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Grupo de radio emissao mensageiros da Paz

Taken from: Brief History of Amateur Radio in Calcutta-by Avinash Missra, VU2EM

A software defined receiver located in Tuscany Italy with a Windom antenna convering HF bands

The Northern California DX Foundation is a private foundation established in 1972 to assist worthwhile amateur radio and scientific projects with funding and equipment.

RadioReference page on Radio Shack Pro-97

The ARRL's End-Fed Half-Wave (EFHW) Antenna Kit is an easy-to-build four-band antenna designed for 10, 15, 20, and 40 meters. Ideal for portable operations, it includes a 49:1 impedance transformer for compatibility with most transceivers. This project, detailed with step-by-step assembly instructions, involves creating a weatherproof enclosure and impedance matching network. The kit simplifies HF operations and supports multiple configurations, making it a versatile tool for amateur radio opertors.

CQ World Wide 160-Meter Contest rules, results records and log official web site.

Electronic Products Design Inc based in North Carolina, offers you custom design of transformers, coils, and telemetry control systems.

Blog about my radio activities and homebrews

Live webcam images, still pictures and movie clips over an HF SSB channel. NBTV (Narrow Band Television) is a technique with some similarity to SSTV, and some to conventional FSTV

An introduction to NPR by Daniel Estevez. In this blog article Daniel EA4GPZ / M0HXM, introduce the new IP communication protocol over the 70 cm amateur radio band. Daniel is an experienced operator on IP on 430 MHz with CC1101 and Beaglebone black project and makes a good comparison of the two projects.

Notes on using a modified R7100 with discrimator tap

A large collection of electronic components symbols in spanis

Alcatel Amateur Radio Association

The Western Washington Amateur Television Society (WWATS) is a group of amateur radio operators in the Puget Sound area with a common interest in amateur television

A.I.R.A. is chartered by the State of Illinois as a non-for-profit corporation and has been in existence over 21 years

The Central Idaho Amateur Radio Club (CIARC) was founded in the early 1980s

marine and weather station products

Founded nearly 40 years ago at the Pie Hall, Denby Dale, a village famous since 1788 for giant pies.

Compact Digital Mode USB Interface. DigiLink Nano is a very compact digital mode Ham Radio interface to connect your rig to a computer or tablet and run virtually any digital mode like PSK31, RTTY, FT-4/FT-8/JT-9/JT-65, Olivia etc.

But it is only a couple of dB, The Effect Of Insertion Loss On Transmitted Power (dB to percentual loss) Original Information Provided by Neil McKie WA6KLA

The Michigan QRP Club is full of people who love challenges and new adventures. They experiment with everything radio and learn a lot along the way.

Clarifies the intricate process of calibrating the _Elecraft K2_ dial, addressing common user challenges and lively discussions on the Elecraft reflector. Wilhelm, W3FPR, dissects the K2's PLL synthesizer design, chosen for its low phase noise, kit-friendly duplication, and cost-effective components. The resource emphasizes the critical role of the 4000.000 kHz reference oscillator's accuracy during CAL PLL, CAL FIL, and CAL FCTR functions, noting its dependence on temperature and crystal stability for optimal performance. Explaining the K2's frequency display, the document reveals it relies on microprocessor-driven look-up tables generated by CAL PLL for VFO values and CAL FIL for BFO values. In SSB and RTTY, these combine, while CW and CWr modes also factor in the sidetone pitch. The author details inherent limitations, such as the 10 Hz increment resolution of the dial and varying PLL step sizes—from 3 Hz on 160 meters to 10 Hz on 10 meters. BFO increments range from 20 to 35 Hz, collectively limiting practical dial accuracy to within **20 Hz** with diligent effort, or **30 Hz** for a slightly less demanding task. The guide outlines a four-step calibration procedure: setting the reference oscillator, running CAL PLL, running CAL FIL, and setting all BFOs. It highlights the _N6KR Method_ as a particularly easy and accurate approach, requiring only the K2 and a known frequency source like WWV for zero-beating, eliminating the need for external test equipment.

shedberg, spinning & grinning livejournal blog

TJ2TT log online and QSL request

10-40m TY1TT dx pedition to Benin 2014

Spitfire Collinear Arrays for 160 meters band at UA2FW

Fixing a problem on the Alpha 87A amplifier by replacing a blower by WD0M

Association Nationale de Television Amateur

How to do a capacity check on your battery pack. Videos demonstrate how to test the capacity of a 4S 10Ah LiFePO4 Headway pack

When operating contest in a multi transceiver environment interferences between the 40m and 20m are guaranteed. An easy and inexpensive way to reduce interferences is to add coax stub filters

Calculate distance, bearing and more between Latitude/Longitude points. This page presents a variety of calculations for lati­tude/longi­tude points, with the formulas and code fragments for implementing them.

