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Schematics of antenna couplers in french

A simple RF power amplifier initially designed for 40 meter band can work on 10 15 20 40 80 meters

Universal radio IC-V8000 page includes accessories and photos

A home made sweeping signal generator up to 2 GHz

High Power RF Amplifiers by Delta Sigma, Inc

An engineering oriented organization specializing in the design and manufacture of high performance parabolic antennas, 3dB high power RF couplers, Antenna power splitters, directional RF couplers and more items for RF transmission from HF through Microwave frequencies.

The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply by ON6MU

Grahams Goldcoast Australia Radio Scanner Frequencies

C Band Transverter for 5668 - 434MHz

HF power amplifier project powered by GU-78B by SV8JE

Are you having RF problems in the shack since you put up your HF vertical antenna? This is a common problem with an easy solution.

The document is a technical guide on designing RF filters for radio frequency applications. It covers topics such as interference suppression, band-pass filters, and low pass filters, with a focus on filter design and circuit filters.

Minimal interface circuits for receiver and transmitter audio, also for PSK31

PTT and soundcard interface schematic by ON6MU

Make your own interface, two schematics for building an interface using the RTS line by N3UR

If your doing any home brewing gear for ham radio its a great idea to have a dummy load. This will to your radio be the perfect antenna...it will never radiate but your radio sees a perfect 50 Ohm impedance.

IC820H or other Icom Radios Soundcard interface for VHF EME use by DF9CY

Drawing and plan for an HF magnetic loop antenna

A simple RF oscillator by Harry Lythall - SM0VPO

Need to interface both a TNC and the computer soundcard? This is a ICOM 756PRO ACC1 audio/keying/FSK interface by WA0SXV

RF and Microwave Power Amplifier and Transmitter Technologies, amplifierlinearity, efficiency and available RF power devices.

RF Power Meter using for reading a standard Digital Voltmeter by Iulian Rosu, YO3DAC / VA3IUL

This small, light weight digital SWR and power meter uses an Atmel AVR Butterfly demo board and a Stockton type directional coupler.

VectorFox is a software born to incorporate a PC into the fox hunting environment. VectorFox is able to take inputs from up to 5 sources, such as a 2m beam, a 2m signal meter, a TDOA, etc, and display the results on the screen. VectorFox also accepts Agrelo inputs. From these results the operator can choose which indication is best and have a line drawn on the map in the direction of the signal.

D-PRS Interface is written to provide a universal interface between APRS clients and an Icom D-STAR enabled radio with a low speed port.

Operating on the amateur radio bands, DXers rely on timely information to chase rare contacts. This resource offers a specialized web interface for accessing DX cluster data, specifically designed for mobile phone displays. It presents real-time **DX spots** in a compact, easy-to-read format, stripping away extraneous elements often found on traditional cluster interfaces. The core functionality focuses on delivering essential spotting information—callsign, frequency, mode, and comments—without requiring complex navigation or excessive data loading, which is crucial for mobile data usage. The utility of this mobile-first design becomes apparent when operating portable or away from a shack. Unlike full-featured _telnet clusters_ or web-based aggregators, DXLite prioritizes quick access and readability on small screens. The interface displays a continuous stream of spots, allowing operators to rapidly identify potential DX opportunities across various bands. Its minimalist approach ensures fast loading times and efficient data consumption, making it a practical tool for on-the-go DXing and contesting.

Understanding and solving RF interference problems using ferrite

An 80 meter band vertical loop antenna setup

RF shop is an Australia online retailer of Radio Communications, Electronics, RF and Microwave component products.

Audio setting and improvements for Yaesu FT-2000 by k6jrf

Lage collection of 6 Meters and 2 meters QSOs, recorded in real audio format by OE3MWS

The Resonant Feedline Dipole (RFD) HF antenna design utilizes a single piece of coaxial cable and a stranded wire section, forming a 1/4-wavelength radiator. This configuration, based on a 1997 ARRL Handbook design (page 20.17), functions by RF traveling on the inside of the coax shield and returning on the outside, creating the second half of the dipole. A choke wound into the feedline prevents RF current from flowing back down the feedline. Construction details include using RG-58a/u coax for a 75m version, with a 1/4-wavelength section of stranded wire soldered to the center conductor. The document provides choke dimensions for RG-213, RG-8, and RG-58 coax across 3.5 MHz to 28 MHz, specifying cable length and number of turns. Dipole dimensions are also tabulated for frequencies from 3.6 MHz to 28.4 MHz, listing overall length and individual leg lengths. Field tests included deployment near Bryson City at 5 feet off the ground and as a sloper during WCARS Field Day in Asheville, yielding successful local and regional contacts.

