Maker of small and compact multiband QRP UltraLight Magnetic Loop Antennas and UnUn transformer for end-fed multiband antennas

This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer.

Gimme Five reloaded, a compact 5 band QRP SSB transceiver in SMD technology. This unit covers 5 bands within the amateur radio spectrum (3.5, 7, 14, 21 and 28 MHz). Receiver is a single conversion unit with an interfrequency of 9 MHz. Transmitter uses 5 stages and has got a power level of 10 watts PEP output.

Building a simple delta loop is very easy. With two fishing rods and some other material you can find in your local hardware store, you can build an efficient single element delta loop antenna

GridTracker listens to live traffic from WSJT-X or JTDX and displays it on a map. It can also load ADIF log files, load clublog, lotw, hrdlog.net and other sources to diplay your logbook statistics and map your QSOs. GridTracker is a free application for windows Linux and MacOS.

The Null-modem emulator is an open source kernel-mode virtual serial port driver for Windows, available freely under GPL license.Allows you to create an unlimited number of virtual COM port pairs and use any pair to connect one COM port based application to another.

Contest log checker to detect QSO band passes. The PASS program reads a Cabrillo log and reports the QSOs that were passed (moved) from one band to another. The program is not graphical and it is meant to be run at a DOS prompt or in a CMD window under Windows.

This online map shows the IARU beacons. If the clock on your PC is accurate enough, it will also show which ones are broadcasting at the moment and on which band.

An online version of a fully automatic morse code teaching machine. This morse machine permit to select several different options including speed, volume, tone and set of characters. This version works works with any HTML5 browser.

The current EiBi shortwave radio schedules, contains an update aggregated list of radio broadcasting stations schedules. File is provided in text format and is availale to download for free.

An easy to build double quad antenna that can be used as an antenna for beginners, it features a wide angle providing a generous alignment.

Adjust date and time of your Icom transceiver from a Windows PC. Compatible with IC-705, IC-7100, IC-7300, IC-7610, IC-7600, IC-7851 (7850), and, IC-9700

Home made free utility can be useful to monitor which is the RX and which is the TX VFO and the correspondig frequencies. Works with Yaesu FT-5000.

Home made freeware utility that allows to power on or shutdown the Yaesu FT rig. It has been tested on the FT-5000. It works also on FT 450 950 1200 2000 3000 5000 9000. It does NOT require any installation, just the exe files. Available in client server mode for remote connections

Main Trading Company, MTC Radio has been helping Hams All over the country since 2009. Amateur radio dealer of popular hma radio brands based in Texas

A small windows utility to control VFO of the Yaesu FT-5000. It is capable to set frequencies for both VFOA abd VFOB. Tested with latest windows versions.

Free windows world map application display current time, sunrise and sunset, greyline map, dx stations, requires windows 7 or higher. The program includes three resized Natural Earth maps which have been resized to 4k or slightly less. By Simon Brown G4ELI better known as the inventor of Ham Radio Deluxe.

NVIS antennas, also known as Near Incident Vertical Skywave antennas have a high angle of radiation. Something on the order of 60 degrees, to straight up to 90 degrees. A portable, easy to setup and cheap nvis antenna project.

Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to “compute” the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.

Project for DXers and experimenters alike. An old article publishes by 73 Amateur Radio magazine in PDF format, where all the components required to build your own HF spectrum analyzer may be found in a well-stocked junk box.

A 2m 70cm Dual Band J-Pole antenna for 35 USD. An excellent performing J-Pole type antenna, constructed from readily available materials.

This is a Solid State Amplifier Project. It uses 4 MRF150 MosFet Power Transistors. The Power Supply Voltage is 50 VDC at 21.5 Amp. The max power available is 1,075 Watts. The Efficiency is about 65% +/- and runs Class AB Solid State.

A selection of speakers or headphones for use with amateur radio equipment. Includes an interesting paragraph comparing Dynamic and Electret Condenser Microphones, but also about audio Equalization.

A polarity checker is a very useful item to have around the shack and in a go-kit. This project, inspired by a QST article on powerpole connector protection illustrate how to build a polarity checker.

A guide to choosing the right hardware and a guide on how to install DXSpider on a Raspberry Pi3. This article include a video and a PDF guide about the installation.

Antenna insulators manufacturer, CQ Antennas provides great quality amateur radio gear to amateur radio operators and trusted emergency preparedness pros at a great price

Download the Yaesu VX-8R Cheat Sheet PDF File

How to solve RFI problems caused by the charge controller, which is a PWM type charge controller, that generates a lot of EMI interference

A spectrum analyzer is always an usefull amateur radio test equipment that should be present in a radio shack. Hams can use it for testing frequency response of filters, amplifiers, and other two-port RF devices. This article illustrate a tracking generator compatible with any spectrum analyzer in the Tektronix 490- and 2750-series lineups

An article on amplitude modulation (AM) operation on VHF bands.

