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PACTOR can be viewed as a combination of two earlier digital modes, packet radio and AMateur Teleprinting Over Radio (AMTOR). PACTOR provides improved throughput because its transmission speed adapts to the quality of the link and it uses Huffman compressed characters.

Located in North Dakota

A gathering of Amateur Radio Operators in RV's near Quartzsite Arizona.

A RF Probe circuit for the RADIO frequency experimenter to check the presence of a RF signal and also to measure its strength

Website of the Chipola Amateur Radio Club and Jackson County ARES.

This resource, a blog from the Penang Amateur Radio Club (PARC), offers insights into various aspects of amateur radio in Malaysia. One post details monitoring Automatic Terminal Information Service (ATIS) on the 2m band, providing specific frequencies like 122.750 MHz AM for Butterworth and 126.400 MHz AM for Penang, along with sample aviation weather and operational data. Another entry critiques the lengthy and costly process of obtaining an amateur radio license in Malaysia, contrasting it with the more streamlined FCC licensing system in the United States, citing a 1-year wait and RM 414 (USD 125) for 10 years in Malaysia versus 3 weeks and USD 14 for 10 years in the US. The blog also covers internal club matters, such as the 2007 Annual General Meeting (AGM) attendance and council elections, highlighting member dissatisfaction with outdated newsletters and a call for "reformasi." Additionally, it presents local phonetic alphabets in Bahasa Malaysia and Chinese, and discusses monitoring AM broadcast bands for international stations like Voice of America on 1575 kHz and Zhong Yang Ren Min Guang Bo Dian Tai on 1134 kHz, offering alternatives to local 2m repeater chatter. The author, "firstclass," shares personal observations and criticisms regarding the Malaysian ham radio landscape.

This article describes an alternative to water as the cooling liquid for amateur radio vacuum tube power amplifiers. This cooling system is designed for adequate vacuum tube cooling, reasonable cost, and very low maintenance. By K8CU

The ANAN series SDRs are based on the OpenHPSDR open source designs, these are 4th generation radios and represent the state-of-the-art in current Amateur radio SDR design.

Radio Amateur Association of Greece

World of amateur radio by VK4NM

W8NWS is the Cincinnati, Ohio chapter of Skywarn.

Popular italian amateur radio forum by ARI Fidenza include a section dedicated to swap and sell

Master the Ham Radio license exams with Ham Technician, Ham General and Ham Extra! With these free iPhone applications, you will take the test with confidence.

Trading forum for ham radio equipment and related topics

Ham radio satellites, XE1KK/B beacon on 50.023 MHz, and some other radio experiments.

The official website of the Benelux DX-Club (BDXC), a club of radio listening amateurs, founded in November 1961

Free windows software to program or reset cara ht olinca th888a and th888S th888 th10 th2100 th2uv th9 handheld VHF UHF two way radios

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

Stryker 10 Meter Amateur Radio trasceivers, antennas and accessories manufacturer

Snake River Amateur Radio Club

The ARRL Contest Results Database serves as a centralized repository for official scores and detailed breakdowns from numerous ARRL-sanctioned operating events. This resource typically features comprehensive listings of participants, their submitted logs, and final standings across different categories, modes, and bands. It allows hams to review their performance, compare results with other operators, and analyze contest trends over time, providing valuable insights into competitive amateur radio. Historically, the database has showcased the efforts of thousands of contesters, from single-operator entries to multi-operator, multi-transmitter stations. While the current status indicates scores are not immediately available, the database's primary function is to archive and present the outcomes of events like the ARRL DX Contest, Sweepstakes, and Field Day. This historical data is crucial for tracking individual progress, identifying top performers, and understanding the competitive landscape within the amateur radio community.

Two tables comparing several coax cables on attenuation and power ratings

Kennedy Safaris, cheap,well organized and ham radio friendly

Microphone tips for the Icom 706MkIIG

Basic site with links to amateur radio information and scanner info

More than 400 Dutch Hamradio links

Singapore Amateur Radio Transmitting Society

New Zealand ham radio map

Ham radio HF antennas manufacturer, produce HF dynamic beam antennas, and vertical pole antenna. Offer kits and parts to build you own dynamic antennas, by IZ0AEG

Ham radio blog from mexico mainly in spanish

A non-profit public service and educational amateur radio organization specializing in advanced and experimental microwave communications.

First state amateur radio club

Amateur radio links to ui-view/aprs sites plus various other bits

This is the web site dedicated to all the Amateurs Radio, SWL and BCL looking for news and info, DX'ing and all about that, in italian

A group of local hams who operate nightly on simplex and discuss all sorts of topics

Web Site Amateur Radio station from Ukraine Kharkov

Ham radio Dxpedition

Ham radio links and more

Ham radio shop in South Salem, NY, dealer for Alinco, LDG, Cable X-perts, Jetstream and several antenna types and makers

Red River Radio Amateurs - Fargo/Moorhead

Software defined radio products. Maker of AFEDRI SDR a direct sampling Software Defined Receiver by 4Z5LV

Amateur radio kits. Makers of the WinKeyer, their goal is to keep homebrewing and kit building alive.

The Highland Amateur Radio Association (HARA) centers itself in Hillsboro, Ohio.

OBARC is an active organization participating in field day, various operating events, special events and contests

Demonstrates the design and functionality of _uLog_, a Windows-based logging application for amateur radio operators. The resource details its core purpose as an easy-to-use logbook, emphasizing its streamlined interface that provides only the basic fields necessary for efficient QSO entry. It positions _uLog_ as a practical alternative to more complex logging software, catering to operators who prefer simplicity and speed in their logging workflow without an abundance of advanced features. The application's utility is highlighted by its focus on fundamental logging tasks, distinguishing it from comprehensive contest loggers or DX cluster clients. While not explicitly comparing it to other specific software, the description implies its niche for everyday logging rather than specialized operating events. Its design philosophy prioritizes quick data input, making it suitable for casual operating or for those who desire a minimalist approach to maintaining their station log.

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

The _Sci.Electronics FAQ: Repair: RFI/EMI Info_ document, authored by Daniel 9V1ZV, provides a detailed analysis of computer-generated RFI/EMI, focusing on its impact on radio reception. It identifies common RFI sources such as CPU clock rates (e.g., 4.77 MHz to 80 MHz), video card oscillators (e.g., 14.316 MHz), and even keyboard microprocessors, all of which generate square-wave harmonics across HF and L-VHF regions. The resource outlines a systematic procedure for pinpointing RFI origins, including disconnecting peripherals and using a portable AM/SW receiver with a ferrite rod antenna to localize strong interference sources. The document categorizes RFI mitigation into shielding, filtering, and design problems, offering practical solutions for each. It recommends applying conductive sprays like _EMI-LAC_ or _EMV-LACK_ to plastic casings of radios, monitors, and CPUs to create effective Faraday cages, emphasizing proper grounding and avoiding short circuits. For filtering, the guide suggests using line filters, ferrite beads, and toroids on power and data lines, and small value capacitors (e.g., 0.01 uF for serial/parallel, 100 pF for video) to shunt RFI to ground. It also discusses the use of bandpass, high-pass, low-pass, and notch filters on the receiver front-end or antenna feed to combat specific in-band noise.