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At the moment the most used program is UA1AAF. It is an excellent program written by Boris, UA1AAF, to handle ARI International DX Contest. It can simulate K1EA or N6TR workings; it will be possible to connect the RTX to the computer using a standard interface in such a way as to transmit directly in CW from the keyboard; most of the controls are like K1EA's CT and N6TR's TR ; on line help provides almost all the information necessary for using the program. Is possible to insert QSO after the contest. An appropriate utility in included for conversion in ADIF format. The program is very small and therefore works without any problems on any IBM compatible computer with DOS 3.3 and over or Windows 95/98.

Magnetic Loop antenna for broadcasts band reception

A circuit which had been used in many other application before. The configuration described here is optimized for IPHONE/radio operation.

How atenna tuners works and what are real effects on feed lines and maximun power output by G3TXQ

Annual Cherryville Repeater Association Hamfest, North Hunterdon Regional H.S., Route 31 South, Clintion Twp USA

Amateur radio propagation studies (science, research, engineering, operating) and the BeamFinder propagation analysis software

Alford slot antenna for 1.3 GHz to 2.3 GHz.

DIY a Wi-FI Helical Antenna for better performances, a project by PA0HOO i Dutch end English

The Collins 516F-2 is a heavy-duty power supply for the KWM-2/2A transceivers and the 32S-1,2,3 series of Collins transmitters.

Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit. After that simulation has finished you can view the simulation results on a presentation page or window. Run on Linux.

The Quadlong antenna for the six meter band. This antenna feature a total gain of 6,4 dBd, F/B 21 dB and is also available in 70MHz version. Includes detailed pictures and plot diagrams.

The utility "NEC-2 for MMANA" is intended for calculation of antenna models made and optimized in program MMANA and for construction and simulation of antenna models using input language NEC-2 and based on MMANA models.

Simple circuit, with a simple push, transmit a memorized Cw messages

The HB9DHG Contest Calendar aggregates contest information, offering direct links to official rules and past results for various amateur radio competitions. It features a curated list of events, with a focus on HF and digital mode contests, ensuring that operators can quickly access relevant details for upcoming and historical events. The calendar is regularly updated to reflect the latest contest schedules and rule changes. Each entry typically includes the contest name, dates, and a direct link to the sponsoring organization's page, such as ARRL or DARC, where full regulations and scoring information are available. This resource streamlines the process of finding contest specifics, which is crucial for effective pre-contest planning and post-contest analysis. Validation and checking of contest information are emphasized, providing a reliable source for operators planning their contest activity throughout the year. The calendar supports both CW and SSB modes, alongside various digital modes.

Adjusting audio output of your soundcard to obtain a perfect PSK signal from your transmission. A project to help you tuning your PSK31 emission.

Accurately determining an antenna's feedpoint impedance is crucial for optimal performance, especially when experimenting with new designs or making adjustments. While SWR meters provide basic information, a full complex impedance measurement reveals the resistive and reactive components, which are essential for proper matching. Modern antenna analyzers, like the _Palstar ZM30_ or MFJ259B, simplify this task, but measurements taken through a transmission line require careful interpretation due to impedance transformation. This resource details a calibration method to precisely account for the effects of the feedline. It explains how a transmission line can significantly alter the measured impedance, illustrating this phenomenon with a Smith Chart example where an 80m antenna's [22 + j6] Ohms feedpoint impedance transforms to [82 + j45] Ohms after a 10m line. The guide demonstrates using a transmission line calculator applet, such as the one by W9CF, to reverse this transformation. It outlines the process of calibrating a specific length of RG174 coax, showing how an initial 26ft estimate was refined to **25.85ft** to accurately predict a known 22 Ohm load, significantly improving accuracy over uncalibrated results.

This circuit consists of microphone amplifier and a high pass filter. Suitable to improve signal readability.

10 Meter Beacon, 28.288 mhz Hurricane Uta USA

Repeaters available in or near Ridgecrest California, Amateur Radio License Examination Schedules

A 4 elements handitenna for 70 cm band. This is my version of the K5OE Handitenna. This one is a four Element instead of three, as I had less of a crunch on space than he did. The 1st three elements (Reflector, Driven Element, and Director 1) are the same dimensions as his were.

How to identify correct version of your TS-570

There is not a personal design on this page, just I've transfered useful notes from PHILIPS RF Bipolar Transistors - Data HandBook about BLY89C VHF Power transistor, which is very popular among Amateur Radio homebrewers

A very simple receiver project by PA2OHH

Personal Web Site of UX7CQ. Information about Ukraine. Old military radios collection. CW Straight Keys.

A SSB CW transceiver for six meters band with schematic and block diagram

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

Ham Radio community web site

Live streaming audio of the K7ICU repeater

Australia, Sydney Fire information and monitoring website, Live sydney radio fire stream.

This article describes a simple Inverted L antenna for the HF bands designed to work on 80m, 40m, 30m and 20m

KA9LXP's HF antenna mast page

Make your own loading coils for antenna projects using Caterpillar Grommet strips.

PCB for the DJ9BV Power Meter taken from DUBUS 3/87

Myths and basic truths on transmission lines

Approximately 800 x 600 resolution is recommended for optimal viewing of the _Connecticut Radio Society_ (W1CRS) website, which serves as a hub for active amateur radio operators. The site encourages participation in club activities, particularly emphasizing operating events and contests. It provides a digital presence for members and prospective members interested in local ham radio engagement. The society's focus includes general amateur radio operation and competitive contesting, aligning with its classification as a contest club. The resource is designed to foster community among hams in Connecticut, offering a point of contact for those seeking to engage with fellow operators and participate in organized radio events. The club's callsign, W1CRS, is prominently featured, signifying its identity within the amateur radio community.

A magnetic longwire unun with a T130-2 Iron Powder core by M0UKD

Association with free membership for telegraphy lovers across the world.

conversion of low band VHF Philips FM-828 E band down to 6 metres

Battery problem with TS-570

Ham Radio Class On-Line. A complete On-Line Course for the Technician, General or Extra Class amateur radio license.

W0IPL experiences with Ten-Tec Jupiter

A power line noise eliminator designed to eliminate QRN expecially on 40 meters band.

An easy portable VHF antenna to build for ARES - RACES work is the 300 Ohm Twin Lead JPole antenna

This little project will make a portable 28 Volt DC power supply using two 12 Volt, 4.5 Ah rechargeable lead-acid batteries

Calculate power loss depending on coax cable you use

a methodology for connecting multiple LF/MF/HF receivers to a single antenna via readily available and inexpensive 75-ohm TV cable.

This page describes a DC to DC voltage converter, pretty simple, for currents up to 500 mA by sv1bsx

The GM4JMU Shortened 7Mhz Dipole

3 band mobile antenna - 10m full size wave/4 whip - quick tilt-down system for 20 and 15 m loading coil change by IZ7DJR

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.