An online morse code trainer application that allows to select the digits and play them at the wpm speed you desire. While decoding will evaluate the results and will indicate your proficiency level

Windows log software for the popular RD contest, usually held in Australia in mid August.

Sao Tome & Principe February 2011 DXpedition S9DX

Our club has been setting the pace for Amateur Radio in Cleveland County and Shelby for over 50 years.

Presents various amateur radio topics through blog posts, detailing operational experiences and technical insights from the perspective of SV2YC. The content frequently discusses antenna projects, such as a **portable 20m/40m dipole** designed for rapid deployment, and explores the performance characteristics of different wire configurations in varied field conditions. Observations on propagation and band activity across the HF spectrum are also regularly documented, providing practical context for fellow operators. Specific entries often include detailed accounts of **DX contacts** and participation in minor contests, outlining station setup, power levels, and antenna choices. The blog also covers modifications to commercial transceivers and homebrew accessory construction, offering practical advice on improving station efficiency and functionality. Further posts delve into software applications for logging and digital modes, sharing configurations and operational tips for maximizing their utility in daily amateur radio activities.

Experiments on vertical antennas for HF bands.

VK9GMW will be operating from Mellish Reef between March 22 and April 6, 2009.

Norfolk Island 6m DXpedition 25 March to 07 April 2012 VK9N/ZL1RS

The West Virginia State Amateur Radio Council (WVSARC) operates as a central coordinating entity for amateur radio interests throughout the state. Its primary function involves fostering cooperation among various local clubs and organizations, ensuring a unified voice for the amateur radio community within West Virginia. The council addresses matters pertinent to state-level amateur radio operations, including band plans, emergency communications preparedness, and regulatory issues affecting local hams. Historically, the WVSARC has played a role in organizing statewide events and providing a platform for information exchange among its member clubs. This structure helps to streamline efforts in areas such as public service events, disaster response drills, and the promotion of amateur radio to new licensees. The council's activities contribute to the overall health and growth of the hobby by facilitating communication and resource sharing across the diverse amateur radio landscape of West Virginia.

ARI sezione di Bologna, Italy

A cavity backed antenna is a practical slot antenna tipically used in microwave applications

An independent review of the Grundig Yacht Boy 360 portable mediumwave receiver

Mad River Radio Club sponsor the Ohio QSO Party

Single operator two radios (SO2R) operating practice at wikipedia

Washington IA

Yamuna Cable Accessories Pvt. Ltd. specializes in the development, manufacturing, and marketing of power cable accessories, including a comprehensive range of cable jointing kits and components. The product line encompasses _Heat Shrink_ and _Cold Shrink_ cable joints, heat shrinkable tubing, pre-moulded slip-on joints, resin pour, and Tapex systems, all designed for applications up to 66 kV. The company highlights its ISO 9001-2015 certification, signifying adherence to international quality management standards in its manufacturing processes. The resource details specific product categories such as end caps, insulation piercing connectors, copper mesh, fireproof coatings, tubing and components, lugs and ferrules, and safety products. It also features specialized items like _Elbow Connectors_ rated for 25 kV-250, 400, and 630 amps, and various types of tinned copper braid used for grounding and electrical shielding. The site provides an overview of their manufacturing capabilities and global presence across 40+ countries. Established in 1973, Yamuna Densons has over four decades of experience in the industry, positioning itself as a significant designer, manufacturer, and supplier of insulators, tabs, and cable jointing systems in India. The company emphasizes its role as a leading exporter of these products, serving both domestic and international clients.

The YM2XBU Bilkent University Amateur Radio Club website details the club's activities and operational focus within the amateur radio community. It serves as the primary online presence for the university's ham radio enthusiasts, showcasing their involvement in various aspects of the hobby. The site provides insights into the club's station setup, operational modes, and participation in local and international amateur radio events. Club members engage in DXing, contesting, and educational initiatives, fostering practical skills in radio communication and electronics. The _YM2XBU_ club callsign is actively used for on-air operations, contributing to the global amateur radio network. Information regarding membership, meeting schedules, and contact details for _Kagan SIRDAR_ are available, facilitating engagement for students and faculty interested in amateur radio.

High Plate Voltages Reported via Telemetry on Alpha 8410 power amplifier by AE9K