Category " DIY"

Jerry VE6TL at the University of Calgary Amateur Radio Club Welcome to my Arduino Ham Radio Starter Kit, a “virtual box” of ideas and motivations with one objective: More hams and their clubs engaging the local maker community as a gateway to amateur radio.  First of all, let’s think about the three waves of technical hobbies over the past century. In a technical hobby, individuals and groups...


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Icom IC-7300 HF/50 MHz Transceiver - wide band modification. 1. Check the radio to be disconnected from power supply 2. Please, use ESD discharge measures! No kidding, use ESD countermeasures both for your body and for the soldering station! 3. Use a lot of soldering flux! The diodes are very sensitive to high temperature and the solder Flux (I use GEL type) help in reducing the temperature for the areas...


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The K9AY is terminated loop. It consists of a wire loop of any convenient shape (diamond, delta, etc), hung from a single support and with a ground rod at the bottom. A 9:1 impedance-matching transformer is connected from one end of the loop to the ground and terminating resistor is connected the other end of the loop to the ground. This antenna is directional. Favoring signals are arriving from the feed...


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Weekend VHF QRP FM transceiver is an Open source project that was started by Jure, S52CQ in March 2015 when he started using DRA818 in his transceivers. He has made many variations/modifications since then and now the Weekend project is a nice project for HAM novice operator that within a weekend makes his first FM transceiver, antenna and passes his HAM novice class - all within one weekend,...


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Main functions: Six outputs to one input. Frequency range DC-72 MHz Characteristic impedance 50 ohm Power rating DC to 30 MHz 2 kW continue wave 3,5 kW PEP (SWR < 1:1.7) (tested with OM-3500) 50MHz 1 KW High quality PCB thickness 2 mm High quality PTFE SO-239 connectors. (KIT with connectors only) Disconnect output terminated by 50 ohm or short. You can use 2 pieces also for BPF switching...


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Many hams find that their HF mobiles receive more noise than they do usable signals. Common noise sources include the ignition system and alternator. Spark plug noise is propagated through ungrounded body panels and the exhaust system, which is normally suspended from rubber vibration dampers. The rubberized supports insulate the exhaust from ground, essentially creating a radiating spark antenna. To...


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The AxiDraw is a simple, modern, precise, and versatile pen plotter, capable of writing or drawing on almost any flat surface. It can write with your favorite fountain pens, permanent markers, and other writing implements to handle an endless variety of applications. Its unique design features a writing head that extends beyond the machine, making it possible to draw on objects bigger than the machine...


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Among its many tricks, the Raspberry Pi is capable of putting clock signals signal out on its GPIO pins, and that turns out to be just the thing for synthesizing RF signals in the amateur radio bands. What [Zoltan] realized, though, is that the resulting signals are pretty dirty, so he came up with a clever Pi shield for RF signal conditioning that turns a Pi into a quality low-power transmitter. [Zoltan]...


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