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143 links - and 2 categories

Antennas : 40M
  • 40m Wire Antennas Comparison - On the field comparison among C-Pole antenna, an EFHW vertical antenna and an Inverter V dipole antenna. Test is done using two identical WSPRLite beacons that transmit with 200mW on the WSPR frequency and analyzing spotted results.
    [ Hits: 170 | Votes: 1 | Rating: 3 ]
Antennas : Antenna Calculators
  • Corned Fed Delta Loop - Author found a ratio between the lengths of the sides of the Delta Loop that give reasonably low SWR into a 50 ohm coaxial cable almost independent of the high above ground and other surroundings. This ratio also gives good results no matter orientation. Includes an online delta loop antenna calculator.
    [ Hits: 167 | Votes: 0 | Rating: 0 ]
Antennas : Baluns
  • Baluns and Ferrites Basics - Unlock the secrets of RF signal optimization in a presentation covering Balun essentials, diverse types, SWR Analyzer checks, revealing results, Ferrite impedance measurements, and practical applications on feeders and house conductors.
    [ Hits: 196 | Votes: 3 | Rating: 9.67 ]
Antennas : End-Fed
  • Testing End Fed Long Wire Antenna - Testing a 27.2 metre end fed long wire antenna,used for SOTA activations placed as an inverted V. The author reports in this article an on the field practical result.
    [ Hits: 165 | Votes: 0 | Rating: 0 ]
  • Multiband portable wire antennas - Vertical end fed antenna used for portable operations. The antenna will work on 80 with acceptable results, it will work fine on 40m, and it will be a good deal better than a normal 1/4 wave GP on 20, 17, 15 meters.
    [ Hits: 186 | Votes: 0 | Rating: 0 ]
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 ]
Antennas : Feed Lines : Choke
  • Patented RF choke test - A reproduction test of a a binocular ferrite core and winds a total of 7 turns is a patented rf choke with an unusual winding, although this winding scheme reduces the inductance, it might result in a much larger bandwidth over which the choke has a sufficiently large impedance. The Author test this model by reproducing the choke.
    [ Hits: 105 | Votes: 0 | Rating: 0 ]
Antennas : Halo
  • Homebase 10 - The Homebase-10 is a simple to make wire halo antenna for 10m (28MHz) built using parts available from the local DIY store. The resulting antenna is very effective on 10m despite its small size and light weight. Also shown is a dual-band version for 10m and 6m.
    [ Hits: 322 | Votes: 1 | Rating: 3 ]
Antennas : Indoor
  • Ferrite Rod TX Antenna for 40m - No exotic claims are made for this antenna. Author just tried a few WSPR experiments on 40 meters and was surprised with the results. What appears below may inspire you to try something equally off-the-wall, to see what happens.
    [ Hits: 298 | Votes: 1 | Rating: 1 ]
Antennas : Moxon
  • Enhancing Performance with W8JK/MOXON Antenna Variant - F5NPV introduces a variant of the W8JK antenna design, employing the MOXON principle. With extended monopoles, it outperforms the Open-Folded W8JK, yielding a 1dbd gain improvement, enhanced performance on 30m and 10m bands, bi-directionality, and lower side attenuation. The design's focus on higher radiation impedance results in increased antenna efficiency and reduced losses. Despite these improvements, the bill of materials remains unchanged.
    [ Hits: 178 | Votes: 0 | Rating: 0 ]
Antennas : OCF
  • Homebrew an OCF Off-Center Fed Dipole Antenna - This type of antenna is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. It’s a dipole fed off center with a 4:1 balun at the offset feed point. The antenna shown covers 80, 40, 20 and 10 meters. The formula can also be used to adjust the overall length to cover more or fewer bands and the resulting overall length. 160-10m, 80-10m or 40-10 meters depending on your available space. Other bands will require a tuner.
    [ Hits: 194 | Votes: 3 | Rating: 6.67 ]
Antennas : Receiving
  • The Loop on Ground Antenna - An experimental antenna for HF reception. It consists of a single loop element mounted on the ground. It is stealthy, small, and quiet. EZ-NEC plots and on-air test results are included.
    [ Hits: 299 | Votes: 3 | Rating: 8 ]
Antennas : Satellite
  • The VHF UHF Eggbeater Antenna Revisited - A new, simple way to build the Eggbeater Antenna. This document introduces a new, simpler way to build the Eggbeater antenna. It also introduces a technically proper way to construct the Eggbeater antenna in order to achieve the best result.
    [ Hits: 524 | Votes: 4 | Rating: 6.5 ]
DX Resources : Contest : Contest Results
  • Unearthing VHF Contest Secrets: An In-Depth Analysis - In this article, authors delve into the inner workings of the IARU R1 VHF contest, the world's largest 2m contest. While activity levels are declining, the top performers consistently maintain their results. Authors explore the physical constraints of achieving higher point totals and speculate on various factors like improved technical capabilities, increased interference, and evolving station setups. It is a fascinating journey into the contest's dynamics, leaving room for intriguing speculations about its future.
    [ Hits: 69 | Votes: 2 | Rating: 10 ]
Software : Databases
  • QRZ.sh - This script queries the QRZ.com callsign database and returns the result to the command line. A XML subscription plan with QRZ.com is required for full functionality. QRZ.com callsign data query script written in Bash
    [ Hits: 57 | Votes: 0 | Rating: 0 ]
Software : Morse Code Decoders
  • Morse Code Translator and Decoder - Use this helpful tool to translate between Morse code and text. To begin, please enter words or Morse code in the Input box and press Translate. This online tool let you translate and encode Morse code into text and vice versa text into Morse code, allowing also to play with different wpm, the resulting translated code.
    [ Hits: 167 | Votes: 0 | Rating: 0 ]
Software : Utilities
  • Transmission Line Details - This utility program shows the impedance and reflection coefficient parameters (SWR, reflection coefficient magnitude Rho, or Return Loss RL in dB) at both ends of a transmission line and the details of power loss in the line. It includes built-in specifications for approximately 100 different line types. You can modify the specs to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes.
    [ Hits: 127 | Votes: 0 | Rating: 0 ]
Technical Reference : AI Ham Radio
  • AI-Powered Radio Signal Cleanup: Battling QRM in Real Time - Amateur radio enthusiast Jean-Paul Suijs discusses combating manmade noise (QRM) in radio signals using AI. Detailing experiments with phase-shifting techniques and the self-learning nature of AI, he explores AI-based audio processing apps for real-time noise cancellation during radio contests, demonstrating results on both medium wave and shortwave bands.
    [ Hits: 67 | Votes: 0 | Rating: 0 ]
Technical Reference : Batteries : Battery Charger
  • 12v Battery Charger - Well, firstly the 12 Volt source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current and voltage, which cannot result from connecting it directly to a voltage source.
    [ Hits: 80 | Votes: 1 | Rating: 10 ]
Technical Reference : Homebrew
  • PCM Kestrel HF Transceiver - This article describes an upgrade to the Kestrel transceiver, replacing its LCD display with a 0.91-inch OLED screen for improved sound quality. VFO boards from Denys VK3ZYZ were integrated, particularly a Nano VFO board. The author shares details about the setup and the resulting enhancements, along with images of the modified components. The transceiver is now optimized for various frequencies and operates at a power output of approximately 120 W pep. More information about the boards can be found on the provided website.
    [ Hits: 65 | Votes: 0 | Rating: 0 ]

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