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W1WD review and reception performance test of the Elecraft K3 transceiver.

An excellent and comprehensive article on portable HF operations with attention on selecting proper equipment

Converting the Jabra A210 Bluetooth Interface for Ham Radio

Amateur radio map of Italy with WW locators, provinces abbreviations and Call sign Prefixes, in a A3 size PDF file free to download, made available by IU3KJL Davide

Converting the GN9120 Wireless Bluetooth Interface for Amateur Radio

Making RF probes with parts you already have

Official site of ARI Comitato Regionale Friuli Venezia Giulia

The short history of the SSN Smoothed Sunspot Number at Luxorion

An homemade RF spectrum analyzer with full details on construction notes and planning. Includes block diagram, schematics and pictures

This amplifier uses two 60w Spectrian amplifier boards with the usual input and output hybrid coupler and combiner.

An interesting rf coaxial switch project capable of handling 800-1500 W. This is a cheap home made RF coaxial switch in use by PA0FRI

Rotatable Antenna with Phased Elements based on the orignal design concept of HB9CV antennas, is considered to have an higher gain than standard quad antennas. The Swiss Quad Antenna does not need any spreader or boom.

RF Coaxial connectors, adapters, installation and test kits, Coaxial cable assemblies

Mic online calculator , Microphone Dynamic Range Calculator, Microphone Sensitivity Calculator

RF Safety reource page with links and more documentation on radio frequency safety

PowerFilm, Inc. develops and manufactures thin, flexible solar modules for OEM, military and consumer needs.

Develop, design, manufacture and test a wide range of RF Amplifier products including highly linear class A Broad Band, Cell Band, Pulse, AM & FM broadcast and Military VHF.

RadioMasterList, a comprehensive receiver and transceiver directory. Performances and specifications for every radio set

Reducing and removing RFI Noise

An improved version of the audio interface commonly used to connect a computer soundcard to a transceiver\'s receive and transmit audio circuits

A PDF Presetation from the W0DXCC Forum on how to improve the performances of the popular Yaesu FT-2000 transceiver

Nearly half of all reception problems are due to deficiencies or faults in the television receiver, the aerial lead or the aerial. This article will help you to check whether the problem you are having is due to one of these causes.

This article will explain a few of the ways author use an external SDR and Linrad to enhance his K3 experience. Linrad is one of many available SDR receiver programs. The same could be done with any radio that lets you access its IF frequency output. Article from NCJ Nov Dec 2019

An article by microHam about guidelined to eliminate problems caused by RFI

WA1MBA article on RF connectors for microwave

New Club Site For Maidstone YMCA ARS

The Homebase-10 is a wire halo antenna for 10m built with DIY store parts, effective despite its small size. Includes a dual-band version for 10m and 6m with gain around 0 to -2dBd, near omnidirectional pattern, and horizontal polarization. Overview based on a 2008 Practical Wireless article.

An online multiple calculator of 16 impedance matching networks

KA0KA ESSB with the Kenwood TS-850/DSP-100 project

Wfview is a program that allows many modern Icom ham radio transceivers (such as the IC-7300, IC-9700, IC-7610, IC-R8600 and many others) to be controlled via a computer. wfview shows the gorgeous spectrum display on whatever display is connected, including projectors, touch screens, and TVs. wfview allows for full radio control from a computer keyboard and basic control from a numeric keypad. It works under Windows, Linux and MacOS

How to properly solder a CB Coax Cable to Connector

A folded dipole is an antenna, with two conductors connected on both sides, and folded to form a cylindrical closed shape, to which feed is given at the center.

Design, develop, test and manufacture a wide range of Amplifier products including highly linear class A Broad Band, Cell Band, Pulse, AM & FM broadcast and Military VHF

An universal antenna tuner interface, the Kenwood Remote LDG Tuner Interface by af6sa

A homemade interface for any android device, allow to receive and trasmitt SSTV PSK RTTY from an android tablet based on the DD7LP original project include demo of a sample DIY kit.

Effect of radials on the efficiency of antennas.

RF Wattmeters - RF Power Measurement - Bird Wattmeters Telewave - Coaxial Dynamics Wattmeters - Daiwa Wattmeters

Tatar-Bashkir Service Site

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.

The prototype for this amplifier was originally designed for 70cm and was used on the 2004 3B9C Dx-pedition to Rodriguez Island for satellite and EME. It had a noise figure of 0.49dB with an associated gain of 20dB.

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.

Lithuania

RF Coaxial Relays from stock is the answer to your urgent small quantity needs.

A Rig control CAT interface schematic suitable for both the Yaesu FT-817 and FT-100 transceivers.

Amateur radio ham machining mill lathe cannon photo

This project is a USB Audio, Serial and PTT interface for rigs that does not directly support digital modes provided by applications such as FLDIGI, WSJT-X and JS8CALL. Plug these interface devices into your Windows or Linux laptop or Raspbian Raspberry Pi and you can send and receive digital tones to/from your rig and automate the frequency and mode control and PTT control.

An overview about the UHF connectors often referred to as the PL259 plug and SO239 socket used for many RF applications. Limitations, history and soldering properly UHF Connectors

Realization of confortable communications. RF Filters

RF connectors manufacturer