Search results

Indonesian Awards

COTA-RUSSIA Award

What do Hams do? by Victor Amateur Radio Association

Fox Controller, designed by VE2JX and VE2EMM includes schematic diagram to build the transmitter.

This is a antenna tuner with wide range tuning for antennas with a Z of + 50 Ohms on all the HF bands.

Article on importance on correct procedure to calibrate your PC sound card for digital mode operations

Low-frequency (LF) radio time signals, operating primarily in the 40–80 kHz range, are broadcast by national physics laboratories for precise clock synchronization. Transmitters like **JJY** (40 kHz, 50 kW; 60 kHz, 50 kW), RTZ (50 kHz, 10 kW ERP), MSF (60 kHz, 15 kW ERP), WWVB (60 kHz, 50 kW ERP), RBU (66.66 kHz, 10 kW), and DCF77 (77.5 kHz, 50 kW) cover vast geographic areas, often several hundred to thousands of kilometers. LF signals offer distinct propagation advantages over higher-band transmissions such as GPS. Their long wavelengths (3–6 km) enable effective diffraction around obstacles like mountains and buildings. The ionosphere and ground act as a waveguide, eliminating the need for line-of-sight and allowing a single powerful station to cover extensive regions. Ground wave propagation minimizes ionospheric variability effects on transmission delay, and signals penetrate most building walls effectively. Robust and low-cost receivers, often priced at 20–30 USD/EUR, are widely used in radio clocks. These receivers typically comprise a tuned ferrite core antenna, a receiver IC (e.g., Atmel T4227, U4223B, MAS1016) for amplification and AM detection, and a microcontroller for decoding the time signal and phase-locking a local clock. Specific components for DCF77, MSF, and WWVB are readily available from vendors like HKW Elektronik and Ultralink.

The program sends morse code audio via sound card and can be used under Windows in Danish only

Zplots is an Excel application that allows you to plot impedance and related data obtained from a variety of sources. You can plot on both an XY chart and a Smith chart as well as view the data in tabular format. The XY chart can be customized with your choice of trace lines. Frequency (in MHz) is always shown on the X axis.

Article comparing the FT-8800 to the TM-D710

Western Canada YL amateur radio club

Plan a trip to the Ozarks and join all your radio buddies at one of the largest hamfests in Missouri. Over 20,000 sq-ft A/C indoors with over 200 flea market tables.

AVRS info by WB4APR

WW Locator grid square map and QTH locator made with google maps for ham radio

The Windom antenna, one of the oldest antennas developed for amateur use, has had a complicated history, one as interesting as the theory of the antenna itself.

A portable operation experience with a SpiderBeam pole during a contest, testing wire antennas, like dipole and delta loops configurations on 20 40 and 80 meters band.

On 28.219 Mhz it puts out a whopping 3.85 watts into an inverted V dipole at about 30 ft.

Extended Single SideBand is any SSB transmission that exceeds the audio bandwidth of common 2.9kHz SSB J3E modes by essb.us

A Java multiplatform application used to find EEPROM locations for different radio settings. a very simple to use multi-platform Java application which can be used to find EEPROM locations for different transceiver settings. This information can then be used to send the right CAT commands to configure the radio remotely. Use this application on your own risk.

Proper postal addressing ensures quick and efficient handling of your QSL

Online Log for 3C1L DX pedition powered by clublog

10 Meter Propagation Beacon OE3XAC

Smith Chart it is a graphic tool for solving transmission lines problems

A close up of Doppler Shift, a phenomenon which is commonly observed by the lay person, yet still confuses many amateur satellite operators.

A calibration kit useful when you need known reference impedances to properly calibrate your vector network analyzers.

A review of the MFJ-259B Antenna Analyser writtten by G3CWI

3C0W On-line Log for the 2018 Annobon DXPediton

Repairing a Cushcraft R7000 antenna featuring several problems, mostly concerning coils and the insulating parts of the antenna.

Remote Control Panel for ICOM IC-M710

Some basic tips for successful QSLing, in particular when utilizing the services of a QSL Manager by W5UE

This project is a full wavelength, horizontal, loop antenna for the 40 metre Amateur Radio band, built using insulated copper wire in a diamond shape, supported by egg insulators, tethered to 4 masts, each 6.5m high

Remembrance Day Contest Logger free Windows software. Remembrance Day is a popular contest in Australia.

