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Schematic diagram for the Kenwood KPG 46 programming cable interface for Kenwood TM 271E TK 71 TK 81 TK 7302 NX 700 NX 800 series

Online professional-grade high-frequency (3-30 MHz) propagation predictions

Comprehensive guide to understanding of solar indices, reading this article you will allow a better understanding and interpretation of propagation forecast bulletins and propagation reports

CTCSS Decoder and Encoder, DTMF Decoder projects

Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes

80M field expedient antenna, suitable for NVIS operations

Schematic of a regulated 0-24v 2A Power Supply

Yaesu FT-847 (FT 847 FT847) transceivers mods reviews software manuals and diagrams

On-line log for 3XY1T Guinea DX Pedition 2016

Chip64 mp3 file

Italian magazine mainly dedicated to homebrew and parts

The rhombic antenna is a diamond-shaped antenna, suspended between 4 masts.

Comparing the TH-F7E with the Icom IC-E90

One of the most useful antennas in the repertoire is the Marconi or quarter wave grounded vertical antenna. Its invention made it possible to halve the length of antennas, simplifying communications, especially at HF and below.

This article documents the modification of 2 types of Hewlett Packard switching power supplies to enable their use as power sources for ham radio equipment

These instructions use simple, generally familiar examples of equipment types and are designed to help you find the adjustment that suits you best. If you are looking on how to adjust a morse key, bencher key, paddle or straight morse key, here you will find all instructions.

Article about homebrewing a G5RV antenna by KC6CFF

An old post by John Doty about effects of noise in longwire antenna.

How to build your own beverage antenna for 80-160 meters band by K5ZD

Free memory management software for the Yaesu FT-991 and FT-991A models. It runs only on Windows 7, 8, 8.1, 10 both 32 and 64 bits, it also permits basic remote control features and allow backup and restore settings and memories. Documentation in mainly in French.

From Wikipedia, the free encyclopedia

An interesting article by K3DAV comparing the COMET CHA250B to other HF multiband vertical antennas

Double Bazooka Antenna, a simple coax based and broad band antenna you can easily build

Original drawing and design of a 4 and 7 elements yagi antenna for 50 Mhz

Search the J5T Log online DX Pedition to Guinea Bissau 2017

This 4m Slim Jim Antenna is cheap and easy to build yet it greatly out performs the more usual dipole due to its low angle of radiation. An SWR of 1:1 is obtainable across the 4m ham radio FM band with a simple adjustment.

Design for a 5 element 2 Metre beam with a forward gain of 8dBD and a front to back ratio of over 24dB.

Wikipedia page about regenerative circuits in designing receivers.

how to make a gamma match for a antenna. The Gamma match is the most used matching device used for yagi beams.

Operating in the Nordic region often requires specific call sign lookup tools, and this resource offers a dedicated search service for Swedish amateur radio operators. Users can query the database by entering a call sign, a family name, or a city, facilitating the identification of hams within Sweden. This functionality is particularly useful for DXers attempting to confirm contacts or for local hams seeking to connect with others in their area, leveraging the official data provided by the Swedish Amateur Radio Society (_SSA_). Such a lookup service streamlines the process of verifying contacts for awards like _DXCC_ or for general QSLing purposes. While many global callbooks exist, a national service like this often provides more granular and up-to-date information for its specific region. The ability to search by city can be especially beneficial for local rag-chewing or for coordinating activities within a specific geographic area, offering a practical complement to broader international databases.

Live audio feed from Denver Colorado Police

ham.dmz.ro FT1000 pages

A portable amateur radio station which the radio amateur can take when asked to go to an event which needs support with radio communication.

A Slinky-based doublet or loaded vertical QRP antenna tested for 40 meters band

Wikipedia page dedicated to the popular Yaesu VX-2R transceiver, include informations on modification.

Single Coax Feed to Multi-Band Copper Cactus Antenna.

Dimensions for the inverted V antenna from 160 to 2 meters by N6JSX

Yaesu FT-1000MP Mark V Field review by W4TI

A 4 AMP / 18V regulated power supply schematic, designed by _ON6MU_, provides a detailed circuit diagram for constructing a robust power source. The design focuses on delivering a stable 18-volt output at up to 4 amperes, crucial for powering various amateur radio equipment. This resource presents a clear visual representation of component interconnections, including rectifiers, filter capacitors, and voltage regulation stages, essential for DIY enthusiasts building their shack infrastructure. The schematic's clarity facilitates understanding the power flow and component roles within the circuit. This circuit design offers a practical solution for hams needing a reliable 18V supply, potentially useful for driving specific transceivers, amplifiers, or accessory circuits. While specific performance measurements or comparisons to other designs are not detailed, the schematic itself serves as a foundational blueprint. Builders can adapt or modify the _power supply_ to suit their particular needs, such as integrating overcurrent protection or fine-tuning the output voltage with adjustable regulators. The straightforward presentation makes it accessible for those with basic electronics knowledge to assemble and troubleshoot.

Rutherford County Sheriff and Fire Live Scanner Audio Feed on RadioReference.com

Presents _HamQTH_, a free online callbook and callsign server, which provides rapid XML access for various logging programs, enabling seamless integration for amateur radio operators. The service includes features such as recent activity logs, propagation predictions, and support for multiple languages, making it a versatile tool for DXers and contesters. It also offers detailed information on callsigns, including US states, counties, IOTA, WAZ, and ITU zones. Users can leverage _HamQTH_ for efficient log searching and to monitor current band conditions, aiding in planning DX operations and contest strategies. The platform's XML interface facilitates automated lookups, streamlining the process of identifying stations and gathering essential QTH data. Petr Hlozek, OK2CQR, developed this resource, reflecting practical experience in amateur radio data management.

Microphone wiring for Yaesu FT-757 GX II

SWR Graphing Software for Amateur Radio by KD4UDY, shareware

The official site of the 1997 BS7H DXpedition to Huang Yan Dao (a.k.a. Scarborough Reef).

Antartica 2006

The Remote Control Antenna Switch consists of two circuit boards. The control unit and the remotely controlled switch

Measurements for building a full wave loop using wire

The 3Y0K Log Online provides a detailed logsearch interface for the **3Y0K** DXpedition to Bouvet Island, scheduled for February 2026. This web-based tool, hosted on _Club Log_, allows users to access real-time QSO statistics and leaderboards. The interface includes interactive features such as a map for checking real-time propagation and colored boxes that reveal mode and time breakdowns when hovered over. The service supports HF bands and provides a structured overview of QSOs, including band/mode breakdowns and continent-specific data. Users can report logging inquiries and QSL requests exclusively through the M0OXO Online QSL Request System (**OQRS**). The site also offers additional resources like band plans, operating practices, and FT8 advice. The leaderboard feature, which includes clubs and Contest Club, ranks stations based on the number of band slots worked, with duplicate QSOs being discouraged. The expedition's impact on users' totals is also tracked, providing insights into new bands, modes, and DXCC entities worked. DXZone Focus: 3Y0K DXpedition | Club Log | Bouvet Island

Competent all-around 2-meter mobile transceiver, review by W4TI