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A photographic reference for wire and wireless telegraph key collectors and historians

QSL card printer based in Bethlehem, PA offer QSL Card printing, Bronze Plaque with sation ID and Printed Envelopes

How GPS works

This antenna is designed for stations having a difficult time putting a decent signal on 160M from small or CC&R d lots. It is a 24.5 ft. vertical antenna, made from three 10 ft. PVC sections bolted together, and half wavelength of antenna wire helically wound around the PVC sections.

The VU2BBB repeater, located in Matheran, Maharashtra, commenced operations in the late 1980s, a significant undertaking by the Bombay Repeater Society. This repeater facilitates VHF and UHF communications for local amateur radio operators, providing extended range and improved signal reliability across challenging terrain. Its establishment marked a key development in regional amateur radio infrastructure, offering a crucial node for local nets and general QSO traffic. The repeater's operational parameters include specific input and output frequencies within the 2-meter band, typically utilizing a standard offset. CTCSS tones are often employed to mitigate interference and ensure selective access for authorized users, a common practice for repeaters in densely populated areas. Regular maintenance and upgrades ensure _VU2BBB_ remains a reliable asset for the amateur community, supporting emergency communications and daily amateur radio activities. The _Bombay Repeater Society_ continues to oversee its operation, reflecting a sustained commitment to local ham radio services.

Des Moines Radio Amateurs' Association Central Iowa’s voice for Ham Radio

Louisville Hamfest - the first Saturday in September after Labor Day. A yearly event sponsored by the Greater Louisville Hamfest Association.

Decode DTMF from your iPhone. Hold your smartphone close to a DTMF source and this app will decode the numbers being dialled.

Un radioamateur à Djibouti Personal Blog

This resource provides a discussion group platform for amateur radio operators interested in APRS within Argentina. It facilitates technical discussions, sharing of operational experiences, and coordination among users of the Automatic Packet Reporting System in the region. The group serves as a central point for exchanging information on local digipeater networks, IGate deployments, and mobile tracking applications, covering both hardware and software aspects relevant to APRS implementation. The forum enables members to post questions, offer solutions, and disseminate news related to APRS activities specific to Argentina, fostering a community-driven approach to problem-solving and knowledge transfer. It supports the collaborative development and maintenance of the APRS infrastructure, allowing for real-time interaction on topics such as frequency usage, network topology, and integration with other amateur radio services.

Micro controllers and sensors

QSL Card Organizer, protection sleeves fit into binder to organize and display your QSL cards. QSL Card Holders.

A light and sturdy Quad for 10 and 15 meters. Basic Quad antenna design considerations. Building and assembling a dual band HF QUAD antenna, designing and joining cross-arms and boom, assembling spreader and element wire installation notes. QST article.

A portable wire antenna for the HF bands, made with a common speaker wire. In its natural form, the speaker wire acts as parallel feed line coming up to the bottom of the PVC feed point. From there, it's split into two wires, one heading out each side of the PVC tee.

The No-Nonsense Extra Class License Study Guide (for tests given between July 2016 and June 2020) This is the study guide you want if you want to pass the Extra Class exam

TheSociety of Midwest Contesters formed early in 1985 with the goal of uniting Midwest contesters into a competitive group and to further the idea of radiosporting in the Midwest.

TR-7 PIN diode test procedure

Features an immense gallery of color photos, facts, newsletters, articles and links for those interested in collecting or restoring antique radios

A very well done presentation about End-Fed Half-Wave antennas. This PDF document contains a summary of experiences in how to build custom EFHW antennas. Includes an interesting comparison table of UnUn configurations with recommended toroids, Wire size, turns and capacitors. An useful recap on common errors in building homebrew EFHW Ununs completes the document.

This amplifier uses two 60w Spectrian amplifier boards with the usual input and output hybrid coupler and combiner.

Antenna manufacturing & design, antennas for limited spaces, Home of the rugged 160 Meter sloper antenna

Chernihiv ham radio site

E4X - Palestine 2010 DXpedition web site May 28th to June 6th.

QRP CW transceiver Kit for 20 or 40 meter band, by OKA Hills Research, assembly history and description

A portable (15.5 foot diameter) NVIS loop for 3.5 to 7.3 MHz. Performs well at high and low takeoff angles, and has smaller footprint than most NVIS antennas.

