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Review of the Xiegu G90 20W HF portable transceiver capable to run CW SSB AMD modes, based on an Software Defined Radio

Offer a Direct Digital VFO Kits (variable-frequency oscillator) using the Analog Devices AD9951 by WA1FFL

Ham radio information for new CW and QRP operators. Includes operating advice, reviews and articles on kit building/rig repair,

radio.McDougallsHome.net The Web site and Blog of Amateur Radio Station K7JM. Homebrew, Construction, Operating, and Discussion

Victor amateur radio association (w2vtm) Camden, NJ

A very simple experimental short wave radio receiver. This is basically just a crystal radio with two stages of transistor amplification afterwards made with scrap components.

An incorporated, non-profit organization promoting amateur radio and serving the interests of communities in Bonner County.

The Offshore radio guide, watery wireless websites, history pictures and sounfiles

The reading radio club Berks county PA

AMRAD is the Portuguese Association of Amateur Radio for Education Research and Development

An introduction to develpment of morse keys in radiotelegraphy history

k5eok Edmond Amateur Radio Society

This article describes the construction of a high performance transmitter and receiver for SSB (voice) communication covering the 14MHz (20 meters) high frequency amateur radio band with output range 15 to 20 watts and a top audio sound quality both on transmit and receive.

Lone Star Amateur Radio Association

Using a simple calculation, measure the distance between Earth and the Moon with the help of a local amateur radio station

The Madera County Amateur Radio Club was formed for public service, education, scientific and recreational purposes of amateur radio and to elevate the standards of operating practices and ethics in amateur radio communications. San Joacquin Valley California

The Brandon Amateur Radio Society serves the ham radio community in eastern Hillsborough County Florida.

Founded In 1938, The W.A.R.A. Has Been An Anchor For Amateur Radio Enthusiast Throughout North East Ohio.

Crystal radio home made projects by DL2XM

Ham Radio Ads from France by F1UFY

NWRS North Wales Radio Society

Radio Amateurs of Greater Syracuse is an organization involved in promoting public service, fellowship, and ham radio in general, in the Syracuse, NY area. This site provides information, news and events of interest to hams in Central New York.

RARA was founded in 1995 by a group of active amateur radio operators from several regions of the United States. Today, the club is international in scope with over 135 members around the world.

Founded in 1933 in Flint Michigan

The Kentucky Contest Group (KCG) website, maintained by N4GN, serves as a hub for amateur radio operators interested in **radiosport** contesting within Kentucky and southern Indiana. It details the group's dedication to promoting contesting, offers links to KCG officers, membership rosters, and upcoming meetings, and provides access to an active KCG e-mail reflector and Facebook Group for member communication. The site also features a comprehensive list of N4GN's recommended ham radio web picks, covering various categories like contesting resources, DXing, VHF/UHF/Microwave, and propagation information. The KCG's map center coordinates were updated on May 16, 2015, shifting approximately 16.5 miles SSW to 37° 21' N, 85° 39' W. Despite acknowledging current inactivity and an outdated web presence, the group remains operational, exploring options for reorganization, including a potential merger with the Tennessee Contest Group (TCG), which was ultimately rejected. The site emphasizes that membership applications are considered from anyone with a genuine interest in contesting.

G8YMM Amateur radio web site with interest on ATV

Dundalk Amateur Radio Society. Ireland Calsigns EI7DAR EI0W

2-Meter Weak-Signal Enthusiasts

With the new name TRANSRADIO, the former TELEFUNKEN SenderSysteme AG enters into the new digital age of Broadcasting – DRM.

Clay County Missouri

CCARS - Camden County Amateur Radio Society. Supporting the Department of Homeland Security's Emergency Communications Initiative while promoting Amateur Radio activity and fellowship in and around Camden County Georgia

Ham Radio Outlet South Africa based in Port Elizabeth

Miscellaneous ham radio stuff from K2DBK

Effect of radials on the efficiency of antennas.

Receivers and transmitters by Collins , Drake , Hallicrafters , Hammarlund , National Receivers

The Society Radio Operators, Chicago Illinois

Developing operational amateur radio equipment for the 134 GHz band presents significant technical challenges, particularly in frequency generation and stability. This resource details the construction of a 134 GHz system, outlining its architecture with separate transmit (Tx) and receive (Rx) modules, each employing a local oscillator (LO) and RF head units. The system utilizes a dual Flann 50 GHz lens-type horn antenna configuration for optimal signal coupling. The transmit path incorporates an LMX2541 synthesizer chip operating at approximately 2.8 GHz, referenced by a 10 MHz double-oven Morion OCXO for exceptional stability. This signal is multiplied through a series of stages (X4, then X2) to generate a 22.4 GHz signal, which subsequently drives a dual series diode multiplier to produce the final X6 signal for 134 GHz operation. The receive side features an anti-parallel diode mixer coupled to a 144 MHz transceiver via a preamplifier, ensuring effective downconversion. Operational mode is CW, achieved by keying a multiplier stage. The project includes images of the Tx and Rx head units and describes a successful 3.5 km test with G8ACE, demonstrating stable signal tones due to PLLs locked to OCXOs at both ends, confirming the system's robust performance.

Houston Ham Radio Club BVARC is an amateur club located in the southwest Houston Texas area

Showcasing innovative RF solutions, Hofi Hochfrequenztechnik manufactures high-quality _antennas_ and RF switches. Their products, including the **versatower** and **fritzel** brands, cater to both casual operators and serious DXers. With a commitment to performance, Hofi's offerings enable operators to achieve optimal signal gain and reliability in various conditions. The company's expertise in antenna design ensures that users can effectively communicate across _HF_ bands, enhancing their overall operating experience. Whether setting up a new station or upgrading existing equipment, Hofi provides essential tools for successful ham radio operations.

Provides this Web site as a public service to all radio amateurs within the city of Huber Heights and the Miami Valley of Ohio.

SZ2PRO - Exemplary Radio-amateur Club Greece

The Nanaimo Amateur Radio Association is made up of members of the community stretching from Courtenay to Duncan on Vancouver Island.

The elgin amateur radio society Illinois