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Meteor scatter, gives quick view over meteor scatter and scatter events on vhf, lists email addresses of vhf radio amateurs qrv in meteor scatter

iPhone Software to practice taking your Ham Radio Exam

XLT Communications two way radio accessory manufacturer, microphones, headsets, belt clips, earpieces, radio cases

The FieldComm Association, based in Central Virginia, operates as a specialized amateur radio club with a primary interest in emergency communications. Members engage in various technical aspects of radio, including digital modes, QRP operations, and DXing. The association provides a platform for hams to develop skills in field deployment and reliable communication under challenging conditions, often leveraging modern digital protocols. This organization's activities support the practical application of amateur radio for public service, emphasizing readiness and operational proficiency. Members collaborate on projects and share knowledge, fostering expertise in areas like portable station setup and efficient data transmission. The focus on emergency communications distinguishes its operational priorities from general interest clubs, aligning its efforts with community preparedness.

A complete EmComm portable station article on eham.net by K9RFZ

Extending frequency to FT-290R for transverter use

Presents the Amateur Radio on the International Space Station (ARISS) program, a global educational initiative facilitating direct communication between students and astronauts via amateur radio. It outlines the operational framework for scheduled school contacts, detailing the technical requirements for ground stations and the typical Q&A format used during these events. The program utilizes VHF/UHF frequencies for voice and packet radio communications, enabling students to engage with crew members aboard the ISS. ARISS supports various educational objectives, promoting STEM fields through hands-on radio experience. The resource provides information on how schools can apply for contacts, the selection process, and preparation guidelines. It also covers the history of amateur radio in space, including past missions and the evolution of equipment used on the ISS. Regular updates on contact opportunities, operational status, and technical specifications for ARISS hardware are provided.

ACARS decoder app for the iPad, iPhone, and iPad Touch

Troposcatter, 50 MHz meteor scatter, ground gain for eme, radiation angle, by OZ1RH

Throughput improvement for the FT726R - Tapr PSK modem

Technical specification by Universal Radio

The function of the XPhase is based on the fact that the interfering signal, received by an auxiliary antenna, is added phase-shifted to the signal received from the main antenna. When the phase-shift is more or less 180°, the interfering signal is canceled out.

Trained amateur radio communicators under ARES, RACES and Skywarn serving Harford County, Maryland communities

CREST Communications REACT Team #4252 has been an active member of the community for almost 30 years and is one of the largest REACT Teams in the United States.

Studio 1 is a Paid windows SDR software defined radio application, supports Tmate and Tmate2 USB control consoles, for better tuning and control.

Big beam mast-to-boom hinged bracket articlel by G3BUG

How to enable a full TX coverage on the Yaesu FTDX101D the european version.

GM3MCK Central dipole insulator for inverted V dipoles

Collecting and history of CRT tubes and physics instruments

This wiki is intended to help identify radio signals through example sounds and waterfall images. Most signals are received and recorded using a software defined radio

With the bluecat interface it is possibile to connect a Yaesu FT 817 857 897 to a computer or a android smartphone without any cable or interface, using a bluetooth wireless connection

Amateur Radio organization specializing in VHF, UHF, and microwave communications.

Our goal is to provide the Highest Quality Products and Competent Technical Services at very competitive rates to the Telecommunications and Recreational Industries.

9600 Baud modification on the Kenwood TM441 by ON6MU

Examines JPS Communications' product offerings, focusing on their contributions to Radio over IP (RoIP) and Push-to-Talk over Cellular (PoC) technologies. The resource details how JPS solutions enhance Land Mobile Radio (LMR) capabilities by providing secure and cost-effective methods for communication expansion and interoperability. It highlights the company's 30-year history in developing infrastructure to make communication systems more versatile, secure, and robust, addressing critical needs in various operational environments. The content specifically outlines JPS gateways that bridge traditional radio systems with PoC solutions, facilitating seamless communication across disparate technologies. It also describes multiple approaches for expanding LMR coverage beyond conventional system limitations. The information presented underscores the practical application of these technologies in achieving communications interoperability, irrespective of the underlying systems or protocols, aiming to improve operational efficiency and safety.

Presents Eagle Stainless Tube & Fabrication as a certified distributor specializing in various tubing products essential for antenna construction and other amateur radio projects. It details their offerings, which include aluminum tubes in fractional, metric, and heavy wall specifications, alongside stainless steel bar stock in round, square, and flat profiles. The resource highlights the availability of a diameter sizing chart and direct contact options for specialists, indicating a focus on providing specific material dimensions and expert support for custom fabrication needs. The company emphasizes its role as a supplier of raw materials, crucial for hams engaged in DIY antenna builds or structural components for their shacks. Their inventory supports the precise mechanical requirements often encountered in radio frequency engineering, where material strength, weight, and corrosion resistance are critical design factors for outdoor installations. The site primarily serves as a product catalog and contact point for sourcing specialized metal tubing and bar stock, providing technical specifications and material grades relevant to robust amateur radio infrastructure.

This kind of antenna has grown in popularity over the last years because it gives you a decent performance and triband capabilities. But its 50 MHz design is far from optimal. Here you can learn how to improve its 50 MHz performance in a very easy way.

