Search results

The project details a DIY SWR/Wattmeter designed around an _Arduino Uno_ shield, providing capabilities to measure RF power from 2 to **200 watts** and Standing Wave Ratio (SWR) for HF amateur radio bands. This construction features a compact design, integrating the measurement circuitry directly onto a custom PCB that interfaces with the Arduino Uno microcontroller. Key components include a directional coupler for sensing forward and reflected power, precision rectifiers, and analog-to-digital conversion for processing RF signals. The Arduino firmware handles calibration, calculations, and displays the results on an integrated LCD, offering real-time feedback on antenna system performance. The design prioritizes simplicity for homebrewers. Performance specifications indicate accurate readings within the **2-200W** power range, suitable for typical QRP to medium-power HF operations. The project provides schematics and a basic overview of the software logic.

Setting up the Arduino DUE to run as an SDR software defined radio

How to build a beverage antenna. How to deploy a BOG antenna for your next SWL DX-ing activity. Give it a try and follow the orientation tips for this bi-directional antenna.

This free software is useful for visualizing terrain and performing Longley-Rice path loss and coverage prediction using the Irregular Terrain Model. A Windows port of the Linux-based SPLAT by John Magliacane.

Build your own cobweb antenna followning M0MRR instructions and notes

A reversable quad antenna for 40 meters band by N4JTE

A shortened and invisible wire antenna for 7 MHz

An HF QRP CW RTX built around the Arduino open-source electronics prototyping platform

A homebrew project for a 2 meter 4 element yagi beam antenna by 2E0HTS

G0KYA slim jim antenna for 10 meters band

Get the most out of the shortwave listening hobby. Follow these steps to get started with your new radio.

A multiband end-fed antenna that cover 3.5 to 30 Mhz using a 1:64 Balun based on a FT240-43 core

A simple to build Yagi 2 element antenna for 15 or 20 meters band by 9m2mso

This blog is about utility and military monitoring in the HF/VHF/UHF range.

An home made 70 cm colinear antenna at M1KTA blog

An homebrew project for a 3 elements yagi monoband antenna for the 20 meters by 9M2MSO

PA11019 Travel loop antennas, these antennas cover 6.300 to 29.200 mHz , handle 35 Watts and have a packing size of 43 cm, ideal for fieldwork, or mobile operations.

A homebrew project for a multiband end-fed antenna made with a single FT140-43 and 50pf capacitor and 20 meters of wire.

A 144 MHz six element yagi beam antenna plan

Radio scanner frequencies for nsw

pictures of a 80 mt band EH antenna by YC5NBX

An experimental fractal Quad antenna for 10 meter band project by AG1LE

Video construction of a multiband HF trapped dipole antenna based on a variation of the classic W3DZZ design

A quarter-wave vertical antenna design for HF operation offers a practical solution for radio amateurs seeking a compact and efficient multi-band radiator. This project details the construction of a 5-band HF vertical, drawing inspiration from established commercial products such as the _DX COMMANDER_ and the MV6. The design emphasizes ease of assembly and disassembly, making it suitable for portable operations or installations with limited space. The article provides insights into various construction methods and offers practical tips for building a robust yet lightweight antenna. It highlights the benefits of a vertical configuration for DX contacts, particularly on the lower HF bands, and discusses real-world performance observations. The antenna is designed to cover multiple HF bands, providing versatility for various operating scenarios. Operators can achieve significant DX results with this type of antenna, often comparable to more complex arrays, especially when deployed with an effective ground system. The project aims to empower hams to build a capable antenna without significant financial outlay.

Simple Homebrew HAM blog from indonesia

This halo antenna was built to have an omnidirectional coverage while working in VHF contests.

Run an oscilloscope under your Android phone

A vertical half-moxon for the 7 Mhz by F6IRF

The Fan dipole antenna offer a easy to setup and efficient HF multiband antenna that does not require tuners or antenna switches, diagram by YC8PVU.

This is an attempt to build an Antenna rotator controller using Arduino Mega 2560 with a nice user interface showing the actual position of the antenna.

80 meter vertical experiment by Bob Raynor N4JTE

A complete list on Long Beach Frequencies. Long Beach Police Penal Codes, and Police 10 Codes

This project outlines the construction of a 3-element reversible quad antenna specifically designed for the 40-meter band. The materials required include pushup towers, pressure-treated posts, insulated wire, and various electrical components such as relays and a balun. The construction process is straightforward, beginning with the installation of the posts in a straight line, followed by the assembly of the antenna elements and their elevation to the desired height. The antenna's design allows for directional signal reception, making it ideal for operators looking to enhance their communication capabilities on the 40-meter band. The project includes detailed instructions on tuning the antenna for optimal performance, ensuring that operators can achieve the lowest SWR possible. Additionally, the design can be adapted for other bands by extrapolating dimensions, providing versatility for amateur radio enthusiasts. Overall, this reversible quad antenna project is suitable for both beginners and experienced operators, offering a practical solution for improving signal strength and directionality in 40-meter communications.

List of mods for the ICOM IC-7000 with many PDF Files

Antenna was designed for SO-50 satellite operation but can be used for any VHF/UHF activity. It's a mix of a Moxon Antenna and a Yagi antenna. It has gains 4 dBd on 2m and 6.5 dBd on 70cm bands and it is fed via single 50 Ohm cable.

A wire yagi antenna model, easy to build, made using inverted vee elements and requiring just one support by ve3vn

The ZS6BKW wire antenna, a variant of the G5RV, utilizes a specific 13m (42.6 ft) length of 450-ohm window line as its matching section, feeding a 28.5m (93.5 ft) flat-top element. This design aims for lower SWR on 40m, 20m, 17m, 12m, and 10m compared to a standard G5RV, often achieving SWR values below 1.5:1 on these bands without an antenna tuner. The feedpoint impedance transformation provided by the window line allows for direct connection to 50-ohm coax on multiple bands. F4FHH's experience involved constructing the ZS6BKW and evaluating its performance against an _OCF dipole_ (Off-Center Fed) on various HF frequencies. The article includes observations on SWR readings and operational effectiveness, highlighting the ZS6BKW's suitability for multi-band operation. The antenna's overall length, including the flat-top and window line, is approximately **41.5 meters** (136 feet), making it a significant wire antenna for fixed station use. Comparative analysis with the OCF dipole provided practical insights into the ZS6BKW's advantages and limitations, particularly concerning bandwidth and tuner requirements.

An home made trapped dipole antenna for 40 and 60 meters band by 2E0HTS

Remote HF - VHF - UHF radio station using TS-2000 and remoterig devices

2 element reversible verticals, small footprint, big results.

A quarter wave ground plane for 70 cm

A monoband end-fed half wave for 10m, 20m or any other HF band, includes a PDF with detailed information to build your own monoband or multiband antenna

A simple beam antenna offering good performances on 3 bands by 9m2mso

A basic drawing of a 2 meter quad antenna for 144 MHz

PD0AC blogs post about the Yaesu VX-3 handheld transceiver

This is a 200 Watt PEP step up transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP

Here you will find broadcast, pirate, and clandestine information including loggings, QSLs tips, and last-minute news

Detailed picture of a FT-857D backpack by YO3HJV

A three element wire yagi antenna for 7 MHz project plan with drawings and EZNEC model

A multi-mode QRP radio beacon built around the Arduino. This radio propagation beacon transmitter project is presented by M0XPD