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Antennas : 2M- Squarooka Antenna - squared bazooka for 2 meters band
- Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel.
In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
[ Hits: 356 | Votes: 0 | Rating: 0 ]
- Wire Antenna Calculator
- A javascript online calculator for popular wire antennas, from the standard easy to build flat-top dipole, to the inverted V dipole, but also the Quad Loop, and the equilateral delta loop antenna
[ Hits: 1389 | Votes: 14 | Rating: 7.75 ]
- Folded dipole antennas: terminated vs un-terminated
- As the name suggests, it is simply a dipole with the tips folded towards each other. In this case, a full-wave dipole. The span of a standard folded dipole is aprox 0,5 lambda. In this article the author investigate on differences between un-terminated vs terminated folded dipole antennas.
[ Hits: 494 | Votes: 9 | Rating: 6.78 ]
- L.B. Cebik - W4RNL documents by ON5AU
- A collection of antenna projects by W4RNL L.B. Cebik collected in a single link page by ON5AU.
Includes ARRL QST, Modeling and Understanding Small Beams and books
[ Hits: 432 | Votes: 3 | Rating: 10 ]
- Ground Systems as a Factor in Antenna Efficiency
- A classic document originally presented in Proceedings of the Institute of Radio Engineers in 1937 and is, still today, the standard referenced by the FCC, text books and many amateur radio publications.
[ Hits: 399 | Votes: 1 | Rating: 1 ]
- Supporting Dyslexic and ADHD License Candidates
- Getting a licence with Dyslexia/ADHD can be frustating expecially after several and repeated fails. This article help understanding and helping candidates with cognitive disorders.
[ Hits: 162 | Votes: 3 | Rating: 10 ]
- Data Sound Samples
- This page contains links to a variety of data signals that have been specially recorded. Each file contains a standard test message (the quick brown fox jumped over the lazy dog) repeated twice. The files can help you learn the characteristic sound of various data modes but they can also be used to make sure your decoder is working.
[ Hits: 250 | Votes: 0 | Rating: 0 ]
- HackRF
- open source hardware for software-defined radio. HackRF One is an open source hardware platform that can be used as a USB peripheral or programmed for stand-alone operation. 1 MHz to 6 GHz operating frequency
[ Hits: 177 | Votes: 3 | Rating: 7.67 ]
- KF7P Metalwerks
- Metal products manufacturer for Grounding, cable management, surge arrestors, tower accessories, Coax standoff arms for telescoping towers, Safety stand tower platform, Mast steps, tower installation tools
[ Hits: 353 | Votes: 3 | Rating: 6.67 ]
- Seiuchy On-line morse code trainer
- Seiuchy is a web based morse code trainer that can be used even offline once the page is loaded.
Trainer can be configured to send call signs only or just part of a standard QSO, and a full QSO too. Answers are then compared and displayed and a score get calculated.
[ Hits: 244 | Votes: 2 | Rating: 9.5 ]
- F5RDS remote station setup
- An example of a remote station setup. Author give a few hints and tricks on how to setup a remote amateur radio station using standard commercial equipment and a Kenwood TS-480SAT
[ Hits: 213 | Votes: 0 | Rating: 0 ]
- QO-100 Basic Information
- Getting started on receiving the QO-100 satellite using standard satellite LNBs and a 60cm dish
[ Hits: 219 | Votes: 0 | Rating: 0 ]
- Yaesu FT-450D Review
- Yaesu FT-450D HF / 6 Meter DSP Transceiver, a nice affordable transceiver for amateur radio use, but understand the caveats.
[ Hits: 228 | Votes: 1 | Rating: 9 ]
- Challenger DX Antenna Review by NK7Z
- A review of the GAP Challenger DX Antenna that is not a traditional 1/4 wave vertical, but is a vertical dipole, this gives it several advantages over a standard 1/4 wave vertical, mainly the reduced number of radials, with excellent performances.
[ Hits: 221 | Votes: 2 | Rating: 10 ]
- W9GF GAP TITAN DX Antenna Installation
- An unusual Titan DX antenna seutp, done without the standard counterpoise. This document is not an official manual, but rather a personal note to record the antenna setup with the custom wire counterpoise.
[ Hits: 476 | Votes: 2 | Rating: 9 ]
- NanoVNA GitHub Repository
- Very Tiny Palmtop Vector Network Analyzer by edy555. This is the original GitHub firmware repository implementing the standard 50KHz to 300MHz model
[ Hits: 151 | Votes: 0 | Rating: 0 ]
- MiniTioune receiver project
- The MiniTioune receiver project, developed by Jean-Pierre F6DZP, consists of the home constructed MiniTiouner hardware which interfaces via a standard USB 2.0 port to a Windows PC running the MiniTioune software. It can be used to receive satellite broadcasts transmissions making it ideal for use on Q-oscar 100 Es hail-2 without any external frequency converters.
[ Hits: 197 | Votes: 0 | Rating: 0 ]
- SWR and Amateur Radio Antenna Tuners
- Undestanding and measuring SWR, Standing Wave Ratio in antenna feed lines. This article also introduce basic concepts and usage guidelines of amateur radio antenna tuners
[ Hits: 219 | Votes: 2 | Rating: 9.5 ]
- Apple MacBook interface for digital modes
- How to make a custom Line In connector for apple macbook or iMac to connect your amatur radio transceiver. A simple modification of a standard USB audio interface can work.
[ Hits: 135 | Votes: 0 | Rating: 0 ]
- What is SWR - standing-wave ratio
- Article about Standing-wave ratio (SWR) defined as a mathematical expression of the non-uniformity of an electromagnetic field on a transmission line. SWR is the ratio of the maximum radio-frequency (RF) voltage to the minimum RF voltage along the line.
[ Hits: 191 | Votes: 0 | Rating: 0 ]
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