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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: 118 | Votes: 1 | Rating: 7 ]

• Magnetic Loop Antenna Builds and Autotuning Advancements - Explore two magnetic loop antenna constructions, utilizing a 6-foot and a 12-foot square loop. Accompanied by a detailed description, the 6-foot loop features a built-in stepper motor control circuit, while the 12-foot loop incorporates a separate loop controller. Efficiency, tuning ranges, and the innovative autotuning solution using a microcontroller are discussed, offering insights into overcoming the antenna's narrowband limitations.
  [ Hits: 67 | Votes: 0 | Rating: 0 ]

• Another vertical antenna for 30, 40 and 80 meters - This article is to describe a multi band DX-dedicated antenna offering a minimum of compromises (such as lossy traps), for the hams not having any high-support
  [ Hits: 4377 | Votes: 4 | Rating: 3.5 ]
• 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 ]

• Omiss - OM International sideband society incorporated nets 75M, 40M, and 20M Nets begin one hour earlier during Daylight Savings Time
  [ Hits: 2114 | Votes: 9 | Rating: 9.68 ]

• Custom Ham Maps - The webs premier site for custom ham maps (azimuthal equidistant projection maps) and great circle bearing/distant charts for the radio amateur. Customized azimuthal equidistant projection maps and tables.
  [ Hits: 4643 | Votes: 8 | Rating: 6.87 ]

• ARDF Sprints and Fox-oring - About Amateur Radio Direction Finding events, sprint and Fox-Oring spcialities. Sprints are intended to bring ARDF nearer to the public and to attract potential sponsors and new athletes to ARDF. Foxoring encourages ARDF enthusiasts to improve their orienteering skills.
  [ Hits: 116 | Votes: 0 | Rating: 0 ]
• ARDF Equipment Ideas - RDF Equipment Ideas for VHF Foxhunting and Radio-Orienteering. This information is primarily for the Amateur Radio two-meter band
  [ Hits: 175 | Votes: 0 | Rating: 0 ]

• HF Antennas for restricted space - Arrl document about invisible antennas and indoor systems. It is important to consider that few compromise antennas are capable of delivering the performance one can expect from the full-size variety. But the patient and skillful operator can often do as well as some fellows who are equipped with high power and full-size antennas. The "cliff-dweller" may not be able to "bore a hole" in the band as often, and as easily, but DX can be worked successfully when band conditions are suitable.
  [ Hits: 9199 | Votes: 7 | Rating: 5.28 ]

• Propagation on 630 Meters and 2200 Meters - This is a theoretical look at propagation on 630-Meters and 2200-Meters using ray tracing software. It expands on the brief discussion in the ARRL Handbooks. The Earth's magnetic field affects 630-Meter and 2200-Meter band propagation. Lower ionization reduces absorption, aiding low-frequency propagation. Differences exist between bands, limited daytime sky-wave propagation. Sunrise/sunset show promise, yet mechanisms are unclear. Ducting possible at night in specific conditions. Negative ions enhance propagation. Inefficient antennas and high man-made noise are anticipated. Groundwave propagation is significant on 2200-Meters.
  [ Hits: 38 | Votes: 1 | Rating: 10 ]

• Low cost frequency stabilisation - The Icom IC-746 is quite a popular HF/VHF multimode transceiver which has one shortcoming in its standard configuration when used to operate modes requiring good medium-term frequency stability.
  [ Hits: 1724 | Votes: 1 | Rating: 5 ]

• Sams Technical Publishing - Sams continues the tradition with the publication of new manuals every month, covering the latest in Televisions, including HDTV, Projections TVs, and coming soon, LCD monitors.
  [ Hits: 994 | Votes: 0 | Rating: 0 ]

• HamAlert - HamAlert let you receive Push,SMS,Email notifications for Cluster,RBN,SOTAwatch spots, with customizable filtering based on many criteria including DXCC, SOTA and WWFF references, CQ zones
  [ Hits: 362 | Votes: 3 | Rating: 10 ]

• Omicron filter design - Electronic filter design software by omicron is the best for developing active filter, passive filter, and digital filter - check out our products and ordering information.
  [ Hits: 2776 | Votes: 3 | Rating: 5.67 ]

• HERALD P2P radio link design - Sw tool to design point-to-point multi-hop microwave links and networks, 400MHz to 58 GHz. Site/Hop Configuration; Customized Antenna & Radio Equipment Libraries; Link Budget; Path Profile Analysis ,clearance, reflections; import path profiles from SRTM maps, free download.
  [ Hits: 577 | Votes: 5 | Rating: 6.8 ]

• HamView - A freeware program to dig out weak signals buried in noise, functionally similar to the excellent FFTDSP of AF9Y, but with the added bonus of real time audio filtering of the incoming signals. Just point and click with the mouse, and the selected signal will stand out from the QRM and noise.
  [ Hits: 7563 | Votes: 3 | Rating: 5 ]