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Antennas : 2M- Budget-Friendly 5-Element Quad Antenna Design
- Constructing a 5-element quad antenna, the author aimed for low cost and simplicity, resulting in an effective design with 11 dBi gain and SWR of 2:1 or better across the 2-meter band. Using wood and dowels, the antenna costs under $8 and takes less than two hours to build with basic tools.
The model predicts excellent performance, confirmed by ARRL Lab measurements. Practical field results demonstrate improved communication, even in simplex mode.
[ Hits: 117 | Votes: 1 | Rating: 7 ]
- 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 ]
- DIY EMC/RFI Mains Filter for a Clean Shack
- Utilizing snap-on ferrite cores and practical insights, the author enhances their shack's cleanliness against electromagnetic interference. With meticulous experimentation and installation, they improve noise levels across HF bands, reflecting on the effectiveness of their filter in minimizing common-mode disturbances. Updates underscore ongoing refinement and cautionary advice for optimal filtering and radio reception amid changing RF environments.
[ Hits: 153 | Votes: 1 | Rating: 10 ]
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