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IC8POF's How To index, Hamradio mods, Crazy PA Tuner project (transform any manual amplifier in an automatic one).

Picture and reference links for STL Small tumed loops antennas by DJ3TZ

A PIC based morse code decoder circuit

10.100 - 10.140 MHz 3 Watts output by 7n3wvm

Over 100 amateur radio beacon audio files are presented, offering a direct auditory experience of propagation conditions across a wide spectrum of frequencies, from 1.8 MHz to 47 GHz. These recordings, primarily captured by IW3FZQ and IK3NWX, document signals from beacons such as DK0WCY, IY4M, GB3RAL, and S55ZRS, providing a valuable resource for **propagation study** and **beacon monitoring**. Each entry in the list specifies the beacon's callsign, its operating frequency in kHz, and the recording operator. This compilation includes signals from beacons located in various grid squares like JN55VF, JO44VQ, and IO91IN, illustrating diverse geographical origins. The frequencies covered span the 160m, 80m, 40m, 30m, 20m, 17m, 15m, 12m, 10m, 6m, 4m, 2m, 70cm, 23cm, 6cm, 3cm, 1.2cm, and 6mm amateur bands. Users can listen to these recordings to identify characteristic beacon tones and observe signal strength variations. The resource also invites other radio amateurs to contribute their own beacon audio files, fostering a collaborative archive of propagation data. The last update to this collection was on March 24, 2009, indicating a historical snapshot of beacon activity. Accessing the files requires the Real Player software.

In this experiment the autor is going to explore the use of a 1:64 matching network on the End Fed Long Wire Antenna. Experiment will consist in build a 80-40-20-15-10 meter End Fed Long Wire Antenna with a 1:64 matching network from the documentation available on the internet

A portable three element 6M yagi for less than twenty pounds

Articles for amateur radio newsletters aimed at new hams by WD4BIS

A system designed to automatically tune small transmitting magnetic loop antennas, particularly beneficial for **contest operations** where rapid frequency changes are common. The core of the system involves a PC-based control application, AutoCap, written in C#, which monitors antenna SWR via an external meter and commands a motor interface to adjust the loop's variable capacitor. The software is compatible with Windows and Linux via the Mono framework, offering a graphical user interface for monitoring system status, SWR, power, and motor commands. Key components include one or more magnetic loop antennas equipped with DC or stepper motors for capacitor adjustment, an SWR meter with data output (such as the Telepost LP-100A or a homebrew serial/USB SWR meter), the AutoCap PC software, and a motor interface. The most effective motor interface utilizes an **Arduino-based controller** with custom firmware, providing precise control over both simple DC motors and stepper motors, and supporting features like motor braking for finer adjustments. The system allows for configurable SWR thresholds, pulse widths, and motor effort settings to optimize tuning speed and resolution. Optional radio integration provides frequency hints, enabling the algorithm to learn the relationship between motor actions and resonant frequency, thereby speeding up initial tuning responses. The software also supports antenna profiles, allowing operators to save and recall specific configurations for different loops, including accumulated frequency hint data.

A complete test report on Icom IC-7851 obtained with some lab tests, in a 21 pages pdf file.

Many Hams suffer from a cruel obsessive-compulsive disorder. They're driven to achieve the lowest possible SWR even when it is not necessary by WB8IMY

Kenwood TH-D7(G) and TH-D7A commands reference

Friends keeping in touch via amateur radio and RV's

Shortwave listeners and amateur radio operators interested in _numbers stations_ can engage with this mailing list, which serves as a platform for discussing the enigmatic transmissions. The resource facilitates the exchange of information regarding these unusual broadcasts, often associated with intelligence agencies, by allowing members to share observations, decode attempts, and theories. It provides a community space for those who monitor the HF spectrum for these unique, often automated, voice or digital signals. Participation on the list enables members to contribute to a collective understanding of numbers station activity, including changes in frequencies, broadcast schedules, and message formats. While specific technical analysis or signal processing techniques are discussed by members, the primary function is information sharing. The list is administered by csmolinski at blackcatsystems.com, and prior postings are archived for reference, allowing new members to review historical discussions and data.

PetitTrack is a satellite tracker for the Sharp Zaurus SL-5x00 Linux PDAs. PetitTrack is based on the keplerian propagator algorithm used in kd2bd's Predict software.