The short history of the SSN Smoothed Sunspot Number at Luxorion

Schematic diagram for a high voltage power supply by W4NFR

Building an amateur station for competitive radiosport involves a number of critical steps, regardless of the band or bands you focus on. These include, but are certainly not limited to: Station layout, Equipment interconnection and switching, Inter-station interference, Antenna selection. Radio interface with the logging program, CW and voice keyer integration, Rotator control

Frequently Asked Questions - about vintage tube-type ham radio and communications equipment

An interesting rf coaxial switch project capable of handling 800-1500 W. This is a cheap home made RF coaxial switch in use by PA0FRI

A PDF Presetation from the W0DXCC Forum on how to improve the performances of the popular Yaesu FT-2000 transceiver

AFR Enterprises a leading distributor of electronic components, semicondustors, diodes, Resistors, Integrated Circuits across the USA.

Radioing Collins Radio collection

Elecraft K3 pictures, inside pictures, assembly and case.

How to build and properly wound an efficient RF choke to protect antenna controller in mobile setups

EME traffic and 144 MHz up operations

Are you organinzing a dx pedition? Some countries may require a visa before arrival. Find visa requirements here

Acom 1010 operating manual in english PDF File

Yahoo group dedicated to popular HF amplifier Alpha 9500

Fostering community spirit and recognizing contributions within amateur radio clubs often involves tangible tokens of appreciation. **Challenge coins** have emerged as a popular and effective method for achieving these goals, providing a unique way for clubs to acknowledge member participation and milestones. These custom-designed coins can reflect a club's specific identity and achievements, serving as a physical representation of membership and dedication. Clubs can utilize these coins for various purposes, including recognizing membership renewals, commemorating event participation like Field Day, or even as a fundraising mechanism to support club activities and repeater funds. The customization options extend to plating and color, allowing for different tiers of recognition, such as bronze for general membership, silver for life members, or gold for special awards presented by club officers. This flexibility makes them a versatile tool for enhancing engagement. Beyond traditional amateur radio clubs, organizations like the **Military Auxiliary Radio System (MARS)** also benefit significantly from challenge coins, reinforcing their connection to the broader military and amateur radio communities. The production process is simplified with artwork assistance, ensuring clubs can easily bring their unique designs to fruition.

The Kenwood MC60A with preamp, suffers from RF feedback, a search on the web reveals the extent of the problem. This document explain how to fix this problem.

Frazier Mt. DM04MS USA

This is a 30-watt sea level beacon intended for the coastal path between Northern and Southern California

This forum is to bring together all interested in Amateur Radio both listeners and Operator's alike from all over the world

Based in Katy Texas

The Sudbury Amateur Radio Club is an incorporated non-profit organization.

In this article the author shows the receiving loop antenna for 160 meters band installed at his QTH. Diagram and movie available. Article in in Turkish but can be translated in english

The Ultimate Control Software for the IC-7300, IC-7610, IC-7600, IC-7850, IC-7851 and Others is a control software suite that includes additional interesting features such as support for the built in Spectrum Scope, Audio monitors, Shortwave DB, CW Terminal, Clublog Spotting, Memory management, interface to Ham Radio Deluxe Logbook, DM780, n1mm+, log4om, DXLab and other. Runs on Windows OS, commercial licence.

Provides custom battery pack assembly services, focusing on portable power solutions for two-way radio applications. The company distributes batteries from numerous manufacturers, ensuring a broad selection for various radio models. This includes replacement packs for popular brands such as _Kenwood_, _Icom_, and Yaesu handheld transceivers, as well as batteries for CB radios and scanners. The core business function involves designing and building specific battery configurations to meet unique customer requirements, extending the operational life of portable radio equipment. Their offerings support a wide range of amateur radio activities requiring reliable, field-deployable power sources. Advanced Battery Systems also supplies individual cells and components, enabling radio operators to repair or rebuild existing battery packs, potentially saving costs compared to purchasing new OEM units. They emphasize durability and performance in their custom builds, aiming for **extended cycle life** and **consistent power output**.