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326 links - and 9 categories

Antennas : 15M
  • Build a Lightweight 15m Yagi Antenna: Simple Design for Impressive Performance  new - In this article, Steve G0UIH presents a straightforward guide for constructing a lightweight 15m 3 Element Yagi antenna with impressive performance metrics. With a focus on ease of construction and efficiency, the design boasts a nearly 8.2dbi forward gain and 30db front to back ratio. Utilizing readily available materials and a hairpin match for impedance matching, this Yagi offers broad bandwidth and simple tuning for optimal operation across the 15m band.
    [ Hits: 51 | Votes: 0 | Rating: 0 ]
Antennas : Dipole
  • Build a Simple VHF Dipole Antenna for 2 Meters: A Beginner's Guide  new - This article serves as a beginner-friendly guide to constructing a simple VHF dipole antenna for 2 meters, perfect for novices in the hobby. With an emphasis on affordability and simplicity, it explains the basics without overwhelming technical details. Recommendations for coaxial cable and mounting methods are provided, offering practical solutions for effective communication. By following these instructions, novices can build a functional antenna without breaking the bank.
    [ Hits: 106 | Votes: 1 | Rating: 7 ]
Antennas : OCF
  • Tuning OCF L-Dipoles - The behavior of a straight dipole and its L-form is examined in terms of impedance and SWR. By adjusting the feed point or bending angle, impedance variation is observed. Impedance shifts symmetrically as the feed point deviates, leading to recommendations for optimal ratios. Model simulations aid in understanding and fine-tuning, crucial for achieving a 50 Ohm match. Practical tuning guidelines ensure efficient antenna performance.
    [ Hits: 28 | Votes: 0 | Rating: 0 ]
Ham Radio : Band Plans
  • Ham Radio Frequencies - This guide explores different radio bands that hobbyists use to talk to each other worldwide. It explains how these bands work and what they're used for. From low-frequency to high-frequency bands, each has its own unique features for people who enjoy communicating through radios
    [ Hits: 72 | Votes: 0 | Rating: 0 ]
Operating Modes : Packet Radio
  • Building Your HF Packet BBS: Linux Packeteering - The guide details setting up a comprehensive HF packet BBS using linBPQ on a Raspberry Pi. Exploring linBPQ's versatility and community support, the author emphasizes its legality considerations and cross-platform accessibility. Configuration files for linBPQ, including bpq32.cfg, chatconfig.cfg, and linmail.cfg, are explained along with the systemd service setup. The linBPQ Web Management Interface and future setup for QtTermTCP are also discussed for a complete packet BBS experience.
    [ Hits: 38 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • Prevention and Suppression of RF Interference to Audio Systems  new - In this study, the author builds upon Muncy's research, demonstrating that radio-frequency current on cable shields affects audio systems through the "pin 1 problem" and shield-current-induced noise (SCIN). An enhanced equivalent circuit for ferrite chokes is proposed, addressing dimensional resonance and inductor self-resonance. Field tests confirm that chokes reduce interference across 500 kHz to 1,000 MHz. Guidelines for diagnosing and mitigating EMI from various sources are provided for product development and field installations.
    [ Hits: 42 | Votes: 0 | Rating: 0 ]

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