electronic
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Antennas : Antenna Calculators- Yagi Uda Antenna Online Calculator
- A basic YAGI UDA online antenna calculator, accept as input frequency, number of elements, diameter of parasitic element and boom diameter. This online calculator will generate a basic design data including each element length and spacing.
[ Hits: 102 | Votes: 1 | Rating: 10 ]
- HB9CV Online Antenna Calculator
- Online HB9CV antenna calculator, accept as input the desired resonating frequency and provides dimensions for spacing and length of each element, including boom and radiator diameter.
[ Hits: 197 | Votes: 4 | Rating: 10 ]
- Moxon Mania - Building the Ultimate 4-Band Moxon Antenna
- The article details the design and construction of a four-band Moxon beam by a radio amateur. The beam, mounted atop a rooftop tower, aimed for gain over a dipole on 20 meters, cost under $500, and included additional bands. The design features fiberglass spreaders, four bands (20/15/10/6 meters), and a single feedpoint. The construction involved computer modeling, NEC source code, and specific dimensions. The article outlines the assembly, materials, and tuning process, including in-situ adjustments for optimal performance. Despite initial challenges, the beam improved signal strength and facilitated contacts on multiple bands, marking it as the best HF antenna the author has owned.
[ Hits: 94 | Votes: 0 | Rating: 0 ]
- Active 3-30 MHz Hula-Loop Antenna for Shortwave
- This active antenna for the shortwave band provides surprising performance, even indoors. As the name implies, the main loop is made from a Hula-Hoop with the metallic paint stripped off and a single turn of 14AWG copper wire inserted inside the hoop.
[ Hits: 155 | Votes: 1 | Rating: 10 ]
- DXR Electronics Bits
- Electronics and Technical resources from indian amateur radio ham D.Prabakaran with callsign vu3dxr
[ Hits: 55 | Votes: 5 | Rating: 8.6 ]
- Building a Robust PL519 Tube HF Amplifier
- his article explores the construction of a PL519 tube amplifier, utilizing Ulrich L. Rohde N1UL's insights. Focusing on a modest 25W continuous output, the design ensures robustness with forced air cooling. The detailed breakdown covers input matching, screen grid voltage generation, bias adjustment, anode power supply, heater power supply, and monitoring circuitry, providing valuable guidance for ham radio enthusiasts.
[ Hits: 41 | Votes: 0 | Rating: 0 ]
- How To Achieve Perfect PCB Soldering
- Surprisingly, although PCB soldering is the core process of electronics assembly, few people do know how to solder reliably
[ Hits: 147 | Votes: 1 | Rating: 1 ]
- Innovative 2m to HF Converter
- Ulrich L. Rohde N1UL conceived an outstanding 2m to HF receiving converter with specific requirements, including 144-148MHz to 28-32MHz coverage, low noise, high IP3, and a unique modular design. The design decisions emphasize modularity, absence of preselection, stability, and a passive mixer, showcasing Rohde's distinctive approach.
[ Hits: 60 | Votes: 0 | Rating: 0 ]
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