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Long Waves, Short Antennas, designing antennas for MF and LF communications

A telescopic pole that you adjust to suit the band you're working on , tested on 40 20 and 15 meters band by M0PZT

GitHub reposotory of QradioPredict, a radio propagation prediction tool for VHF-UHF, based on the Irregular Terrain Model, also known as Longley-Rice. Can be used as a repeater site planing tool. Has an internal APRS client which can be used to display stations as a landmark.

Vhf Ufh transceivers, repeaters, Telemetry Scada Systems and accessories

Map of italy with amateur radio prefixes and grid squares

Fractal Antennas are a new generation of multiband antennas for wireless communications. Based on a new design concept, fractal technology.

United States Scanner Frequencies, Phone Numbers, and IP Addresses

Shopsolo UK operates as an online retail outlet primarily focused on _Citizen Band_ (CB) radio transceivers and associated peripherals. The inventory includes various CB radio models, mobile and base antennas, mounting hardware, and power supplies. Beyond CB, the store also stocks _PMR446_ license-free handheld radios, which operate on 446 MHz, and a selection of remote-control hobby items. While the primary emphasis is on CB radio, the product range extends to camping equipment, projectors, and audio speakers, indicating a broader consumer electronics and outdoor goods focus. The business is based in the UK, serving the local market with direct sales and online ordering, providing a resource for enthusiasts seeking specific CB radio gear or general outdoor and electronic items.

Onine Log for 9J2T DX Pedition

A page dedicated to the doble bazooka antenna with dimensions for all HF bands

Rigpix database pictures and specifications of Yaesu FT-857

Circuits, pictures and data about toroids, tubes and home made power amplifiers

Features and specifications for Yaesu FT 857D

Free PCB software is a snap to learn and use. For the first time, designing circuit boards is simple for the beginner and efficient for the professional.

An attempt to modify and try out the unusual antenna first described by Bill Petlowany, K6NO, in World Radio Magazine

CB Radio and 10 through 12 meter band radio dealer. Ranger Communications factory authorized dealer. Service 10 and 12 meter and CB radios.

Multiband and monoband HF Vertical antennas and rotatable dipoles manufacturer based in Texas USA

A small company that specializes in antennas and accessories for radio hobbyists who enjoy DXing the AM broadcast and LW bands

Based in San Diego CA, collectible radios, test equipment, tubes, antique radio parts, speakers and kits

True Ladder line and Wire antennas

SATBUSTER for Windows is especially designed for satellite visual observers and trackers. Its users, mainly amateur astronomers and radio amateurs, appreciate both the accuracy and the simple to use graphical interface.The software is aimed to hobbysts. However a growing number of plain folks are starting to use this tool to recognize and look at the International Space Station and the Space Shuttle during its missions too

John talk about Yaesu VX-3 as an interesting upgrade from VX-2, other reviews cover Kenwood TH-D7 TH-6A Icom-91A Kenwood TM-D700A Yaesu FT-817 and Icom IC-7000

An 87ft inverted L portable antenna working on 80 40 30 20 15 meters band

Ham Radio Android Apps to displays your current QTH locator on Google Maps using the GPS or WiFi / network location.

What Amateur Radio (ham radio) is. How to get started in ham radio. License requirements. Where to find instructions.

Your world-wide source for Heathkit, Drake, Collins and Dentron amplifier parts & upgrade kits

The Raspberry Pi Repeater Controller Project goal is to develop a low cost, low power, but feature rich duplex repeater controller suitable for setting up a temporary or emergency repeater systems with radios that can be run on portable power

Electronic Kits and parts

HFUnderground.com is dedicated to documenting longwave, mediumwave, and shortwave stations, including broadcasters, utility/military stations, pirate radio and spy numbers stations.

Terrasat Communications specializes in advanced RF technology for satellite communication, focusing on _Intelligent Block Up Converters_ (IBUCs) and Solid State Power Amplifiers (SSPAs). These products are engineered to enhance satellite link performance, offering features like extended frequency ranges and high power efficiency. The IBUC series, for instance, integrates a BUC with an SSPA, enabling operators to install, configure, and monitor units for both commercial and military satellite applications, ensuring reliable, high-performance connectivity worldwide. The company's offerings support various satellite bands, including C, X, Ku, and Ka, providing solutions for diverse operational requirements. Their technology is designed for robust field performance, with products like the _IBUC2_ and _IBUCG_ models demonstrating the integration of advanced diagnostics and control capabilities, which are crucial for maintaining optimal signal integrity in demanding environments. Terrasat's focus on _SSPA_ technology underscores a commitment to power efficiency and compact design.

