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DK7ZB- Moxons with Aluminium Tubes, plans for moxon antenna for 6 10 12 15 meters -
A super-fast PSK mode for RTTY Contesting, 100 wpm character transmission speed for contest exchanges and macro transmission versus RTTY at 60 wpm -
The document provides a detailed guide on modifying an inverted-L antenna to include the 160 meters band. This enhancement allows amateur radio operators to utilize the lower frequency effectively, which is crucial for long-distance communication, especially during the night. The inverted-L design is popular due to its compact size and ease of installation, making it suitable for various environments. By adding top band capabilities, operators can engage in DXing and contesting on 160m, expanding their operational range and opportunities. The guide includes practical tips and considerations for construction, ensuring that the antenna maintains its performance across the extended frequency range. It discusses the necessary adjustments and materials required for the modification, along with potential challenges and solutions. Whether you are a seasoned operator or a beginner, this project can enhance your station's capabilities, allowing for more versatile operations and improved signal quality on the 160m band. -
This free program displays the location of any locator on a map. It calaculates between two Maidenhead locators the distance (km and miles) azimuth longitude latitude Show the location, direction and distance as you move your mouse on a map! Graphical Locator Program, By ON6MU -
The Skeleton Slot Antenna Revisited by Bobby Brainwave, N3VGS PDF File. -
G3WZT design for a bi-polar 600W Linear Power Amplifier for the 6M band. -
Amateur Radio website with links to radio, IT and the Arts and a link to my Yahoo VHF-CW Reflector. -
A magnetic loop antenna using a 28\" bicycle rim for six meter band -
A light and portable magnetic loop antenna with improved bandwidth and performance by HB9MTN -
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conversion of low band VHF Philips FM-92E to 6 metres -
picture and dimensions of a coax loop antenna centered at 51.490 MHz -
The Middle Tennessee Amateur Radio Society is composed of Hams in Middle Tennessee who are dedicated to promoting Amateur Radio, providing public service communications, and having FUN doing so. -
Demonstrates the design principles and performance characteristics of **corner reflector antennas**, emphasizing their high gain and directional properties. It covers critical design factors such as the corner angle and the spacing between the radiating dipole and the reflector vertex. The resource explains how reducing the corner angle increases gain but lowers feed impedance, making matching more challenging. Practical angles of 90 degrees or 60 degrees are discussed, with 90 degrees offering easier impedance matching despite slightly lower gain. Details key design considerations, including reflector side length exceeding two wavelengths and reflector width greater than one wavelength for a half-wave radiator. It specifies reflector construction using wire netting, sheet metal, or parallel metal spines spaced less than 0.1 wavelength. The article provides a table with general dimensions for UHF and VHF bands, noting typical impedance values of 50 to 75 ohms and expected SWR of 1.7:1 on the lower band edge. Adjustable radiator-to-vertex spacing is highlighted as crucial for final tuning. -
Links to US local emergency service local units -
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My Version of Wes Hayward W7ZOI / Terry White K7TAU Spectrum Analyzer -
Contest, Antennas, Rotating Towers, Rotors, Guywires, CoaxHardlines, Specs and more -
A microphone preamplifier schematic for hand-helds by ON6MU -
Over 1,000 stations in approximately 60 countries were worked using this modified twin-lead folded dipole, demonstrating its effectiveness with just 4 watts on 20 meters. This design, adapted from an ARRL Handbook concept, eliminates the shorting strap found in traditional folded dipoles, simplifying construction while maintaining performance. It utilizes readily available 300-ohm TV antenna feeder ribbon, making it a cost-effective solution for radio amateurs. The antenna's robust construction allows it to handle up to 100 watts without issues, even without a **balun**. The inclusion of a variable trimmer capacitor at the stub provides flexibility for tuning across different frequencies within a band, a practical feature for operators using transceivers like the Icom 735. Formulas are provided to calculate the precise dimensions for any desired operating frequency, enabling customization for various **HF bands**. -
Fox hunting site with details of a PC based DF system -
January 1955 QST article by W5DQV about constructing a Cubical Quad antenna for 14MHz PDF File -
