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257 links

Vertical bazooka antenna for the 40m - A quarter wave vertical omni-directional antenna for 7 MHz. Formulas for dimensions in feet and meters are provided. Ideal radial angle is between 35° and 45°. Velocity factor (Vf) varies based on coax type.
[ Hits: 135 | Votes: 7 | Rating: 6.85 ]

QRP Balun: A DIY Project - DIY project of a QRP Balun. Using a high permeability ferrite rod and an old B&W dipole center insulator, he constructs a choke type balun for QRP use. The balun aims to create as much inductance as possible at HF, offering a high impedance to common mode currents
[ Hits: 59 | Votes: 0 | Rating: 0 ]
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: 198 | Votes: 3 | Rating: 9.67 ]

An Overview of Beverage Receiving Antennas ^new - This article explores Beverage antennas, a type used for low-frequency radio reception. Despite the mystique, they are relatively simple wire antennas placed near the ground. Their key benefit is improved signal-to-noise ratio by rejecting unwanted signals. While lengthier antennas offer better reception, even shorter versions (around 200 feet) can improve DX reception compared to traditional antennas.
[ Hits: 19 | Votes: 0 | Rating: 0 ]

Antennas for HOAs and Apartments - This presentation applies to HF / VHF / UHF antennas and is about 14 different type of antennas suitable for indoor od apartament installations
[ Hits: 187 | Votes: 0 | Rating: 0 ]

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: 198 | Votes: 3 | Rating: 6.67 ]

Homebrew Z-Match Transmatch - For this project, I decided to try my hand at building a Z-Match tuner from scratch. This type of tuner has been around for a while. While the Z-match can take on several variations, what distinguishes it from other circuits is that it is a resonant circuit that uses a fixed inductor.
[ Hits: 132 | Votes: 0 | Rating: 0 ]

Wire Beam Antenna Types - In this article the author feature the various types of beam antenna that can ben builw using wires, like moxon, spieder and hex beam, delta loops, bird yagi
[ Hits: 153 | Votes: 2 | Rating: 6 ]

DIY Yagi Antenna - This article describes the phases for the construction of a Yagi antenna. The calculations of the parameters are made using 4NEC2 software. This type of antenna is used for transmissions and receptions of electromagnetic waves. The project shown here refers to the frequency of 433.92 MHz.
[ Hits: 108 | Votes: 4 | Rating: 3.5 ]

The United States Awards Net - Worked All States Awards type net and club. We run daily nets on 40m at 2330z
[ Hits: 81 | Votes: 0 | Rating: 0 ]

Countries with CEPT Licence - A document that includes a list of all countries implementing CEPT licence, with detailed information on licence types like standard CEPT, CEPT Novice and HAREC. A full list of frequencies, and call signs schemas to be used by foreign operators, compiled by Hans Schwarz, DK5JI
[ Hits: 177 | Votes: 3 | Rating: 9 ]

Pocher Antenne - Amateur radio antennas manufacturer. Produces HF end-fed, dipoles, and other wire antenna types, mono band and multi band antennas.
[ Hits: 118 | Votes: 1 | Rating: 2 ]

A RemoteQth Cable Adapter for Prosistel Rotator - If you are a RemoteQth server user, and own a Prosistel rotor, you will have to deal with the problem of remoting your rotor. The solution suggested by RemoteQth is to build the K3NG interface that allows you to control any types of rotor.
[ Hits: 65 | Votes: 0 | Rating: 0 ]

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: 128 | Votes: 0 | Rating: 0 ]

Conventional or Inverter Generators - Generators are broken down into three basic types: conventional gas, inverter, and diesel. What is the difference between these? Which is best? Do you even need a generator if you already have solar or other off grid energy available? Let’s sort it out.
[ Hits: 53 | Votes: 0 | Rating: 0 ]

Understanding Impacts of 75-ohm Devices in 50-ohm Systems - This article explores the implications of using 75-ohm devices, common in TV setups, within 50-ohm systems. While mismatched cables and connectors may lead to minimal consequences in receive-only setups, potential losses and reduced isolation in splitters and taps are examined. The article concludes that, for general applications, inexpensive TV-type components can offer reasonable performance with some trade-offs
[ Hits: 149 | Votes: 2 | Rating: 9.5 ]

The CW Typewriter: A Morse Code to ASCII Converter - The CW typewriter is a compact adapter board that transforms Morse code into ASCII characters using an Iambic key. It connects to a computer via USB, emulating the keyboard. The device features inputs for Iambic keying and a WPM speed potentiometer, and outputs for a key and a speaker for side tone. The device can be used with various software and online typing games for practice, offering a unique and interactive way to learn and use Morse code.
[ Hits: 120 | Votes: 0 | Rating: 0 ]