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Various publications through the years have shown how the SWR measured on a shorted (or open) feed line can be used to calculate feed line attenuation

A brick, some PVC tubing and a few other common hardware store items can be transformed into an effective Quick and Dirty RF-launcher for less than $25! By Michael Atlas, N7FC

ARRL page on amateur radio exam questio pools, withdrawn questions and question pool schedule

Yaesu FT-817 and MFJ-616 speech intelligibility enhancer product review & short takes columns from QST Magazine

Description of the 80m antenna used at CN2WW in the ARRL-DX CW 2007

By Alfred T Yerger II WA2EHI, in this PDF file explain how to remote your rig via the internet by using HRD Ham Radio Deluxe and skype

ARRL Laboratory Expanded Test-Result Report ICOM IC-746 Pro

Take the mystery and mystique out of standing wave ratio. QST Article by K5DVW

Radio communication equipment installation recommendations

Over 47 full-screen maps are available within _NAOMI_ (North American Overlay Mapper), a free Windows program designed for US and Canadian amateur radio enthusiasts. This mapping suite includes 9 backgrounds such as CQ Zones, ITU Zones, and ARRL Sections, along with 16 foreground layers like Counties, Areacodes, and Grid Locators. Users can calculate distances and bearings, track real-time mouse positions with continuous Grid-Locator data, and integrate with APRS for live station tracking via the FindU database. For a global perspective, the _Global Overlay Mapper_ (GOM) provides a world map, 8 continental maps, and 29 sub-continental maps, all with 12 active layers including Country Outlines, CQ/ITU Zones, and Prefix information. Both NAOMI and GOM offer feature-locate systems to jump to positions based on prefixes, capital cities, or Grid Locators, and provide customized beam headings and distance displays. The site also features _LogView_, a post-contest log visualization tool that analyzes Cabrillo-format logs by plotting QSOs on maps, supporting over 30 major contests like CQWW and ARRL DX, and allowing comparison with published results.

ARRL affiliated organization

ARRL Lab notes, article by WB8IMY on helping choosing the best transceiver for your needs.

ARRL Audio News contains highlights taken from the League's weekly publication, The ARRL Letter. ARRL Audio News is available via internet in mp3.

"QEX is the ARRL "Forum for communications experimenters." QEX is published bimonthly, it features technical articles, columns, and other items of interest to radio amateurs and communications professionals

JT65 is a digital protocol intended for Amateur Radio communication with extremely weak signals. It was designed to optimize Earth-Moon-Earth (EME) contacts on the VHF bands, and conforms efficiently to the established standards and procedures for such QSOs.

By Jim Davey WA8NLC

Original Tuna-Tin 2 QRP CW transceiver article by W1CER

North Carolina ARRL Section Information

The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions.

The Considerate Operator's Guide shows frequencies generally recognized for certain modes or activities (all frequencies are in MHz).

PSK31 is a digital communications mode which is intended for live keyboard-to-keyboard conversations, similar to radioteletype. Its data rate is 31.25 bauds (about 50 word-per-minute), and its narrow bandwidth (approximately 60 Hz at -26 dB) reduces its susceptibility to noise.

ARRL review ICOM IC-756 pro III HF/6 meter transceiver at central michigan ARC PDF File

Using MFSK mode, 98 Kb PDF doc, taken from QST January 2001

ARRL Hamfests and conventions calendar

A 40 meter rig with SSB and CW operating modes. This is a low power QRP rig with up to 6 watts CW or PEP output.

W1AW code practice transmissions for the dates and speeds indicated. The files are in MP3 format

Building an RFD antenna, a easy to build portable aerial

ARRL article on random wire antenna, simple antennas that can be tuned for every band, excellent solution for field day operations

ARRL's Logbook of the World (LoTW) system is a repository of log records submitted by users from around the world. When both participants in a QSO submit matching QSO records to LoTW, the result is a QSL that can be used for ARRL award credit.

ARRL Laboratory Expanded Test-Result Report Kenwood TS-570D

W5PC is an ARRL Special Services Club, ARES/RACES/SKYWARN in Weatherford, Parker County, TX

A proven and practical approach to dealing with RFI from grow lights and more.

American Radio Relay League

The Amateur Radio coordinating organization for the 10 meter band and higher in northern California. In cooperation with the FCC, ARRL, and the support of the hams in northern California, NARCC performs the repeater coordination function for the region.

The _National Contest Journal_ (NCJ) serves as a dedicated resource for amateur radio contesters, providing in-depth articles, operational strategies, and technical insights. Published bimonthly by the ARRL, it covers a wide array of contesting topics, including antenna systems, station optimization, operating techniques, and rule interpretations for major events like the NA Sprint and various QSO Parties. The journal aims to enhance the competitive edge of participants across all skill levels, from casual operators to serious multi-operator teams, by sharing experiences and data from high-scoring stations. NCJ content frequently includes detailed analyses of contest results, offering breakdowns of scores, participant statistics, and comparisons of operating strategies. Readers can find practical advice on improving their contest performance, such as optimizing logging software usage or maximizing **run rates**. The journal also features columns on specific contest modes like RTTY and provides updates on rule changes and upcoming events, helping contesters prepare for future competitions and achieve better results, often leading to **top 10** finishes in their respective categories.

The Online Callbook for Internet Explorer makes it easy to find QSL information from the most popular HAM-radio web sites, such as QRZ.COM, ARRL.ORG, RAC.CA, QRZ.RU, BUCK.COM and OCTAVIA.COM,

The ARRL DXCC Challenge is a new program for all band DXers

Solving Ignition Noise RFI article. Help on removing noise interfences caused by ignition

A practical approach to microwave signal analysis for the home experimenter

An optimized QRP transceiver for 40 meters band

Nino porcino documentation about CHIP64 digital mode

Audio files to help identify rf noise (rfi). Identify the RFI that interferes with your reception. RFI Noise identification.

CLARC was founded in 1987 as an ARRL Special Services Club and is an IRS 501(c)3 not-for-profit organization serving the NASA/Clear Lake area of Houston, Texas.

North Jersey DX Association, home of the ARRL W2 Incoming QSL Bureau

The Broward Amateur Radio Club was founded in 1946 and received their ARRL Charter of Affiliation March 2, 1949 and is now one of the largest clubs in the South Florida area today.

How track and solve electrical interference from you computer

Green that aluminum into something useful right in your own backyard by WB2CQM

QST review for Yaesu FT-920

ARRL video review of the Yaesu FTDX-5000