Mediumwave, shortwave, and amateur bands QSL cards collection -
a PREDICT client application written by Vittorio Benvenuti, I3VFJ, allows operation of an ICOM PCR 1000 receiver in a satellite communication environmenta PREDICT client application written by Vittorio Benvenuti, I3VFJ, allows operation of an ICOM PCR 1000 receiver in a satellite communication environmenta PREDICT client application written by Vittorio Benvenuti, I3VFJ, allows operation of an ICOM PCR 1000 receiver in a satellite communication environment -
Providing quality full color QSL cards for Ham Radio operators. -
An RF power Amplifier for HF bands with 3 GI-7B tubes by CT1FMS -
An affiliate of the Philippine Amateur Radio Association, Inc. -
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The webpage provides information about the Citizen Band mailbox DBO274 in Germany, with HTTP/telnet-access. It covers topics related to CB Radio, Packet and Digital emissions, and eleven meters band. -
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Ham radio resources about qrp, dx, logging, contesting, includes lots of links to FT817 resources on the web -
A homebrew dummy load is usually a combination of several parallel carbon resistors, in order to be able a final resistance of 50 Ohms. -
Over 47 full-screen maps are available within _NAOMI_ (North American Overlay Mapper), a free Windows program designed for US and Canadian amateur radio enthusiasts. This mapping suite includes 9 backgrounds such as CQ Zones, ITU Zones, and ARRL Sections, along with 16 foreground layers like Counties, Areacodes, and Grid Locators. Users can calculate distances and bearings, track real-time mouse positions with continuous Grid-Locator data, and integrate with APRS for live station tracking via the FindU database. For a global perspective, the _Global Overlay Mapper_ (GOM) provides a world map, 8 continental maps, and 29 sub-continental maps, all with 12 active layers including Country Outlines, CQ/ITU Zones, and Prefix information. Both NAOMI and GOM offer feature-locate systems to jump to positions based on prefixes, capital cities, or Grid Locators, and provide customized beam headings and distance displays. The site also features _LogView_, a post-contest log visualization tool that analyzes Cabrillo-format logs by plotting QSOs on maps, supporting over 30 major contests like CQWW and ARRL DX, and allowing comparison with published results. -
The Construction Principles for Duoband-Yagis 2m/70cm by DK7ZB -
Small, but growing, group of amateur radio enthusiasts, most of whom are within 90 miles of Atlanta, are interested in promoting the development of the branch of amateur radio known as QRP - building and operating low power transmitters, receivers and transceivers. -
This online article provides a list of individuals who hold or have held amateur radio callsigns, detailing their public recognition. The resource identifies specific callsigns such as **K1JT** (Joe Taylor, Nobel Prize in Physics), **W6OBB** (Art Bell, syndicated radio personality), and **JY1** (King Hussein of Jordan), linking them to their non-amateur achievements. It also notes operational statuses like _Silent Key_ for deceased operators and _lapsed callsign_ for inactive licenses. The article includes information on callsign changes due to vanity callsign programs and provides examples of individuals involved in specific technical areas, such as Percy L. Spencer (**W1GBE**), inventor of the microwave oven, and Jay Kolinsky (**NE2Q**), inventor of electronic sirens. It also references amateur radio involvement in _space missions_ for individuals like Owen Garriot (**W5LFL**) and Helen Sharman (**GB1MIR**). DXZone Focus: Online Article | Famous Hams | Callsign Status | Vanity Callsigns -
Ham homebrew, software, and ham info -
Article published on Practical Wireless about the W3DZZ multiband trapped dipole antenna made available by GM0ONX -
The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply by ON6MU -
Collection of different techniques to homebrew PVC yagi antennas, including elements assembling, baluns and chokes, radiator box tips and tricks by dk7zb -
Modification of the MHW 612 by Motorola for the two meter band by sv1bsx -
Notes on moxon antennas for VHF and HF bands. Main characteristics, gain and f/b ratio by DK7ZB -
How to easy connect two Pc together with a laplink cable -
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The circuit described below will substantially reduce or completely eliminate interference from almost any local source whilst leaving the wanted signal relatively unaffected, even though it may be on the same frequencey by TREVOR, G3ZYY -
This Spectrum Analyzer supposes to be a cheap and a useful device for any ham radio by Iulian Rosu, YO3DAC / VA3IUL -
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Conversion, programming, and software notes for the AWA RT85A UHF transceiver for 70cm