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Antennas : End-Fed : End Fed Half Wave Antenna- Comparing Mobile whip versus EF HW Vertical
- PH0NO conducted field tests comparing a mobile antenna (DX-UHV) to an end-fed half-wave wire. Results on 20m showed the end-fed wire outperforming the mobile antenna, with a significant difference in signal strength. On 40m, the end-fed wire surpassed the mobile antenna in spots and reach. While the mobile antenna is more practical, the end-fed wire offers superior performance. Further testing is planned.
[ Hits: 81 | Votes: 0 | Rating: 0 ]
- Fractal Antennas Master Course
- A course on fractals antennas theory provided by La Ecole nationale superieure de techniques avancees in France. Course is in French.
[ Hits: 67 | Votes: 0 | Rating: 0 ]
- Space-Efficient Excellence: Inverted L Multi-Band HF Antenna
- Discovering a solution for limited space, the inverted L HF antenna emerges as a stellar performer. Half the size of a dipole, it ensures optimal installation in restricted areas, maintaining superb transmission (TX) and reception (RX) characteristics. Spectrum Communications' multi-band version, featuring traps, proves even more space-friendly without compromising performance. A fiberglass pole offers sturdy support, while proper grounding, an RF choke, and occasional tuning contribute to a high-performing and reliable antenna system.
[ Hits: 187 | Votes: 0 | Rating: 0 ]
- Evolution of Car Radios: From Marconi to Motorola
- his historical account traces the development of car radios from Marconi's mobile wireless telegraph station on a steam engine vehicle in 1901 to Motorola's iconic car radio models in the 1930s. It highlights key milestones such as Alfred Grebe's radio-telephone experiments on Long Island and the introduction of Marconi-Phone 8 radios by the Daimler Company in England. The narrative explores technological advancements, including the transition from TRF to Super-Heterodyne circuitry and the integration of push-button controls. The evolution from vacuum tubes to transistors and compact discs is also documented, showcasing the continuous innovation in automotive entertainment systems.
[ Hits: 51 | Votes: 1 | Rating: 1 ]
- Enhancing Frontend Performance with Optimized Band Pass Filters
- This article explores the nuanced design challenges of Band Pass Filters (BPF) in radio receivers, balancing low insertion loss, high stop band rejection, and narrow bandwidth. The focus is on the "Series-Trap, Shunt-C" topology, resonator count impact, and meticulous layout design for superior stop band performance across various frequency bands
[ Hits: 82 | Votes: 0 | Rating: 0 ]
- An introduction to YIG Tuned Oscillators
- The YIG Tuned Oscillator (YTO) is the only direct signal source to provide multi octave tuning bandwidths in excess of 10 GHz. Common tuning ranges are from 2-10 GHz, 8-18 GHz and 10-20 GHz. YTO is are also
known for their superior phase noise and exceptional tuning linearity.
[ Hits: 35 | Votes: 0 | Rating: 0 ]
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