Wikipedia page about amateur radio spectrum assigned to the amateur radio service

Adapting a Wouxun/Kenwood USB cable as a Yaesu FT-817 FT-857 FT-897 CAT connection

Meetings Schedule, study groups, circulars from the radio communication division at ITU

Online store for scanners, CB radios, marine radio, two-way GMRS radio and radio related accessories

This app permit to work in DigiModes using the latest free version of HamRadio Deluxe Suite 5.24.0.38 with the new Yaesu FT-991 (which is not supported in that version of the application) using the Yaesu FT-950 model in HRD

A MacOSX antenna design and electronics/electrical tool package. It is a multipourpose application that allow antenna design and comomn calculations

Operating the _Icom IC-746_ HF/VHF transceiver often presents specific technical questions, and this resource compiles a comprehensive Frequently Asked Questions (FAQ) document in an ASCII text format. It details common inquiries and solutions related to the rig's functionality, accessories, and potential modifications. The content is structured into distinct sections addressing general information, power supplies, antennas, microphones, keyers, amplifiers, TNC integration, and optional IF filters. The FAQ provides practical guidance on topics such as configuring the internal automatic antenna tuning unit (ATU), selecting appropriate power supplies, and understanding microphone pin-outs. It also delves into advanced subjects like computer control via CI-V, wiring for PSK31 operation, and troubleshooting common issues like low S-meter readings on 2m FM or loose tuning shafts. Specific questions cover the installation of optional IF filters, comparing Inrad versus Icom filters, and optimizing filter combinations for various modes. Furthermore, the document outlines various hardware and firmware modifications, including those for increasing monitor volume, replacing LCD driver transistors, and implementing a "poor man's TCXO." It even touches upon untested modifications, such as replacing PIN diodes in the demodulator. The FAQ also lists manual errata and discrepancies, offering a robust knowledge base for IC-746 owners seeking to optimize their station or resolve operational challenges.

The Four Metres website offer a global overview graph of the four meter band plans world wide

The Japan Amateur Radio League (JARL) outlines the application process for foreign amateur radio operators seeking to establish a station in Japan. Required documentation includes a completed JARL-96-04 station information form, a signed JARL-04-09A Letter of Authorization, photocopies of the current amateur radio operator certificate, passport or Residence Card, and proof of bank transfer or PayPal payment. Applications must be submitted at least 60 days prior to the desired operation start date to the JARL International Section in Tokyo. Licensing information specifies eligibility for those with valid amateur qualifications listed in Annex 1, regardless of nationality. A portable/mobile 50W station license is recommended for nationwide operation, costing JPY 2,750. Fixed station licenses for output power exceeding 50W but not more than 200W cost JPY 5,400. Licenses are granted for the authorized stay period, up to five years, and are renewable for JPY 1,700. Operations exceeding 200W require a different procedure involving direct submission to the Ministry of Internal Affairs and Communications (MIC) and an on-site inspection. Radios without a 'Technical Standard Certification Number' require assurance by JARD, incurring a JPY 5,500 fee for the first radio and JPY 1,100 for each additional unit. Payment options include bank transfer to MUFG Bank, Ltd., Komagome Branch, or PayPal. The document also details guest operation rules, allowing validly licensed foreign amateurs to operate local stations under specific conditions, including host presence and identification with the host's callsign followed by their own.

The Rocky Mount Amateur Telecommunications Assn. is an amateur radio society based in Rocky Mount, NC.

Adding 17 meter band to Mosley TA-33M yagi antenna

RSGB World Prefix Map - Radio Amateur's Map of the World

The Indianapolis Police Scanner on Broadcastify allows users to listen to live police radio transmissions from Indianapolis. The website provides access to emergency communications and public safety broadcasts.

Ham radio activities, from satellite operations, eme communications, dxing and contesting, qsling and direction findings, are just some of ham radio exciting activities

General modifications applicable to any Elecraft K2

How to calculate range for a VHF antenna with a simple formula and how to increase VHF coverage.

Modification leaves nearly all of the existing Omni agc circuitry intact, simply add an audio detector which modifies the delay characteristics of the original system by G3IXQ

An interesting article on how build an optimal sounding communications loudspeaker capable to optimize sound reproduction at the frequency range from 150 Hz to 3 kHz.

The Dilawri Cardiovascular Institute (DCI) is a prominent Canadian organization dedicated to advancing cardiovascular health through cutting-edge research, equitable patient care, and medical innovation. It integrates 16 core centers, including specialized units like the Centre for AI, Data Science, and Imaging, and the Centre for Heart Rhythm, to bridge research findings directly into clinical practice. Their mission emphasizes providing world-class cardiac care accessible to all patients, regardless of their geographic location, by employing disruptive innovation and creative strategies to reach individuals faster. The institute focuses on a team-based approach, ensuring patients receive the correct therapy at the optimal time for long-term well-being. DCI's commitment extends to continuous growth through education, pushing boundaries beyond standard care, and fostering a respectful, inclusive environment for both staff and patients. They lead industry collaborations to shape the detection, treatment, and management of heart disease.

Investigates the legal framework surrounding **pneumatic antenna launchers** in Victoria, Australia, specifically their classification under the Firearms Act 1996. The author, VK3KBC, details how these devices, designed to discharge a projectile by compressed air, are defined as 'firearms' and subsequently categorized as **Category E Longarms**. This classification carries significant penalties for unregistered possession or use, with the author noting the lack of provisions for amateur radio operators to legally possess and use such devices for antenna deployment. The author shares personal experiences needing such devices for portable HF radio operations, contrasting them with previously legal slingshots and current alternatives like kites or bow and arrow. VK3KBC outlines efforts to advocate for legislative change, including submissions to the Wireless Institute of Australia (WIA) and the Victorian Department of Justice, proposing an amendment to Section 3(i) of the Firearms Act 1996 to include amateur radio field operations as an exempted use. The resource also reviews the original intent of the Category E firearm classification, suggesting that pneumatic antenna launchers may have been assigned this category in the absence of a more suitable alternative.

Some modifications for the Tigertronics Signalink USB sound card radio interface

PA3BHK connector adapter