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The vertical Double-Zepp 2x7 m is a very simple, effective 8-Band-antenna. The end of the Dipol must be 5-10 m above the ground

iPhone Software to practice taking your Ham Radio Exam

MP3 and Wav files of some stations recorded on HF anc VHF bands by K9MU

Sunstone.com PCB123 PCB download software. Review Sunstone quality pcb design software. Free PCB software download for all of your business needs.

TNC-Pi is a special version of TNC-X designed to interface directly with the Raspberry Pi computer. It can connect to the Pi either via the Pi serial port, or via the I2C protocol.

Amateur Radio in the Blackstone Valley area

Constructing a Compact Low Cost Sprinkler Valve Antenna Launcher

This is another alternative home-brew center connector for a dipole. The parts used are common PVC accesories found at the home supply store.

A project to homebrew a Lightning Detector

Rail Radio Communication Feeds broadcasted from all over the United States and beyond.

ON6MU Low Power amplifier

MARC is dedicated to providing safe and reliable two-way radio communications for selected charity events in their respective regions

Modifications for the Kenwood TS-870S

Using a PC with soundcard as a VLF receiver, how to use your PC as a receiver for narrow-band signals in the VLF radio spectrum by DL4YHF

Testing performances of indoor antenna. A comparison of a magnetic loop antenna vs a classic wire dipole done using wsprlite on 30 meters band.

Hi-Z Antennas offers specialized high-impedance receiving systems, primarily focusing on phased vertical arrays for HF reception. Their product line includes preamplifiers designed for shortened vertical antennas, featuring optimized 15dB gain and array-matched characteristics. These components are engineered to enhance weak signal reception and improve signal-to-noise ratio across the HF spectrum. The company provides controllers for managing multiple vertical elements in a phased array configuration, enabling directional reception patterns. These systems are particularly effective for mitigating local noise and interference, a common challenge in urban and suburban operating environments. Specific offerings include solutions for 160-meter and 80-meter bands, addressing the unique requirements of low-band DXing. Technical details often reference components like the 2N3866 transistor in preamp designs and discuss concepts such as out-of-band attenuation. The focus remains on optimizing receiving antenna performance through impedance matching and active amplification, rather than transmit capabilities.

A workbench instrument capable of testing transistors, diodes, FETs, usefull constructing QRP circuitry.

The Voice of Idaho Amateur Radio Club Website. News and information from Treasure Valley and surrounding area

How to repair a FT1000MP front end, damaged from too much neighbouring RF during contesting

Long Beach Los Angeles county live scanner feed

Loop Antenna Basics and Regulatory Compliance for Short-Range Radio

Small, but growing, group of amateur radio enthusiasts, most of whom are within 90 miles (and more) of Atlanta

Over 45 years of dedicated work by Robert Sherwood, NC0B, culminated in a wealth of technical insights, particularly concerning **receiver performance** and the intricacies of transceiver design. The site provides access to numerous presentations from events like Dayton Contest University and W4DXCC, covering topics such as optimizing rig performance, the evolution of lab testing, and the impact of roofing filters on transmitted IMD and receiver characteristics. These resources offer detailed analyses and practical advice for serious operators and contesters. While product manufacturing, including the SE-3 MK IV synchronous detector and various Drake R-4C accessories like roofing filters and cooling kits, has ceased, the legacy of technical documentation remains. The site details specific products like the Icom IC-781 and R-9000, and offers insights into 455 kHz mechanical and crystal filters, along with DSP protection strategies. Crucially, the site features extensive receiver test data, allowing radio amateurs to compare the performance of various transceivers. This data, often presented in white papers and slide shows, includes detailed measurements and explanations of key performance metrics, serving as a valuable reference for understanding and selecting high-performance HF gear.

Articles about Amateur Radio, own writings and translations: history, DXpeditions, contesting and DXing ethics, Codes of Conduct, Suggestions for Pile-ups, Suggestions for Contesters, the most wanted DXCC entities.

For radio amateurs seeking to identify or verify callsigns from Bosnia and Herzegovina, an online callbook service offers a direct search utility. This resource focuses exclusively on the _T9_ prefix, allowing users to input a specific callsign and query a dedicated database. It serves as a historical reference for contacts made prior to its last update. The utility provides a straightforward interface for callsign lookups, presenting results based on data compiled up to _July 31, 2000_. While the information is static and not current, it remains useful for confirming older contacts or for historical research within the amateur radio community. The service is maintained by _Boris Knezovic, T93Y_, offering a focused resource for this specific geographic region.

A web site dedicated to collecting and restoring antique crosley tube raidos. pictures and descriptions of antique crosley tube radios from the twentiew, thirties, forties, and fifties. radio advertising from the twenties, thirties, forties, and fifties. tube box art. links to many antique radio related sites.

Wiki Site dedicated to radio scanning info in New Zealand

Ham Radio Class Exam question pool effective 7/01/2010 thru 6/30/2014

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

CLOVER-2000 is a faster version of CLOVER (about four times faster) that uses eight tone pulses, each of which is 250 Hz wide, spaced at 250-Hz centers, contained within a 2 kHz bandwidth between 500 and 2,500 Hz

Digital radio mondiale DRM products, measuring tools, Magnetic field probes, RF power meters, Broadband loop antennas, DRM devices and services

UN Radio - (United Nations) - IRN Internet Radio NEXUS.

Chinese Taipei Amateur Radio League

Double T Bar Vertical antenna are vertical antenna with cross bars on the top and bottom. These crossbars provide capacitance loading thus reducing the size of the antenna

GAP Titan DX 10 15 20 40 meter performance tests by AA3RL

VE1FQ, has a long history dating back to 1932 and may be the oldest Amateur Radio club in Canada.

Radio Singapore International

Based on a simple project based on a 2 elements Yagi for 20m band, and then becomed a triband yagi with a open-sleeve feed system

Many link's of other Groups, Canton Ticino and pictures of Ticino

European Telecommunications Satellite Organization

A magnetic loop antenna for the VHF band, featuring a high gain that can be compared to a quarter wave vertical antenna

Random Length Multiband Dipoles can be a good solution for field day operations or outdoor activity, read more at ARRL web site

This antenna article is geared towards new Hams and antenna builders looking for a very inexpensive 6 band antenna that can be efficiently fed with 50 ohm coax without a tune

Tubes, military manuals and surpluss

A mail list for those interested in the new Amateur Radio MFSK modes.

Beginners guide and introduction to get started in ham radio if you live in India

A simple project for an effective home made band pass filter, designed for the portable field day usage

Eham user's review on the Heathkit SB-200 HF amp

W0IPL article on NVIS Antenna