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A dual band X-frame wire antenna made using 4 turns for response down to 3 MHz or so, and 2 turns (switched) for response up to around 18 MHz. The loop configurations are tuned using common eBay 365 pF tuning caps.

How to use AI (Artificial Intelligence) to identify Radio signals using a RTL SDR dongle and Linux (Ubuntu). This solution implement a framework using Keras and TensorFlow to learn and recognize the RF signals.

Creating a 2m Fm Repeater with a Raspberry Pi (B) and a RTL dongle.

Bring the six meters with you during your hoilidays. This article features a portable moxon antenna for 50 MHz used for sota portable operatios

This article introduces an Arduino-based QRP CW Transceiver designed for lower HF bands. The journey begins with the Wotduino, evolving from a keyer to a multi-mode beacon. The development includes a QRP transmitter and culminates in a receiver inspired by Roy Lewallen design. The transceiver, controlled through a control bus features a signal path, modulation, filtering, and adjustable frequency settings. Despite initial testing intentions, successful QSOs on 80 and 40 meters showcase its functional capabilities.

This is a Bourne Shell script that will automagically download the FCC Amateur Radio license database, parse it, and populate a MySQL database. The database can be searched using the command line and is very fast.

Amateur radio activity days dedicated to Football (Soccer) World Cup 1 June - 15 July 2018

Shortwave and Amateur Radio Log (SWLog) is a modern suite of applications that provide logging and remote control for amateur radio and shortwave, utility, and broadcast listening. SWLog has been continuously improved and expanded since it was first released in 1988. SWLog is a suite of products that provides logging, radio control, GPS synchronization, QSL management, reporting, and propagation prediction. Program schedules from HFCC, ILGRadio, AOKI, ADDX, SWSkeds, EiBi, and others are leveraged for broadcast reception. Call sign lookups and remote logbooks are integrated with ClubLog, eQSL, QRZ, Ham365, HamQTH, and LoTW. SWLog provides Android and iOS applications for logging on the go as well as web servers for logging and remote control from anywhere. SWLog works on Windows, Linux, iOS and Android

Amateur radio portable operation has a lot to offer, even if you are a shack sloth and have an awesome setup.

The adventures and stories of M0AUW in the UK

VP9KF Log Online Search Page

How to solve the problems with the ICOM IC R7100 receiver that every time the squelch opens or closes, it produces a clicking noise.

160 Meters on the 3-element 80 Meter Vertical Yagi antenna. The article details the author's experiences with setting up and troubleshooting a 160-meter vertical antenna integrated with an 80-meter Yagi system. Each spring, they remove and later reinstall the antenna for field harvesting. The author shares their mistakes and corrections, such as coil sizing and relay configuration issues, emphasizing lessons learned to help others avoid similar errors. They describe the tuning process, comparing model and real-world performance, and conclude with an antenna checkup, discussing galvanic corrosion and maintenance for optimal operation.

World Castle Award Online Log - Search for QSOs made with valid WCA activations

Western Kentucky QSO Party

A simple 6dBi Collinear Antenna for LoRa compared to the Lorank8 gateway default antenna.

aLog365 is a ham radio (amateur radio) logbook for Android and for apple iOS. Includes features for SOTA, POTA, WWFF operations, export to all popular log file formats ADIF, EDI, Cabrillo. Upload data to HRDLOg.net Ham465 and includes dx cluster spots. iOS version is compatible with iPhone, iPad, and iPod touch and provides also an up to date DX Pedition plan.

2m 70cm 23cm Low noise Amplifiers, 3 Low noise amplifiers Outdoor unit with DB6NT parts completed.

Professional Lithium-ion battery packs factory in Shenzhen China with more than 11 years experience in Battery business. Manufactured of Lithium ion and lithium polymer battery and Lithium battery packs.

MLog is a legacy freeware hamradio logging software for windows. It has been tested on Windows XP, written by hams for hams. Even if outdated can easily run on older PCs.

Optimizing the cable connections for cat control and audio input output by implementing the digirig mobile. A small audio and rig control interface, with a single USB cable supports most QRP radios requiring external audio and CAT control facilities

Niuatoputapu Island (OC-191) as A35JP/P from 17 to 22 August 2017 80m-6m/CW&SSB

Repairing an Anritsu MS2711A handheld spectrum analyzer

Schemaric diagram for a 80m, 40m, 30m, 20m EFHW Antenna Antenna Tuner. The tuner has been designed for an antenna length of 41m and the counterpoise 7.5m.

Tips and tricks on programming the Yaesu FT-991A, from software installation and connecting to the PC via the USB Port, to properly programming memories.

Author reviews the physical appearance and ergonomics, performance on common operating modes, data modes and computer operation.