A top band shortened vertical antenna project. This project includes drawing and MMANA-GAL output screens.

Make and automatic antenna tuner based on Arduino and using economic card. This ATU Project can be installed outdoors and controlled remotely by an rs485 link

UK based manufacturer of digital mode PC fully isolated interfaces. Includes several types of interfaces including USB interfaces for CW and Digital modes

How to improve your transmitting antennas for very low solar activity periods, vertically polarized 160 meter antennas, horizontally polarized 80 to 10 meter antennas, single or stacked yagis, multi-tower stations

Tuning into the airwaves for new and interesting transmissions has fascinated enthusiasts since the very earliest days of radio. As a result of advances in computer and radio technology, the equipment packed radio rooms of the past are now replaced by scanning receivers sometimes just the size of a mobile phone. What can radio receivers/scanners pick up? What types of radio receivers/scanners are there? What can and cannot be monitored legally? Best practice when using a radio receiver/scanner

Ferrite-shop is an on-line shop for ferrite toroids, cable cores and cable clamps based in The Netherlands

Cable for connecting APRSdroid to a Baofeng UV-82 Radio (APRS via RF)

An home made VNA made with Arduino Nano. This project features an LCD display 4×20 works from 1 MHz to 60MHz, can use bluetooth connection with Blue VNA android app.

A website dedicated to RTTY with several articles and information on teletypes from history to operating RTTY on ham bands

A true detective story about a interesting repair project, putting back to life a malfunctioning HP 8753C VNA that was rebooting after startup with noise and clicking sounds produced by the attenuator and switch relays.

If you thought you knew everything about balun performance characteristics, there is an important figure of merit you may have neglected

A collection of videos on antenna gain and explanations of how some antenna designs may perform better than others based on how their radiation pattern is drawn. Understanding how one antenna can gain more in reception and transmission than another can be complicated, but with these videos the author has without any doubt made it easier.

To connect the external keypad to your Icom radio you’ll need to make a connector cable like this.

Comparing the Kenwood TS-2000 vs TS-590S from an operational point of view. Pro and cons of both transceivers has been compared by the author.

The JUNIOR-2 presented here is a competition direction finder receiver that is easy to build and tune, but has all the features of the “big” receivers. It is especially suitable for beginners, young people or youth groups who have so far refrained from purchasing a 2m direction finder receiver for financial reasons.

The history of the radio is a fascinating one that changed how the world connected and communicated from distances both far and near. History of the Radio from Inception to Modern Day

G5RV SWR Analysis of a Radiowavz 10m-80m full length antenna made using a RigExpert AA54 antenna analyzer.

P29RO online log of Papua New Guinea DX Pedition 2022 powered by club log

Online world map with live updates from the DX Cluster network, displaying new spots on the maps as they appear. Filtering options are available including bands, source continent and dx continent.

Passive Bandpass Filter online calculator and filter formulas. Active Inverting Op Amp Bandpass Filters, Active Noninverting Op Amp Bandpass Filter, just enter the Low ir High Cutoff Frequency

Online web chat dedicated to FT8 users. FT8 DX Cluster is included in the central part. This is a widget part of the DXCenter suite tools.

Arduino Flex Controller can be used with the new Flex 6000 Signature rigs. It is a DIY project and in these pages you will find all the informations you need to build and program your own. It is a perfect companion when used next to the official SmartSDR program but it can be used in stand-alone mode, without a PC.

The complete software suite to Edit, Analyze, Generate Statistics, View multiple logs simultaneously, Map QSOs, Import and Export to Cabrillo or ADIF files. The Contest Log Analyzer has been developed as a complete database management application, where you can create separate Databases, containing several Logs, a convenient way to save, in one place only, all your log files that accumulate over the years. It runs on Mac and Windows, and it is a commercial product.

DX Cluster spots represented in a google map, for 10m 6m 2m bands taken from the VE7CC DX Cluster. Some filtering options are available.

ICOM IC756 PRO II III, PS125 Fan Modifications, install an external cooling fan on the ICOM IC756 PROIII to minimize the heat on the chassis, then will perform a fan modification on the ICOM PS125 power supply to minimize the fan noise.

NOAA Satellite Signals With a PVC QFH Antenna and Laptop, this website also link to a github where you can find files and supporting documentation for constructing a QFH Antenna

A growing website dedicated to bringing you great accessories to use along with SDR, without breaking the bank. Worldwide shipping and fast dispatch

JSatTrak is a Satellite tracking program written in Java. It allows you to predict the position of any satellite in real time or in the past or future. It uses advanced SGP4/SDP4 algorithms developed by NASA/NORAD or customizable high precision solvers to propagate satellite orbits.

This page host a simple Windows program that will create an overlay for Google Earth that displays the Maidenhead grid. If you only need 4-character locator coverage, you can download an alternative ready-to-use kmz-file.

