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AA7EE QRP DSB transceiver homebrew project

Optimizing DX chasing efforts, this software provides a refined approach to monitoring the DXCluster. It allows operators to configure specific filtering criteria, ensuring that only relevant DX spots are displayed, thereby reducing clutter and focusing attention on desired entities or bands. The application integrates alarm functionalities, notifying the user when a spot matching their predefined parameters appears on the cluster, which is particularly useful for working rare DX or specific band slots. Spot supports both macOS and Windows operating systems, offering a cross-platform solution for a broad user base. Its design emphasizes user control over the displayed information, moving beyond a simple stream of cluster data to an actionable intelligence system for DXers. This client aims to streamline the process of identifying and pursuing DX opportunities. While the software was previously a commercial product, the developer, K3NC, has retired and made registration files for DXBase 2007 available for free, along with a utility to generate registration keys for that specific version. This allows continued use of the DXBase 2007 logging software, though it's important to note the 64-bit OS compatibility modification required for generated registration files.

General purpose image display and analysis program with special features for analyzing satellite images

Iguana Villa - Aruba island vacation rental home guest house, a three bedroom private home in Malmok, Aruba.

Big picture and detailed feature of the yaesu VR-5000 receiver

Every ham needs an RF power meter. Here is a high performance unit to build at home.

How could we share the Beverage antennas on more than one station using this homemade remote antenna switch, a project by TK5EP

Communications products, communication systems products, fiber optic cables, global messaging service, gyroscope and navigation systems

An old post by John Doty about effects of noise in longwire antenna.

North american 50 Mhz beacon map by K9MU

Address and links of many broadcasting stations

A free to download and print, paper log sheet useful for portable amateur radio operations, in a PDF file.

Radio mods for GE Phoenix radios to use in APRS applications

A remote control box for the SG-237 that allow to turn on and off, check status the SGC tuner remotely by AA5TB

How to build your own beverage antenna for 80-160 meters band by K5ZD

Meimaris Communication Equipment based in Greece

High End isopole VHF & UHF antennas for Amateur, Commercial and Military applications.

This article presents a method of controlling preamps, antenna switching and polarization switching remotely without the use of control cables.

A simple RF power amplifier initially designed for 40 meter band can work on 10 15 20 40 80 meters

The KK7UQ computer to radio interface, sound card interfaces, IMD meters interface products

Telescopic antenna towers, fixed antenna towers, stacked and sigle section antenna towers, trailer towers, cargo trailers accessories

Information about pirate radios, what they are and why are considered pirates

Testing the tv reception mod for the us version. tv reception was disabled on the us version because of the possibility of it being used while driving.

Double Bazooka Antenna, a simple coax based and broad band antenna you can easily build

Adding a Panadapter to the Yaesu FT-817

Design guidelines for Op Amp audio preamplifier circuits by Mike Martell N1HFX

Specialize in servicing modern HF/VHF/UHF multimode transceivers and receivers Icom, Kenwood, Yaesu, and a few others

A lower power desktop linear with integrated 120vac power supply. This, very compact, dual 811 version will deliver about 300 watts output. Covers all bands including WARC bands.

Notes on Axial-Mode Helical Antennas in Amateur Service. Helix Basics, Modeling Issues, and Short Helical Antennas Over Perfect Ground

An interesting article by K3DAV comparing the COMET CHA250B to other HF multiband vertical antennas

List of police, fire and emergency scanner codes listed in numerical order.

Win92 - Windows-based data management for the Pro-92/2067 trunking scanner

DTMF-KIT1 board for Transceiver, board for Telephone-Line and Remote-control without a HAM Transceiver

Broadcast Tower Specialist. Offering Manufacturing, Engineering, Erection and Tower Extension Services. Self Supporting or Guyed Towers.

This 4m Slim Jim Antenna is cheap and easy to build yet it greatly out performs the more usual dipole due to its low angle of radiation. An SWR of 1:1 is obtainable across the 4m ham radio FM band with a simple adjustment.

Backpacking, boating or mountaintopping ? Invest your time and pack this novel directional gain antenna on your next expedition

A project for a home made 5 element yagi-uda antenna for 2 meters, covering 144-148 MHz band by N1BMX

Transistor and its history and lot of related infos

How to operate on 10 and 20 meters in limited space with this trapped dipole.

TX RX Systems Inc. offers a robust catalog of RF conditioning products, including **transmitter combiners**, receiver multicouplers, and various RF filters. Their extensive experience, spanning over 45 years in the RF and Land Mobile Radio (LMR) industries, underpins their specialized offerings. They provide solutions for in-building RF coverage, repeater systems, and general RF management, catering to the demanding requirements of professional radio communications. Their product line features **bidirectional amplifiers (BDAs)**, signal boosters, and cavity filters, essential components for optimizing radio system performance. The company emphasizes reliable solutions, leveraging decades of field-proven expertise in designing and manufacturing critical RF infrastructure. From duplexers to cell enhancers, TX RX Systems focuses on delivering high-quality RF components and integrated systems designed to ensure clear and consistent radio signal integrity across diverse operational environments.

Details Guglielmo Marconi's foundational contributions to radio communication, highlighting his 1898 Patent **7777** which introduced tuning circuits for independent simultaneous communications. Chronicles the historic transatlantic reception of the Morse code letter 'S' on December 12, 1901, from Poldhu, Cornwall, to St. John's, Newfoundland, a distance of over _3,500 kilometers_. The exhibit showcases early Marconi 10-inch spark transmitters, identical to those used on the _Titanic_, alongside Canadian Marconi crystal detector models. It also features high-end commercial receivers like the IP501, weighing **87 pounds** and originally priced at $595.00, demonstrating the robust construction and technological advancements of the era.

St. Louis County Police Dispatch

The UK amateur radio licensing scheme features three distinct tiers: Foundation, Intermediate, and Full, each granting specific operating privileges. For instance, the **Foundation Licence** permits a maximum of 10 watts output power on most allocated bands, with restricted band access. The Intermediate Licence allows up to 50 watts, while the **Full Licence** grants access to the maximum UK legal power limits and all available amateur radio band allocations. UK call sign prefixes and formats provide insights into the licensee's class and the approximate issuance date. For example, M3, M6, and M7 prefixes with three letters denote Foundation Licences issued from 2002, 2008, and 2018 respectively. Intermediate Licences, often starting with "2E0" or "2E1" followed by three letters, were issued from 1991 onwards. Full Licences encompass a broader range of prefixes like G2, G3, G4, G0, and M0, with varying letter counts indicating different historical license classes and issuance periods, such as G3 plus three letters issued between 1946 and 1971. Special prefixes like GB are reserved for repeaters, beacons, data mailboxes, and special event stations, with specific numerical sequences (e.g., GB3 for repeaters, GB7 for data repeaters/mailboxes) indicating their function. Optional prefixes such as GC, GD, GI, GM, and GW denote specific UK countries (e.g., Wales, Isle of Man, Northern Ireland, Scotland, England) and can also signify club stations.

Statistics based on FCC Database. Data is compared to previous perions.

An emergency service provided to the city of Mountain View, California and the surrounding communities in time of need.

Universal radio IC-V8000 page includes accessories and photos

How test a Balun quality by W8JI

Pictures taken during lifting of a Rohn antnena tower

Audio and waterfall images of some sounds found on the RF spectrum

Frequencies, links for scanners, email lists, online audio and more for Maryland, DC, and parts of Delaware and Virginia