Replica of David Sarnoff\'s Key, Marconi operator at Station WHI

A comparison of Elecraft KX2 and Yaesu FT-818

Virtual Signal/One Radio Museum

Search TY1TT on-line logbook 2014 dxpedition

VP2ERM will be operating from the Caribbean island of Anguilla between July 19 - August 3, 2014

The Baofeng UV-5R handheld transceiver, introduced around 2012, operates across the 2-meter (144-148 MHz) and 70-centimeter (420-450 MHz) amateur bands, offering dual-band receive and transmit capabilities. This review provides an early assessment of the radio's form factor, user interface, and general performance, noting its compact size and the inclusion of a **VFO/Memory mode** button for frequency management. The device supports both FM and narrow FM modes, with a reported power output of 4 watts on VHF and 3 watts on UHF, making it suitable for local simplex and repeater operations. Key features discussed include its 128-channel memory capacity, a built-in VOX function, and a **DTMF keypad** for tone dialing and repeater access. The review highlights the radio's ability to scan frequencies and memories, along with a dual-watch function allowing simultaneous monitoring of two frequencies. Battery life is addressed, with the standard 1800 mAh Li-ion pack providing several hours of operation depending on transmit usage. Initial impressions cover the radio's construction and the clarity of its LCD display, which shows both A and B band frequencies.

How to program Motorola APX Series P25 Two-Way Radios for use with the OpenSPOT 2. This document covers some important steps to be followed to upload the correct codeplug to mMtorola P25 radios

A Fox transmitter by VE2EMM with construction details part list and schematic diagram

Czech Castles Award is given to any amateur radio operator who can provide confirmation of contacts with radiostations from castles and fortresses in Czech Republic.

There are quite a few variants of the design accompanied with many opinions on the effectiveness of the antenna. This page features links to some similar projects and a homebrewed personalized version of this portable antenna tuner

Amateur Packet Reporting System (APRS) operations often require compact, reliable solutions for transmitting position data, particularly for mobile or portable stations. This resource details the construction of the _Tiny Track-I_, a transmit-only APRS tracker designed for straightforward integration with a VHF radio and a Global Positioning System (GPS) receiver. It enables hams to broadcast their location without the complexity of a full-duplex TNC. The project outlines the printed circuit board (PCB) layout and schematic, based on an original design by N6BG, with a personal PCB drawing by SV1BSX. It includes specific component placement and notes an additional 10uF/10V capacitor (C5) for improved IC voltage decoupling, a modification not present in the original N6BG diagram. The unit connects to a computer or GPS via a DB9 female connector. This tracker is ideal for basic position reporting, offering a simple and effective way to participate in APRS networks. Its small footprint makes it suitable for vehicle installations or field deployments where space is limited, providing a **reliable 9600 baud** data stream for location updates.

E44PM Palestine DX Pedition December 2011

Personal Page UR4IOR from Ukraine, with some nice personal photos.

VU2NAN Nandu's Crystal Radio Pages

IARU HF Contest, goal is to contact as many other amateurs, especially IARU member society HQ stations, around the world as possible using the 160, 80, 40, 20, 15 and 10 meter bands.

List of countries that have been worked from the Czech Republic on 50 MHz band since January 1, 1993

The TECLA Thirty, an early wireless age crystal set, is featured among a gallery of over 100 collectible headphones, with detailed close-up photos of vintage models. Several pages offer vintage headphones for sale, including Brandes, Baldwin, and Western Electric, suitable for crystal set use or collecting. Construction details are provided for a reproduction KILBOURNE AND CLARKE crystal set, built with vintage 1920s parts and featuring a miniature variable condenser for fine tuning. The resource also presents a project for a simple crystal radio and a 1-tube amplifier, complete with a schematic and component diagram, suitable for driving a horn speaker or amplifying weak signals for headphones. Instructions for mounting argentiferous galena detector crystals are included, along with information on MRL Handbooks covering crystal detectors and modern diodes. Additional projects include a 2A3 single-ended triode tube amplifier and two stereo tube amps using 12AX7, 6V6, 5Y3G, 6SN7, VT-25, and 5U4G tubes.

A page with several testing and measurement resources usefull for those ham radio operators who needs to align or repair their own radio equipment.