrollers … Continue reading
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Tontec 480×320 touchscreen display with Raspberry Pi
Last December, I purchased a Tontec 480×320 touchscreen display for use with a Raspberry Pi. Complete with case (amazon link). I bought it along with a Raspberry Pi Model B in order to play with software-defined radio (SDR), motivated by … Continue reading
Serial communication with a Kenwood TS-570D
I am setting up an amateur radio station at my local maker space, Decatur Makers. Our transceiver is a Kenwood TS-570D. I have spent a lot of time debugging how to get serial communications working between the Kenwood and a … Continue reading
KX3 as a (good enough) antenna analyzer
So I am working on a DIY antenna analyzer/impedance meter. But I need to validate my design against a known antenna analyzer. I do not own one. But I do — my Elecraft KX3 can calculate SWR. If you know … Continue reading
I2C LCD Shield for Arduino – save wires!
The standard character-based display used on many Arduino projects are based on the Hitachi HD44780 chip. They are available quite inexpensively, as little as $2.59 on eBay shipped from China for a 16×2 display. Sizes go up to 20×4 (what … Continue reading