Article by G4AON about a 4 and 2 Element Quad Antennas for the 6m band

We are the Radiating Element of the tri-state area composed of South Dakota, Iowa, and Minnesota.

eham reviews of the Yaesu FT-9000

Amateur Radio club for International Falls and surrounding area.

VHF UHF SHF Toplist including DXCC and EME-Initials

On these pages you will find articles and pictures reagarding a renewed Drake TR7 by DK4DDS

A four part article anout a digital rotator controller made with Arduino

Vertical phased antenna systems plans by G3WZT

The Northern Greece Contest Team (NGCT)official home page

A 2 element 40 meters band parasitic delta loop antenna project with pictures and details

A relaxed meeting place for hams and their families , set in a resort environment with all the desired ham radio facilities. Keningau Sabah East Malaysia

The NG7M Web Cluster, maintained by W7CT and NG7M, offers real-time DX spotting information crucial for amateur radio operators engaged in DXing and contesting activities. This service aggregates DX spots from various sources, presenting them in a user-friendly format accessible via both web interface and traditional telnet protocols. Operators can monitor band conditions, identify rare DX entities, and track propagation paths across multiple amateur radio bands. This cluster supports a wide range of operating modes and bands, facilitating efficient station operation for both casual DX chasers and serious contesters. The system integrates data from the Reverse Beacon Network (RBN) and PSK Reporter, enhancing its utility by providing automated CW and digital mode spots alongside manually entered voice spots. Access methods include a direct web interface for graphical display and a telnet connection for command-line interaction, catering to different operational preferences. The cluster's data stream is continuously updated, ensuring timely information for making critical operating decisions.

Offer various contest logging programs, for scandinavian contests, SPDX, PAXX, OK/OM Contests, IARU VHF Contest, Portugal Day DX contests, HSC contest, various polish and norwegian local contests and other utilities

In this page show interest information on Ham Radio in Honduras.

Wiring the PK-232MBX to the Yaesu FT-1000MP or FT-990

This is a page designed to help the EMCOMM operator thinking of going portable. It will describe a way of having VHF UHF HF voice and digital in one box

DXpedition to Pitcairn Island in January 2000 to celebrate OH2BR 40 year long Amateur Radio career

A home page about CW and QRP.

Magnetic Loop Antennas for The Radio Operator with Limited Space, a two part series of articles on how to construct a magnetic loop antenna, including directions on selecting high voltage tuning capacitor

KU6S SBARA South Bay Amateur Radio Association

Yagi with 5 Elements on 2 m, 8 Elements on 70cm and one Feedpoint by DK7ZB

Types of coax-cable with rf attenuator calculator, line loss calculator form includes an antenna gain calculator. This coax loss calculator can help you on choosing the right cable for your antenna sysmte.

End-Fed Half Wave matching unit project, based on a FT140-43 with SWR plot tests made using capacitor and without.

First Amateur Radio contest club to be organized in the state of Florida

Aduino-based Amateur Radio Antenna Rotator Controller that can emulate the Yaesu GS-232A or GS-232B interface by K3NG

ZL9CI, 1999 DXpedition to Campbell Island

DX Cluster server software by F5MZN

Dedicated to the RTTY contesters worldwide by DK3VN, contest rules and summaries,

The 2000 CQ WW Multi-Multi operation by the GM0B contest group from Benbecula, Outer Hebrides, Scotland, is documented, providing insights into a significant **DX contest** effort. This resource outlines the station setup, operational strategies, and team composition for a large-scale, multi-operator, multi-transmitter entry. It details the logistical challenges and technical solutions employed to achieve competitive results from a remote island location, a common scenario for **DXpedition**-style contest operations. The page offers a glimpse into the practical application of contest rules and the coordination required for a successful multi-operator effort. It serves as a historical record of the GM0B team's performance in a major international contest, allowing other contesters to compare operational approaches and understand the scale of such an undertaking. The information can be useful for those planning similar contest expeditions or studying past contest strategies.

Magnetic Loop Antenna for 20/15m with Remote Tuning by George Szymanski

Coordinamento del radioascolto``Official website, in italian

CAT (Computer Aided Tuning) connects computers with ham radio. Yaesu FT-890 intercace and ICOM IC-Q7 schematics by DK7IN

Packet radio applications by Luis Fdo. y Jose Carlos Ramirez, EB7CJO in Spanish

Kenwood TS-480HX Resources at eham.net