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A blogspot blog about Software Defined Radio

Designer and supplier of tower reinforcement systems to the wireless industry.

Homebrew Tube Projects, Vacuum Tube Data, Articles From Old Handbooks

An overview of the basics of the horn antenna used in RF microwave applications.

The AT-AUTO automatic antenna tuner handles 1.5kW CW operation, employing stepper motors under microprocessor control to precisely position a roller inductor and air-dielectric variable capacitor, avoiding relay-switched discrete components. This design choice prevents loud relay clacking and burning contacts, a common issue with competing products. The tuner features auto-retuning capabilities and receives periodic firmware updates, ensuring continuous improvement and added user-requested features. Its companion product, the _CX-AUTO_ coaxial switch, also features an embedded microprocessor controller. It enables selection of 1-of-8 coaxial outputs via a serial data interface. When integrated with the _AT-AUTO_, the tuner can associate specific coaxial outputs with amateur radio bands, automatically commanding the _CX-AUTO_ to select the correct antenna when the operator QSYs to a different band. Don Kessler began designing the AT-AUTO in 2005, with its debut at the 2006 Dayton Hamvention. Kessler Engineering also offers custom RF product design and electrical engineering consulting, specializing in Class-E RF amplifiers.

New unused surplus and used electronic test and laboratory equipment including spectrum analyzers, signal generators and oscilloscope

Dedicated to CB radio promotion in Portugal.

Amateur TV, Satellite TV Equipment, Broadband Via Satellite, Weather Monitoring

G0HWC details and HTML files with images to build yourself a Ham Radio website. Get your Ham Web Site on the internet for free

Baycom modem, The famous "PMP" (Poor man packet!)

This article describes the development of two tunable antennas each consisting of three interconnected small loops and capable of providing excellent DX performance. The aerials are home-constructed, and located in a very small garden with a minimum of visual impact on the neighbours and are low enough in height to avoid the attention of UK planning authorities.

Rotation-Shift Keying description, imlementation and test results. Orthogonal BPSK, Twist Modulation, Moon Bounce

Server allowing operation of the Winkey USB by K1EL with any Linux program with UDP keyer capability.

A Comparison of most popular Amateur Radio Digital Voice Systems DMR D-Star System Fusion presented by W9HPX Roland at the Charlotte Digital Radio Group in a comprehensive article about Digital Voice

Online shop for obsolete electronic components, tubes and semi-conductors

Listen to live police radio scanner from Dallas

H.A.R.A.O.A

WD0M installation of the Hex Beam by SP7IDX

Matching with a half wave or wuarter wave coaxial cable is pretty well known, but an existing 1961 system to do that with two one-twelfth-wavelength transmission lines.

The RYMSA Corporation designs, manufactures and distributes a wide range of sophisticated antennas and components for the telecommunications industry supplying technical solutions tailored to the needs of its clients around the world.

This processor controlled autoranging sniffer has become popular for vehicle based foxhunting in Australia

Solar Powered Station

A dual band dipole antenna for 40 and 80 meters band. Total lenght of 26 meters, foreseen two coils at aprox 11 meters distance from center feed.

Anderson Powerpole connectors are becoming the standard for Raynet ARES and RACES groups as well as many Ham radio shacks round the world. This recourses page will give you a guide to Anderson Powerpole connectors in the radio shack.

Synthetic guy ropes and accessories for antenna support systems

The Radio Operators Association of Dallas (ROADS) Club exist to promote interest in amateur radio communication and experimentation, fostering of education in electronic communications as it applies to amateur radio, development of individual efficiency, cooperation among members. and furtherance of the public welfare.

Yaesu Vertex VX-170 FM 2 meter handheld specifications by Universal Radio

Trophy program have 15 plaquiettes of expensive wood.

Listen to live radio scanner feed of Dallas Police 1 Central - 2 North East

Professional CB Radio Repair. Have repaired CB Radios and 10 Meter Radios for over 30 years

Demonstrates the complete design and development process for a **Low Noise Microwave Amplifier** (LNA), beginning with conceptual design and progressing through prototyping. The tutorial series covers the initial stages of a single-ended first gain stage, focusing on critical parameters such as noise figure, gain, and stability. It systematically details the theoretical underpinnings and practical considerations for achieving optimal performance in microwave frequency applications. This resource provides a structured approach to LNA construction, enabling radio amateurs and RF engineers to understand the iterative steps involved in realizing high-performance receive-side amplification. It offers insights into component selection, impedance matching networks, and the measurement techniques required to validate design specifications, particularly for **microwave** band operation where noise performance is paramount.

By Floyd Sense K8AC

Promote the activities Brazil YL and BRYLA award

Military radio sets for land, sea or air from new current production, unused or rebuilt u. s. military surplus and their accessories and spare parts since 1946 your reliable one stop source.

EasyEDA - Web-Based EDA, schematic capture, spice circuit simulation and PCB layout Online.

FMI provides superior solutions in the design and manufacture of frequency control devices including Voltage Controlled Temperature Compensated Crystal Oscillators (VCTCXO), voltage controlled crystal oscillator (VCXO), Temperature Compensated Crystal Oscillators (TCXO), crystal clock oscillators, high temperature oscillators, surface mount and crystal oscillator products, phase locked sources and more.

Yaesu FT-100D Active Interface for the Codan 9350 and Comet SB-15 Antennas

This resource compiles claimed scores, often referred to as "rumor scores," for numerous amateur radio contests, providing a historical snapshot of competitive activity from 1993 through 2007. It lists entries for prominent events such as _CQWW CW_, _ARRL Sweepstakes_, _IOTA Contest_, and various _NAQP_ events, categorized by year and contest. Each entry typically includes the contest name and the month/year of operation, allowing users to quickly navigate to specific contest periods. The site also references the _3830 Web Page_ on Contesting.com as the primary submission portal for these claimed scores. The collection offers a unique perspective on contest participation and performance trends over more than a decade, preceding the widespread adoption of real-time score reporting systems. While not official results, these rumor scores provided early indications of top performers and overall activity levels for a wide array of HF and some VHF contests, including _ARRL 10M_ and _CQWW VHF_. The historical data can be useful for analyzing past contest popularity, identifying consistently strong operators, or simply reminiscing about earlier competitive eras in amateur radio.

MMSTV help pages, describing how to setup and run this sstv program by Andrew O'Brien

W1AEX Audio settings and general observations

A page dedicated to servicing and building a 10 meter band moxon Antenna

CB resource site in Quebec

Yaesu Certified European Distributor and Authorized Service Center based in Italy

Noise Canceller kit originally developed about 1989 by G4WMX and GW3DIX and improved by DK9NL and DG0KW.The VK5TM Noise Canceller is another version of the design, with the HF Vox circuit removed and a couple of other minor changes, including the use of SMD JFETs and a double-sided pcb.

Summary, tutorial about the basics of what is a waveguide and the basic waveguide theory.

Stocks some NOS Heathkit parts

Dealer of digital and analog panel meters Products include portable test equipment, oscilloscopes, recorders and temperature sensing equipment

Laser Engraved, Etched and Marked gift items for Amateur Radio Operators

160 to 40 meters inverted L antennas projects