Search results

Have you problem with your RG cables ? This page describes a smart antenna box using an RG-cathode for 3 antennas. The remote control needs just a simple wire and the GND for remote-control

IC7100BKT is a free program to control the Icom IC-7100 transceiver for MS Windows, available in free version with limited functions and full donationware version.

A remotely tuned 80m to 10m wire vertical antenna

This document describes the DIFFERENCE of mode HAM to the official broadcast DRM standard

A new look at the Ufer ground system by Chris Scott

The HamCall.net database offers a detailed listing of amateur radio callsign divisions, organized by prefix, which is crucial for DXers and contesters to quickly identify the geographical origin of a station. Each entry includes a specific callsign prefix, the total count of callsigns registered under that prefix, and the associated DXCC country or entity, such as "AL9Z 43203 USA" or "3AOH9MM 237 MONACO." This structured data allows operators to rapidly ascertain the DXCC entity for a given callsign, aiding in QSL verification and award tracking. This information is particularly useful for confirming rare DX entities during contests or for logging contacts for awards like DXCC. For example, an operator hearing a "3Y0C" callsign can immediately identify it as Bouvet Island, a highly sought-after entity. The inclusion of callsign counts provides a sense of the activity level within each prefix, which can be helpful for anticipating pile-ups or assessing the likelihood of making a contact. The data presented reflects a snapshot of the HamCall database, offering practical insights into global amateur radio demographics.

Download free skins for PowerSDR, a SDR client appliction. Skins provided by W1AEX

Plans and hex code for an RF wattmeter based on an Analog Devices AD8307 log amplifier.

The NCDXF/IARU International Beacon Project operates a worldwide network of 18 high-frequency radio beacons, continuously transmitting on 14.100, 18.110, 21.150, 24.930, and 28.200 MHz. These beacons, initially launched in 1979 with a single station and expanded to the current 18-beacon system in 1995, provide reliable signals for both amateur and commercial users to assess current **ionospheric propagation** conditions. The system's design, construction, and operation are managed by volunteers, covering hardware and shipping costs. The resource details the evolution of the beacon network, including the transition from Kenwood TS-50s transmitters to Icom IC-7200 radios with a new controller design implemented in 2015. It explains how listening for these 100-watt signals, transmitted to vertical antennas, allows operators to determine band openings and optimal propagation paths globally. The content also references three QST articles providing historical context and technical specifics of the beacon project. Practical information includes methods for identifying transmitting beacons via a schedule or specialized software like FAROS and Skimmer, which integrates with the **Reverse Beacon Network** for automated monitoring.

Maker of QRP Kits, QRP CW receiver and transmitters, audio CW Filters, antenna tuners, dummy loads, and morse code practice oscillator

One another useful Table for the HAM's practice.

A 27-28 Mhz quad loop antenna by Bernard Mourot F6BCU in french

An interesting project of the popular IW3HEV antenna analyzer in and embedded solution by PA3CKR.

Promoting interest in DX to the state of Arkansas and the world.

A Unique VHF Antenna with gain over a J-Pole Jose I. Calderon, DU1ANV

Homebrew a 2 meter square dipole antenna

Article about types of materials that make the best earth grounding systems

WRAASE Slow-Scan-Television (SSTV) commercial windows software, need an external hardware, SC-4 to work.

Italian page about a home made a 1 to 40 balun with pictures and measurements on HF bands.

40 meters band 5 watts transmitter, uses a 6L6 with a 6X5 rectifier and a 0D3 voltage regulator tube on the screen.

Demonstrates the construction of a 144 MHz turnstile antenna, detailing its design for omnidirectional, horizontally polarized VHF operation. The resource outlines the physical dimensions and materials required, including specific lengths for the radiating elements and the use of _RG-58_ coaxial cable for phasing. It covers the assembly process, emphasizing the critical spacing and connection points to achieve the desired radiation pattern and impedance matching for the _2-meter band_. The article presents measured _SWR_ performance across the 144-146 MHz segment, showing a low SWR of 1.2:1 at 144.5 MHz, which is suitable for general VHF use. It compares the turnstile's performance to a 9-element Yagi, noting the turnstile's advantage in providing consistent signal strength from all directions without requiring a rotator. Practical application for local FM simplex and repeater operations is implied, offering a simple yet effective antenna solution for fixed or portable stations.

Clandestine radios, cluster beacons and dx stations recordedd by AA5TB

A nice loop antenna project for 28 MHz with schematic diagram, construction details and a complete video instruction

A Loop Fed Array Yagi antenna for 50 MHz featuring 11 dBi gain and 23 f/b ratio. In this excellent page the author even includes a detailed drawing in DWG format, with element lenght and spacing measures, in a separa file a full list of material list needed to build this yagi antenna including source and price, the EZnec file for this antenna plan, and a lot of pictures of this LFA Yagi for 50 Mhz. A ten page PDF file containing all infos, is also available to download.

Kenwood TS-590S remote control software

OZ2OE Technical Home Page - Building a circular polarized yagi

A 40 meter NVIS beam antenna by W4NVK

Get on SSTV FAST with this quick tip quide. All the info you need to get started quickly.

A guide on writing reports to broadcasting stations and obtaining QSL cards

This map is done by Mike, KB8SSH

This program uses a Z-World Micro-g2b board to control up to 4 rotors.

Official Kenwood page about the TS-50 HF Transceiver

Definition of radio frequency bands, hf vhf uhf etc.

Crystal-controlled QRP tranceiver by F6BCU for 80 meters band 1W output

A simple and awesome wire monoband antenna, very usefull for portable and dxpeditions usage, consist of two elements, a driver and the reflector. This endfed halfwave gives a very low take off angle and is very suited for chasing DX.

High Gain Wi-fi Helical Antenna by AB9IL

A homebrewed antenna for 2m handheld radios by TB1BIG

Presents a curated collection of newsletters dedicated to _Earth-Moon-Earth_ (EME) communications, primarily focusing on the 432 MHz band and higher microwave frequencies. The resource details various EME DX experiences and news contributions from operators like K2UYH (W6/PA0ZN), offering insights into successful moonbounce contacts and operational strategies. It serves as an archive of specialized content for those engaged in or interested in extreme weak-signal propagation via the moon. The newsletters provide practical information on achieving EME contacts, often including details on station setups, antenna arrays, and signal reports from challenging DX. For instance, operators might report achieving contacts over **750,000 km** round trip, demonstrating the feasibility of long-distance communication on UHF and microwave bands. The content differentiates itself by concentrating on the unique technical and operational aspects of EME, which contrasts significantly with terrestrial DXing, providing a specialized knowledge base for advanced amateur radio operators.

Includes some schematic diagrams

A resurrection of some homebrew projects from our vintage years and the NorCal-sponsored project series in tribute to Doug DeMaw, W1FB

G0KYA Moxon antenna for 2 meters band

Notes on Icom IC-756Pro II and IC-746Pro by I0GEJ

The MicroBeacon is the combination of a memory keyer and controllable RF attenuator.

This table gives the minute and second of the start of the first transmission within the hour for each beacon on each frequency.

VR-5000 FAQs found on usenet and other sites

A good overview article on power supplies by Karl Shoemaker AK2O of the Spokane Repeater Group

Raising large Yagi antennas can be a challenging project. A trolley system will make the job a lot easier

KJ4WLH homemade dipole for 50 Mhz

An online J-Pole antenna calculator that need just to input the frequency and calculates in inch size of each element

Include 6W2SC Online log