Logisim is an educational tool for designing and simulating digital logic circuits. With its simple toolbar interface and simulation of circuits as you build them, it is simple enough to facilitate learning the most basic concepts related to logic circuits.

Eritrea E31A DX pedidtion online log by Clublog

This article discusses suitable first HF antenna options for amateur radio operators with limited space. It recommends an Off-Center Fed (OCF) Dipole and a Vertical Dipole, detailing the installation processes, considerations for stealth and ease of setup, and the characteristics that make them ideal for newcomers. Safety warnings and maintenance tips are provided to ensure effective and secure operation.

This blog post details the construction and usage of a 4:1 current balun, using two FT240-31 ferrite cores and 12 bifilar turns. It clarifies common misconceptions about using 4:1 baluns with G5RV antennas and ladder-line to coaxial cable connections. M0PZT emphasizes the importance of proper measurements and the limitations of internal baluns in manual antenna tuners. Detailed instructions and considerations for winding and deploying the balun are provided, along with advice on choosing suitable cores and wire for various power levels and frequency ranges.

A nice QRP, EME, satellites, VHF DX, Amateur radio blog by Lars Petersen OZ1BXM

How to setup and work SO2R with N1MM the popular free contest logging software

Build A Shortened 40 Meter Vertical antenna For POTA / SOTA Activations. A project for a portable wire antenna for 40 meters band suitable for POTA or SOTA operations.

Replacing fan to the Elecraft K3 and solving temperature issues after replacement, by changing fans with other compatible ones.

Cavity is often required at a busy site to not only prevent its receiver from being overloaded by off-frequency signals, but also be a good neighbour and prevent low-level signals from your transmitter from getting into other users receivers - not to mention the preventing of those other signal from getting back into your transmitter to generate spurious signals in its own right.

Online log for FT8WW Crozet Island DX Pedition 2022

A collection of QSL cards from and old operator, Art J. Cook, VE4KZ, who lived in Calgary Alberta, that contained some from the far north of Canada.

Modifying the ICOM IC-756 Standard (non-Pro model) for 60m takes a little work, but it is worth the effort.

This blog chronicles the development of an 80-meter vertical antenna for amateur radio operation. The author constructs a top-loaded vertical using fiberglass poles, achieving significant performance improvements over their previous end-fed wire antenna. Comparative testing using the Reverse Beacon Network and on-air contacts demonstrates 8-10 dB gain on the east coast. The project evolved to include 40-meter capability through a modified design featuring a four-wire vertical cage, loading coil, and strategic guying system. Despite challenges with signal wobble during windy conditions, the vertical consistently outperforms the end-fed wire, particularly for reaching distant stations during nighttime propagation.

This article on basic antenna theory explains why is a 5/8 wavelength vertical antenna better than a 1/4 wavelength antenna

There are many feed systems used in yagis over the years. Gamma matches are not as common as they once were. More typical are beta matches and T matches to convert the low impedance of a yagi to 50 ohm.

Amateur radio SDR Receiver and Transceiver manufacturer , makers of the Silphase R1 an innovative HF receiver with high performance real-time spectrum scope.

Homebrew a 9:1 transformer and measurement for testing purposes with a miniVNA

Saluki manufacturer of Spectrum Analyzer, Handheld Spectrum Analyzer, Signal Analyzer, Cable and antenna analyzer, Network Analyzer|RF Signal Generator, Cable Antenna Analyzer

The 80-meter Skyloop antenna, a top-performing HF antenna, excels in weak signal work, low-noise operation, and omnidirectional coverage. Ideal for fixed stations, it delivers strong performance at low power, outperforming many alternatives, including 80m half-wave end-fed antennas. Requiring significant space for deployment, it’s well-suited for NVIS and groundwave use. Though not portable, it’s cost-effective and durable, with minor maintenance needs. Tuning may require adjustments for optimal resonance. It’s a standout for base stations, though a lighter portable version could enhance its versatility.

Artic is a program dedicated to amateur radio contest log checkers, mainly in Italian offers log checking function for VHF contests like IAC in Italy and SWAC in Switzerland

Online Log of the E44CC dx pedition to palestine 2020

Learn how to set up a vertical HF antenna with 5 bands and a quarter wavelength. Discover the benefits of using this type of antenna for ham radio operators looking for a lightweight, compact, and cost-effective solution. Get insights from professional versions like the DX COMMANDER and real-world experiences from other operators. Find out about the MV6 commercial version and its excellent results. Explore different construction methods and receive tips for quick assembly and disassembly. Stay informed with the latest articles and archives on military transmissions and Morse code learning techniques.

Search S9A Log Online DXPedition 2019 Jun 6 - 2019 Jun 18 - S9 Sao Tome & Principe

Setting up a Lora APRS tracker using the ESP32 Lora32 TTGO-T T-Beam 433/470Mhz Module.