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314CommentsWinterset, Iowa
In high school took lots of math and science. Jr. College studied Electronic Engineering Technology. Air Force - Ground Radio Equipment Repairman. Since Air Force, civilian two way radio repair, have 2nd Class FCC license. Various other electronic repair activities, worked on Infolink Electrowriter, Gaming Industry as field service tech for machine manufacturer. Have rebuilt projection tv Advent Video Beam 1000A, I have 3 of them. Will attempt most any project. But will not attempt really HV... Read More »

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  • Long range, 1.8km,  Arduino to Arduino wireless communication with the HC-12.

    Another thought too is, since the manufacturers keep the items under 1 watt this HC-12 is 100 mw or .1 Watt and/or have their product(s) classified as a toy... I think they just squeak by the FCC regs.

    You can if you use a modified 2' diameter satellite dish. Remove the LNB and replace it with a bowtie antenna. The gain of the dish + the bowtie is about 38bdm which give a substantial boost. If you are doing one way data transmission use the coiled antenna on the transmitter and the dish antenna on the receive location. Overall cost is under $50 in parts.

    I just looked at the frequency allocation chart for 2016. Here is a link to the chart. https://www.ntia.doc.gov/files/ntia/publications/january_2016_spectrum_wall_chart.pdf The 433 Mhz and the 915 Mhz both are in the Amateur Radio bands. I have a commercially produced drive way alert there are 4 different units sold at Harbor Freight it works on 433 Mhz. If I am not mistaken I do believe this module can be used without any FAA or FCC violations.

    It is a conundrum, the 2016 chart shows both frequencies in the amateur or ham band frequencies, especially where you see a commercial retailer i.e. Harbor Freight, selling items that might be in violation of FCC regs. If it is in violation, why doesn't the FCC send a "cease and desist" letter to the sellers? As to 915 Mhz, nothing wrong in using that, as a characteristic of frequencies the higher in frequency the shorter the distance they can travel. Another frequency that garage door openers use is 315 mhz. Looking at an Arduino site there seems to be substantial debate: http://forum.arduino.cc/index.php?topic=246253.0 What I gather is the duration of transmission must be less than 3 minutes and in data form. Garage door openers use 315 mhz have a short range of a hun...see more »It is a conundrum, the 2016 chart shows both frequencies in the amateur or ham band frequencies, especially where you see a commercial retailer i.e. Harbor Freight, selling items that might be in violation of FCC regs. If it is in violation, why doesn't the FCC send a "cease and desist" letter to the sellers? As to 915 Mhz, nothing wrong in using that, as a characteristic of frequencies the higher in frequency the shorter the distance they can travel. Another frequency that garage door openers use is 315 mhz. Looking at an Arduino site there seems to be substantial debate: http://forum.arduino.cc/index.php?topic=246253.0 What I gather is the duration of transmission must be less than 3 minutes and in data form. Garage door openers use 315 mhz have a short range of a hundred feet at best due to transmit power with a 1 second pulse or less. I think for keeping the FCC off your back probably 915 Mhz or 315 mhz with short burst data should keep you out of trouble. As far as range goes in these cases it appears the receivers as well as the antenna would need to have really good gain profiles as well as being very directional. As to transmitting voice or video there are other frequencies set for that i.e. 2.4 Ghz or WiFi. It is difficult at best to figure out the frequency usages you almost need to be a Philadelphia lawyer to read the Part 15 regs and have any hope of understanding them.

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  • The Most Awesome-est Mid-Century-Modern Lamp Post Light Project

    Where did you purchase the LED light ? You didn't specify in the parts list. Another variation would be to use Photo-cells on the outside of the shade making the lamp solar powered. This really makes the project universal to mount any where without the need to run any wires for power.

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  • Foxtrot70 commented on thomasjarrett16's instructable The Ultimate PVC Quadcopter4 months ago
    The Ultimate PVC Quadcopter

    Hey BenC165 - Excellent suggestion here. I went to the site and saw this as well as the other variations of the electrical junction box(es). This really gives a lot of flexibility not to mention durability to any DIY project. Thanks - Foxtrot70

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  • How to Make Mini CNC 2D Plotter Using Scrap DVD Drive, L293d Motor Shield & Arduino

    It appears that the micro-tipped marker would be enough for etch resisting, I have used this type pen to touch up a board before etching. If not I think using another pen it can be disassembled, using rubber gloves and some care, remove the absorbent medium wash out the ink and reload it with the etch resisting ink. Replace the cap when not in use to prevent drying thus prolonging its life. Once done it should take right off. This would be excellent for rapid prototyping of PCBs .

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  • How To Make The Mini Metal Foundry

    I agree, if the same crucible is being used by "cwix09" is as described in the article he should be ok. BUT, in all cases... BE VERY CAREFUL !!! If in doubt STOP until you have more info and/or ALL of your questions are answered. No one takes better care of you than... YOU.

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  • How To Make The Mini Metal Foundry

    CWIX09 - I forgot to mention before the induction heater type is an electric type. You also might find this Instructible on induction heating helpful.https://www.instructables.com/id/12KW-Induction-Hea...

    Since you live in an urban area a really "clean foundry" option you might consider is an "Induction HEATER Foundry". A steel crucible can still be used as with the charcoal or propane/natural gas types, steel melts at 2500F / 1371C and Aluminum melts at 1218F / 659C. There are various Instructibles on Induction heating that can be up-scaled to the size of this charcoal unit. Also there are various videos on YouTube showing Induction melting techniques on a smaller scale for small quantities of melting gold, silver, etc. I Hope this is of use for you.

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  • Interface a rotary phone dial to an Arduino

    jayne15 - With a rotary to DTMF or Touch Tone converter if you need Operator / Attendant, you would dial 0 (zero) the circuit would convert the pulses to the appropriate tones and the system would then dial thru. The same goes for "press 1 for... or Press 2 for... " the converter circuit counts the pulses and the generates the tone desired. Here is a link to a device that does just that, this is it costs about $45. You install it under the base cover of the phone Hope this helps. http://www.oldphoneworks.com/rotatone-pulse-to-tone-converter.html

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