The folded dipole antenna or folded dipole aerial is widely used, not only on its own, but also as the driven element in other antennas like the Yagi antenna and various other types of antenna. Folded Dipole Myths, Bandwidth and details on folded dipoles

Learn Morse Online in 40 lessons with this web based morse code learning program, based on the Koch method. Choose the lesson, adjust the wanted parameters, and start the transmission of a set of random characters based on chosen lesson. Recognize the code and verify it at the end of the lesson.

The Quadrifilar Helical antenna provides circular polarization and complete hemispherical reception, which is precisely what is needed to receive the polar orbiting weather satellites, and as a 2 meter antenna it will receive horizontal, vertical and clockwise circular polarization.

This free PDF file contains two Worldwide grid square maps. The first map displays the fields (first two letters of a maidenhead locator) while the second includes also squares (third and fourth digit) and it can be useful to determine what is your ham radio grid square. PDF file can be enlarged and scaled to A3 and higher dimensions.

How do you practically conduct an RF exposure evaluation of your station? What information do you need and what values must you compute? What are the tools and techniques readily available to the casual operator to ensure compliance with the FCC regulations about RF exposure

Amateur Radio Ham Radio Maidenhead Grid Square Locator Map online. This map allows just a point and click to determine dynamically the correct six characters locator. Other functions allow to calculate the distances among two given locators, or coordinates. Hover over map, specify grid, or enter latitude and longitude to show grid and/or calculate distance. Map is powered by Bing Maps.

It is easy today to build a GPS tracking system for mobile applications that can be adapted to your needs. In fact, it is more accurate to speak of a GNSS (Global Navigation Satellite System) tracker, a term which encompasses the 4 positioning systems or satellite constellations.

Morse Code Decoder for Android based on the algorithms implemented in CW Skimmer. Morse Expert decodes Morse Code audio to text. It is optimized for decoding weak, fading signals in the presence of interference, especially on the Amateur Radio bands. The input audio might come either from the built-in microphone or from another device, such as a radio receiver.

A magnetic loop antenna designed for 14 MHz. This kind of antennas is also known as STL, small transmitting loop and can be an excellent solution when you are not allowed to put antennas on your roof

Remote SDR is a web application allowing to remotely control an amateur radio transceiver between 1 MHz and 6 GHZ. It allows processing of Adalm-Pluto SDR in addition to HackRF or RTL-SD Reception in NBFM, WBFM, AM in addition to SSB Transmission in NBFM or SSB and more

Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles

SDR control for FlexRadio Signature Series Rig for Apple Mac. FT8 integration, External Software support, Several additional Tools, display as many panadapters and slices your Radio is capable of.

DX Pedition to Galapagos will be active from October 26th to November 7th, from 6 to 160 meters (including Warc bands) on CW, SSB and Digi modes with at least 4 stations on the air at the same time.

Patents of most popular antenna models including Zeppelin Antenna, Beverage Antenna , Franklin Antenna , Yagi-Uda Antenna , Sterba Antenna , Rhombic Antenna , Turnstile Antenna , Folded Dipole Antenna , Coaxial Antenna , Slot Antenna , Discone Antenna , Quad Antenna Element , Log Periodic Antenna , Swiss Quad Antenna

TLV80 is model of a Top Loaded Vertical Antenna is doing a good job for DX on 80 m band. A version for 80m-30m is provided.

PDF document for IC-7300 beginners. The ICOM IC-7300 is an HF + 6 meter, multi-mode, self-contained Software Defined Radio (SDR) transceiver with knobs, buttons and a touch screen. It also has a real-time spectrum display with pan adapter and water fall displays.

These pricey battery-powered devices are the only type of generator that can be used indoors safely. The article reviews pro and cons of power stations evaluating runtime, power delivery, power quality, ease of use, and noise.

WSJT-X FT8 and the Icom 7300 the Easy Way. If you are looking for an easy way to try out the new WSJT-X FT8 mode, this article is for you

HAM-made engineering products supplies and produces coaxial relays, antenna switches, sequencers, roller inductors, variable capacitors, low noise preamplifiers, RF power rotary switches and coil bodies.

On this page, you will find one of my designs; An Audio Selection Panel (ASP). The Audio Selection Panel allows you to control 4 Transceivers and hear the audio through the built-in loudspeaker and on an external boomset (combination Microphone/ headset). On or more transceivers can be selected at a time to transmit and/ or receiv

A homemade 23 cm transverter project with several building steps and pictures

When building antennas for the Wifi band (Like the 8dBi omni), a need for an easy way to check the antennas arose. A Voltage Standing Wave Ratio (VSWR) meter useable at the 2.4GHz band is however, hard to find.

The Slim-Jim is a bit of a classic – building one is almost certainly a rite of passage and you will be glad that you did: It is easy to make, fairly easy to tune and rolls-up for transportation.