Icom IC-706 Extended receing mod From OH6LGM

A beam fractal antenna for 20 meters band

A project for a four element cubical quad antenna for 144 MHz in portuguese

This is from a posting on the BARK PBBS Keith, WB2VUO

A multiplatform software oscilloscope and logical analyzer software that acquires data using an arduino or a parallax USB Oscilloscope

Video, how to build a 130 Watt Dummy Load for HF amateur radio

A 37.6-meter Morgain antenna design provides dual-band operation on 80 and 160 meters without traps. The antenna uses 1.5 mm² stranded copper wire with vinyl insulation, commonly found as domestic electrical wire. Tuning involves adjusting lateral jumper wires for the 80-meter band, with initial positions 30 cm from the arm ends, yielding 3635–3715 kHz resonance with SWR below 1.5:1. For 160 meters, a straight wire length of 18.80 meters per arm is critical, achieving 1840–1850 kHz resonance with SWR below 1.1:1. The Morgain antenna exhibits a 50-ohm feed-point impedance, allowing direct connection of 50-ohm coaxial cable like RG-8X, which handles approximately 500 watts. Spacers and the central plate are constructed from 1 mm thick green fiberglass laminate, with spacers measuring 11 cm and installed every 1.90 meters. The central plate is 11 × 11 cm, designed to secure the coaxial cable mechanically. End supports utilize 3–6 mm thick bakelite terminal spacers, tensioned with nylon ropes.

Amateur Radio and Commercial Radio licencing exam practice. You can visit the Technician, General or Extra license pages where you can pick and choose the topics to practice so you can build up to a complete exam.

TS-850S typical faults and solutions

Amateur Prefix Maps by UT0UM updated with ARRL DXCC and ITU changes, available for download in PDF

The half wave dipole antenna is a simple and practical antenna model that consists of a half wavelength long centre fed conductor.

East Cost, deliver kenwood amateur radio parts

Sales CB Radios and accessories online

Cruise Ship and Maritime Monitoring Frequencies - cruise ship frequencies maritime scanning radios vhf uhf

Antenna adaprter mods fot the Kenwood TH-F6A or TH-F7

An introduction to antennad including a DIY assembly instruction for a A Ground Plane Antenna for NOAA Weather Stations

Yagi Calculator is a free Windows program that also runs well on Linux, Ubuntu 8.10 under Wine, to produce dimensions for a DL6WU style long Yagi antenna. Long yagis are commonly used from the 144MHz amateur band to the 2.4GHz band.

A 40-meter antenna that provides good local and regional coverage during the day and good DX capability at night

VQLog 3.1 - 782 is a shareware logbook program designed for Windows operating systems (95, 98, NT, 2000, ME, XP, Vista, 7, 10, or later), supporting resolutions of 800x600 or higher. It can also operate on macOS and Linux via virtualization software like Virtual PC for MAC, Oracle VirtualBox, or VMware. The software facilitates QSO access by date, callsign, prefix, square, DXCC, and other parameters, offering robust import capabilities for ADIF, Cabrillo, and ASCII files from various contest and logbook programs. Key features include comprehensive award tracking for DXCC, WAZ, WAC, WPX, WAS, IOTA, TPEA, DIE, VUCC, 100EACW, and up to 30 user-defined awards. It generates customizable summaries and graphical statistics for QSO activity, DX contests, Most Wanted Squares (MWS), propagation openings, and prefixes. VQLog supports DX-Spot reception and processing from DX-Cluster and PSK-Reporter with programmable warnings, integrates with callbook services like QRZ.COM and Buckmaster's CD, and offers online lookup. Electronic QSL and log upload support extends to LoTW, eQSL.cc, Clublog, and DXMAPS, with real-time updates for online logs. The program provides extended QSO information for VHF-DXers, including separate TX/RX frequencies, start/end times, propagation modes, and specific entry fields for MS, EME, and Tropo. CAT support for rig control and interfaces with ARSWIN and PstRotator for azimuth/elevation control are also included.

The resource provides an in-depth analysis of the W6NL 40m _Moxon Yagi_ antenna, utilizing a NEC-2 model to simulate its performance. It details the antenna's design parameters, including element lengths and spacing, and explores critical operational aspects such as feedpoint impedance, SWR across the 40-meter band, and radiation patterns. The document systematically presents the model's setup and the methodology for evaluating the antenna's behavior in different environments, including free space and over real ground. Performance data derived from the NEC-2 model illustrates the antenna's forward gain, front-to-back ratio, and beamwidth. For instance, the model predicts a free-space gain of approximately **6.5 dBi** and a front-to-back ratio exceeding **20 dB** at resonance. Comparisons are drawn between free-space performance and operation at various heights above average ground, demonstrating the impact of ground proximity on take-off angle and overall efficiency. The analysis also touches upon the antenna's bandwidth characteristics, indicating its suitability for the entire 40-meter band with acceptable SWR.