Search results

This site serves a community of volunteer and paid professionals in Search & Rescue and Civil Air Patrol who save lives and Amateur Radio enthusiasts who use DF skills as a hobby. We provide antennas and other resources for people in these fields.

How to receive images from orbiting noaa weather satellites using simple receiving equipment and a computer by G4ILO

A bycicle ham radio station setup, with full band coverage

An Offset Attenuator for fox hunts.

Hams with web cams database with net and roundtable information.

The RasHAWK team has used a Raspberry Pi as the basis for a networked RF sensor capable of supporting spectrum monitoring, signal intercept and direction finding (DF) operations.

A hombrew QRP transceiver for 40 meter band with many pictures, circuit and sound recording of some QSOs made with this Rig consisting of 5 transistor and one chip.

Chronicles technical discussions and operational queries related to various Yaesu amateur radio equipment, primarily from February 2004. Topics include troubleshooting the _FT-101E_ -100v circuit, questions about the FT-990, and inquiries regarding the _VX-7R_ service manual. Operators discuss issues like the FT-101's transmit problems, FT-1000D tuning knob behavior, and the FT-897's linear amplifier control. The archive also contains posts about specific components, such as the 2SC2652 RF power transistor, and requests for parts like FT-221R boards. Users share information on CAT interface cables for the FT-1000D and discuss features of handhelds like the VX-2R and VX-7R. This historical snapshot provides insights into common problems and user-driven solutions for Yaesu gear from that era. Several posts offer items for sale, including an FT-208R and an MD-1 desk microphone, alongside requests to buy specific transverters like the FTV-650B.

ZS6YI modifications for the Icom IC7000

In his back office section, ON4SKY, initiates in a few articles the beginners in the art of QSLing and award chasing.

A simple to build full length 20/40 dipole antenna to be used in inverted vee configuration

Learn morse code with morse machine, A Fully Automatic Morse Code Teaching Machine first described in a May 1977 QST. Free for Windows MacOS Linux and DOS

Repair & Restoration information in UK

Demonstrates various practical amateur radio projects and technical discussions through video episodes. One episode details cutting and retuning a _1/4 wave shorted stub_ from 101.7 MHz to 107.5 MHz to safeguard a transmitter's driver stage, alongside insights into advanced _160-meter antenna systems_ like eight-circle arrays and beverage antennas. Another segment covers upgrading firmware on an _ATS-20+_ receiver using AverDudes for improved display and functionality, and a detailed guide on using D-Star DR mode on an _ICOM ID-52A_ for international repeater programming. Additional content includes a deep dive into _OpenHamClock_ as a potential replacement for the HamClock project, updates on _Raspberry Pi 5_ running Trixie OS, and a review of the Choyong LC90 Internet radio with AI integration. The series also features "Ham College" episodes, which meticulously prepare viewers for the Technician Exam by covering topics such as antenna and transmission line measurements, SWR interpretation, and the functions of basic electronic components like rectifiers, relays, and transistors. Practical advice on coaxial cable characteristics, dummy loads, and proper soldering techniques is also provided.

The BP-3 was a valve-based spy radio transceiver, developed during WWII by Tadeusz Heftman of the Polish Military Wireless Unit in Stanmore (UK). It was introduced in 1943 and was intended for use by Agents and Resistance Organisations in Europe. The transmitter produces an output power of 50 Watts in CW

Electronics and Radio Today for electronics and radio information, projects parctical information and introductory articles. Especially useful for those taking GCSE Electronics in the UK and around the world.

Repair and Restoration Services in Orlando USA

Kenwood TS-450S/TS-690S MARS modification video

Includes W1BB Stew Perry letters, and a sample QSL cards of dated 1963

General article on Baluns at myantennas.com, what is a balun and when to use baluns

The Antique Radio Repair Center at For Your Listening Pleasure has been providing quality antique radioold zenith, zenith.gif repair and restorations for well over 20 years.

Use this online calculator to determine the length of a quarter-wave antenna from the frequency. Both metric and English units of measurement are supported.

HF Radio Contesting and personal information: Latest scores, station tour, DL contest records and large photo section, maps and software

Test equipment maker, digital oscilloscopes, generators and counters, multimeters, logic probes testers and more

A Ham Radio Newsletter dedicated to HF communications and the PACTOR user

A tutorial video on manual programming the Wouxun KG-UV8D handheld transceiver

Radio wave propagation, Principles of transmission lines, Antennas

PSK31 News, Contests, Information, Forum, and more Find a helpful community and information.

Heathkit SB-220 Amplifier modification by KE5YA

Toronto Surplus , antique radio, test equipment, rf parts

This page describes a cheap, weather-resistant and readily available type of antenna wire by HAMwaves.com

This project produces a sturdy tripod for small vertical antenna support using readily available electrical metal tubing (EMT) or conduit

Software Defined Radio manufacturer, SDR-IQ NetSDR SDR-IP and IF-2000

Telecom Product Profiles is a manufacturers' rep firm specializing in factory direct Nello Towers, monopoles, antenna mounts, shelters, and more. Factory direct Cellular, PCS, and Wireless Broadband equipment such as antennas, radios, and more. Installation, financing, and leasing options available.

Community blog at livrjournal

Scanning Paulding County, Georgia Sheriff, Fire, and EMS

Vanuatu - YJ 2010 - DXpedition info and online log

Look for free manuals (download) in amongst paid offerings for test equipment manuals. The freebies page also has mostly ham material. We do also sell major ham collections at pretty much close to our production and distribution costs.

Electronic surplus dealer with online catalog

The online review site that learns what questions that you need to focus on most. Focusing on amateur (ham) radio exams

FT-817 Radio Modifications, Improving the FT-817 Noise Blanker, increasing output power, using rechargeable cells, epanding frequency range

A trap on the coaxial cable, also known as choke, helps to eliminate the sneaking of the reflected RF- energy to the shack. The trap can be made from the coaxial cable that feeds the antenna

Protecting amateur radio equipment from transient overvoltages requires robust lightning and surge protection, which is the focus of Electronic Specialty Products. The company provides various devices, including coaxial lightning arrestors for antenna feedlines and surge protectors for AC power lines and data circuits. These devices are engineered to divert high-energy surges, such as those caused by direct or indirect lightning strikes, away from sensitive transceivers, amplifiers, and computer components, thereby preventing catastrophic damage. Key products include the _Coaxial Lightning Protector_ series, designed for various impedance levels and frequency ranges up to 3 GHz, and the _AC Line Surge Protector_ for shack power distribution. Effective deployment of these protection devices can significantly reduce the risk of equipment failure and ensure operational continuity during severe weather. For instance, a properly installed coaxial arrestor can handle peak currents of **20 kA**, while AC line protectors offer clamping voltages typically below 400V. Comparing different models reveals varying levels of insertion loss and return loss, with some coaxial units exhibiting less than 0.1 dB loss at 500 MHz, making them suitable for high-performance HF and VHF/UHF operations. Integrating these components into a comprehensive grounding system is crucial for achieving maximum protection against both common-mode and differential-mode surges.

Modification of the Bill Petlowany, K6NO antenna by N0LX

Free windows morse code learning program. Whether you want to learn Morse code from scratch, never having heard a dit in your life, or you just want to speed up your copy for CW contesting, CW Teacher will help

Over 4000 ham radio links

Crank-up(telescopic) and tilt-over tower, Ring rotator for mounting an extra antenna, from 16m to 42m, Strong safe and smooth, Radio communication and commercial tower.

Columbus Police Dispatch - Citywide Live Audio Feed

A conversion of a 80m dipole into a 160m vertical antenna