RFAC Solutions specializes in providing a range of RF components, including various connector types, cable assemblies, attenuators, and filters. Their product line features common connector standards such as SMA, BNC, TNC, N-Type, MCX, and MMCX, essential for reliable RF signal paths in amateur radio and commercial applications. The company also offers high-power VHF amplifiers, catering to needs for signal boosting in specific frequency ranges. Their offerings extend to dust caps and adapters, which are crucial for maintaining the integrity and versatility of RF systems. The focus on supplying components from South Korea suggests a commitment to specific manufacturing standards and supply chain practices. This resource details a vendor's product scope, useful for hams sourcing specific parts for shack builds or antenna projects. Jeff is listed as a contact for inquiries.

LOGic presents a commercial logging software solution for amateur radio operators, detailing its capabilities for managing QSOs, controlling transceivers, and facilitating DX operations. The resource outlines features such as comprehensive logging functionalities, support for various operating modes, and integration with rig control interfaces. It emphasizes the software's long history, having been available since 1989, and its continuous development to meet the evolving needs of the amateur community. The software's practical application extends to contest logging, award tracking, and interfacing with external hardware like CAT interfaces for seamless rig control. The resource highlights its flexibility and feature set, positioning it as a professional-grade tool for serious DXers and contesters. Specific mentions of TRX-Manager and W1GEE indicate related or integrated hardware and developer involvement, providing context for its ecosystem.

Here is an old ham radio operators trick for cleaning wires for soldering that are old and corroded. It is hard to find this technique printed anywhere!

Radio frequency systems require robust protection against transient voltage events, which can severely damage sensitive equipment. This resource details a range of **RF surge protection** devices, including models with DC Pass, DC Block, Bias T, and Ultra Low PIM characteristics, designed to safeguard critical infrastructure. It also presents various RF filtering solutions and interconnect components, emphasizing their role in maintaining signal integrity and operational continuity across diverse applications. The site provides information on products engineered for both RF and data line protection, highlighting their utility in preventing downtime and equipment loss. Specific product categories encompass coaxial protectors, grounding items, and fiber optic solutions, indicating a broad scope of application from amateur radio installations to industrial and telecommunications networks. Furthermore, the resource mentions the availability of NOM-certified products and offers same-day shipping for many items, underscoring a commitment to rapid deployment and compliance with industry standards.

This interface is intended to be used with all the popular digital modes like PSK31, RTTY, Olivia, etc., which modulate a continuous carrier.

Web based VHF-UHF RF planning powered by SPLAT! and Google Maps. Access via website, Android App or dynamic Google Earth interface.

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

Ebook by Akira Matsuzawa Tokyo Institute of Technology, Building blocks in RF system and basic performances, Device characteristics in RF application , Low noise amplifier design, Mixer design and Oscillator design

Homebrewed handheld RF powermeters for various sensors by DL5NEG

Connecting the iPad or the iPhone to a Yaesu FT-817 using an home made cable, using common digital modes like PSK31 RTTY and SSTV. Article by Andrew VK3BQ

In this article K3DAV show a very simple way to make an RF choke coil that will remove your RF feedback troubles

Thierry LOMBRY, ON4SKY, develops in several long articles the bascis of propagation. His website includes also a French section dealing with auroras.

CARF combines the wonderful world of amateur radio with Christian fellowship and service

US Antenna manufacturer offering base and mobile antennas for 2 meter, 1.25 meter and 70 cm Amateur Radio GMRS and MURS Citizens Band Radio VHF and UHF Business Band Radio HF, VHF and UHF Scanning

Rutherford County Sheriff and Fire Live Scanner Audio Feed on RadioReference.com

Optimization tests of the W3EDP multi-band HF wire antenna a popular aerial among QRP enthusiasts because it is light weight and cheap.

This simple and cost effective interface circuit is designed for use with any ICOM amateur radio equipment with CIV interface

Radio shack rental in greece by Jurgen Eisinga - DL2YAG - SV0IE