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2Instructables10,903Views16CommentsWorst State in the USAJoined December 25th, 2015
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  • HF Antenna Analyser With Arduino and DDS Module

    Hi, WA2SKO here... looking at the photos you published, I'm not understanding how you are obtaining VSWR data. Is there some sort of directional coupler that I'm missing? I just started playing around with a few different DDS and PLL breakout boards (ultimately planning to build a universal function generator) but a "scanning antenna analyzer" would be a MUCH more useful thing for me (considering that my one and only antenna is a 66 foot (40 meters) dipole strung across the yard (and not a very straight run). I have no idea if the antenna is any good (it works, but is it working it's best? I bet not). Please fill me in on how that circuit actually works (just the VSWR data - which I assume ends up being a variable voltage DC signal?). Thanks!

    Transmit and sweep at the same time? Don't let the FCC RDF you...

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  • rakrupski commented on MaxPower1977's instructable How to Make a Propane Forge4 months ago
    How to Make a Propane Forge

    I built a propane forge, but instead of cutting an old propane cylinder, I used a stainless steel cooking pot: https://www.amazon.com/gp/product/B000E62GRUUsing soft firebricks to make a rectangular chamber, then wrapping it in 2 layers of Kaowool makes a cube that fits perfectly in the 13 inch diameter pot. The rear of the cube is also insulated from the rear (bottom) of the pot with 4 inches of Kaowool cut into 13 inch diameter circles.Then, the propane plumbing is attached to the rear of the pot for mechanical stability and there you have it... a forge with almost no cutting required (aside from the hole for the burner and the small holes for the screws in the rear).I did later cut a rectangular hole in the lid of the pot to cover the front - but this is not really necessary.

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  • Bit banging step-by-step: Arduino control of WS2811, WS2812, and WS2812B RGB LEDs

    Awesome! You are the man! I've been trying to write a bit-banger driver for these LED's (my son wants RGB LED strips in the front of his PC that cycle all kinds of different patterns and colors) and I was having a terrible time trying to get accurate delays. I built a little ATTiny85 board with a 24 mHz. (!) crystal and still could not get accurate, short pulses.My mistake was trying to do it in C rather than ASM. Thanks so much... you've made a little slice of my life easier!

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  • rakrupski commented on danielknox's instructable LoRaWAN Gateway9 months ago
    LoRaWAN Gateway

    Your project is very nicely done. Both thumbs up!I do, however, have a few comments:(1) It may be better to change a few dimensions and avoid using the right angle adapter for the GPS antenna. Every connector and adapter adds insertion loss. The right angle adapter wastes a bit of your sensitivity.(2) The R-Pi mounting plate does not need to be laser cut. A small hand saw and about 10 minutes of careful work will yield the same thing. When I make internal mounting plates for boards (to avoid placing holes directly in the enclosure), I either use screws to attach the plate to the enclosure standoffs, or if there are no standoffs, I solvent weld the plate to the enclosure using tetrahydrofuran. For less permanency, I use double sided foam tape instead.(3) Question: The Wi-Fi antenna and...see more »Your project is very nicely done. Both thumbs up!I do, however, have a few comments:(1) It may be better to change a few dimensions and avoid using the right angle adapter for the GPS antenna. Every connector and adapter adds insertion loss. The right angle adapter wastes a bit of your sensitivity.(2) The R-Pi mounting plate does not need to be laser cut. A small hand saw and about 10 minutes of careful work will yield the same thing. When I make internal mounting plates for boards (to avoid placing holes directly in the enclosure), I either use screws to attach the plate to the enclosure standoffs, or if there are no standoffs, I solvent weld the plate to the enclosure using tetrahydrofuran. For less permanency, I use double sided foam tape instead.(3) Question: The Wi-Fi antenna and GPS antenna share the same ground plane (mounting bracket). Is it important to consider the SPACING between them?

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