Category " DIY"

Amateur Radio Antenna Remote Disconnect for Lightning Protection from alk on Vimeo. Video by Art K4FWJ A single lightning strike can destroy thousands of dollars worth of radio equipment. Experienced amateur radio operators know the only sure protection is complete disconnection. This can be a chore, especially when multiple antennas are involved. As well, it is all-to-easy to forget to do it. This...


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Hambuilder HBR4HF (4 Band HF Transceiver) by E-bay: The packet consist of: HBR4HF board exciter + LPF + BPF + PA (assembled and tested) RTC01C (16x2 LCD display) Controller with si5351 synthesizer VFO/BFO (assembled and tested) Aluminum enclosure with heatsink and related connector (need to assembly by your self) Condenser mic with loudspeaker (need to assembly by your self) Heterodyne...


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RTC03 HF Transceiver Controller with Si5351 Freq Synthesizer VFO/BFO + Enclosure This listing is only the Controller and Enclosure, you still need to add Exciter, Power Amplifier, LPF/BPF to do communication, RTC03 is the newest version of radio transceiver controller (RTC) Jalapindai/Homebrewpartner. This RTC version used Si5351 as frequency synthesizer and used 2 of 3 output on the chips....


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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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