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By Guy, de ON6MU, At VHF, both the 1/4-wavelength monopole and the 5/8-wavelength monopole antennas are widely used. -
Home made RF power amplifier for six meter band -
A collection of extra Icons for the superb MixW programme. -
Presents the amateur radio activities and interests of Kote, operating as 4L4KW. The page features a collection of external links relevant to the ham radio community, including references to other callsigns such as 4L1BR, 4L1W, 4L4MM, and 4L/ZL1RS, indicating potential connections or shared interests within the Georgian amateur radio scene. It also lists several well-known ham radio resources like QRZ.com, DXzone.com, and Contesting.com, suggesting an active engagement with DXing and contesting. The resource includes links to major amateur radio equipment manufacturers such as Icom, Yaesu, and Kenwood, which implies an interest in modern transceivers and station setup. The mention of DX-Summit and "fixed activity on Ham bands" further reinforces a focus on making contacts and participating in on-air operations. The page serves as a digital hub for 4L4KW's ham radio presence. -
High gain, good pattern and acceptable bandwidth. These aims can be realized with a radiation-resistance of 25-35Ohms, because the 28-Ohm-feedpoint is very simple to match. -
Information on licensing abroad for radio amatuers by OH2MCN, Veikko Komppa -
glfer is a program for reception and transmission of QRSS/DFCW signals. It is composed of two main parts: the spectrogram window, where you can see the spectrum of the received signal vs. time the transmission functions, to emit cw characters at a slow but precisely controlled speed, using the QRSS (slow CW) or DFCW (Dual Frequency CW) modes -
Antenna tests on Alford 1.2 Ghz for ATV oprations in italian -
Construction Details for 50MHz-Yagis in DK7ZB-Design -
Serving Tarrant, Parker, Wise counties, and city of Fort Worth, Azle, Springtown, Boyd, Weatherford, Saginaw -
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A simple & effective antenna pre-amp for 10m. Band (28-29.7 MHz) -
Some beginners guide to monitoring aircraft communications -
Qsl Information databse updated the 1st of the month. Over 130,000 managers and direct addresses -
Based on original G2BCX design this J-Pole antenna for the six meter band is made with a homemade ribbon cable. The antenna shown in this article includes a coaxial cable choke feed to remove RF currents from flowing on the outer of the cable. -
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An Eprom Eraser with UV-Ray for 27Cxx Eprom (and similar, common in TNC) with a timer -
Huge amount of relevant information you should know before building a tower -
Official Icom comparison chart for IC 756 PRO III, IC-7600, IC-7700 and IC-7800 -
This program has been designed for packet communication with ISS (International Space Station), PCSat or 'compatible' satellites with ease... Ideal for any UI packet communication. -
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A simple TRAP-dipole project for 20 and 40m bands includes EZNec simulations -
A triband VHF Yagi antenna for 6 m, 4 m and 2 m with one feed-point by DK7ZB -
DK7ZB provides detailed construction plans for Moxon antennas utilizing tapered aluminum tubing, specifically outlining dimensions for 50 MHz, 28 MHz, 24 MHz, and 21 MHz bands. The resource emphasizes maintaining specific taper lengths for optimal performance and describes a tuning method involving symmetrical element shifts. It also addresses stacking considerations, noting that two Moxons can be stacked 1m apart with a 90° rotation to avoid severe detuning, unlike co-planar mounting. Performance figures for the 50-MHz Moxon include a gain of **4.1 dBd** and a front-to-back ratio of _30 dB_. The construction utilizes copper fittings for element connections, with a recommendation to varnish edges against corrosion. The page features images of built antennas by _DK8UH_ and VK2QO, illustrating practical implementations for the 6-meter and 10-meter bands, respectively. -
A new weak signal DX mode for Radio Amateurs, employing M-ary FSK, phase continous tones and convolutional coded FEC. -
Two types of multi-functional Home-brew 6/8Amps - 20 Ampere variable power supplies by ON6MU -
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. -
A magnetic loop antenna using a 28\" bicycle rim for six meter band -
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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 -
A super-fast PSK mode for RTTY Contesting, 100 wpm character transmission speed for contest exchanges and macro transmission versus RTTY at 60 wpm -
A light and portable magnetic loop antenna with improved bandwidth and performance by HB9MTN -
G3WZT design for a bi-polar 600W Linear Power Amplifier for the 6M band. -
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The Skeleton Slot Antenna Revisited by Bobby Brainwave, N3VGS PDF File. -
Amateur Radio website with links to radio, IT and the Arts and a link to my Yahoo VHF-CW Reflector. -
picture and dimensions of a coax loop antenna centered at 51.490 MHz -
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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. -
conversion of low band VHF Philips FM-92E to 6 metres -
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 -
My Version of Wes Hayward W7ZOI / Terry White K7TAU Spectrum Analyzer -
A microphone preamplifier schematic for hand-helds by ON6MU -
Contest, Antennas, Rotating Towers, Rotors, Guywires, CoaxHardlines, Specs and more -
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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**. -
January 1955 QST article by W5DQV about constructing a Cubical Quad antenna for 14MHz PDF File