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G3KHZ, SM6CVX, G4EDG, DL6KVA + S21ED and S21TV will activate Bhola & St Martins island AS-140 AS-127

Solar and Heliospheric observatory

This page provides a list of scanner frequencies for hams in the UK. It offers a comprehensive guide for ham radio operators looking to find and tune into various frequencies for communication. The page is useful for hams who want to explore different channels and connect with fellow operators in the UK. Whether you are a beginner or an experienced ham radio enthusiast, this resource can help you discover new frequencies and expand your communication network.

YOTA Youngsters On the Air Facebook public group

Coastal Amateur Radio is for hams south of the Fraser. Even if you live north of the Fraser you are welcome to join in. Hams who come together for the love of HF & VHF in the hobby.

Mini-Operating Guide includes useful hints on Using the HM-133 Microphone, Basic Operation, Operating through a Repeater, Programming a Memory Channel and Assigning a Memory Channel to a Memory Bank

Hurricanes Katrina & Rita information from various sources. Compiled by KD5QEL Robin (New Orleans native) near Atlanta, GA. Not for chitchat--only for communications info.

Antennas for Amateur Radio and short wave listening

The vOICe Learning Edition can be used in combination with a regular oscilloscope, allowing blind users to hear any oscilloscope trace.

A micro-blog about micro-signals, mostly QRP

Technical Comments about Transmitter Intermodulation, Distortion, and ESSB (or Hi Fi Wide Fi SSB) audio or over equalization by W8JI

W1REI / DU1LWQ amateur radio station blog from California

An FCP is not magic. It has no gain. An FCP improves an antenna system by replacing more loss with less loss. Some have been able to erect better wires in the air because the small size of the FCP allowed better placement of the antenna.

KB0OXD amateur radio blog

Presentation of the QO-100 the first geostationary OSCAR from Qatar by AMSAT-DL

A Simple Serial and Sound-Card Interface for the Yaesu FT-857D using an FT232R USB-to-serial bridge chip.

The DIY 137 MHz WX SAT V-dipole antenna project details the construction of a specialized antenna for receiving weather satellite transmissions. It provides specific dimensions for the dipole elements, designed for optimal reception around the 137 MHz band, which is commonly used by NOAA and Meteor weather satellites. The resource outlines the materials required, such as aluminum tubing for elements and PVC for the support structure, along with the necessary coaxial cable and connectors. The article presents a clear, step-by-step assembly process, including how to form the V-shape and connect the feedline. It emphasizes practical considerations for mounting and weatherproofing the antenna for outdoor deployment. The design focuses on simplicity and effectiveness for amateur radio operators interested in satellite imagery. Key aspects include the precise angle of the V-dipole and the lengths of the radiating elements, which are critical for achieving the desired circular polarization response for satellite signals. The resource includes photographic documentation of the construction phases and the final mounted antenna.

The purpose of this blog is to help new hams and promote amateur radio

29 May to 4 June 2010, WFF comprehensive expedition in Kazakhstan-Zhetisu-2010 WFF expedition on national parks and wildlife reserve of Almaty oblast- Zhetisu-2010

Amplitude Modulation (AM) is essentially a mixing process where the audio modulating signal is mixed with the radio frequency carrier

Complete microphone wiring handbook for most popular radio transceivers provided by Astatic Microphones.

An online calculator for designing and evaluating capacitors based on the capacitor's area, separation, number, and dielectric constant

Master Callsign Database Editor allows to create and modify Super Check Partial database files used by many contesting programs in DTA and SCP formats. The files produced by Master Editor in DTA format can be used with CT, WriteLog, TRlog, SD, and others. The SCP versions of the produced files are for use with Win-Test, N1MM+, and others. Master Editor allows to create a callsign database from a separate log or from a set of logs in the Batch Import mode.

927.1250 MHz Santiago Peak, CA USA

Scandinavian Amateur Radio Teleprinter Group

Heinrich Hertz was the first to send and receive radio waves.

A review of the Alpha 87-A power amplifier by WD0M

Highlights the VE2CWQ amateur radio club, a key player in Quebec's emergency communication network and a member of the _RAQI_ federation. The club actively supports the _CANWARN_ program, providing crucial communication links during outages or natural disasters when traditional telecommunication infrastructure fails. Members are encouraged to monitor specific frequencies for vital updates and instructions during emergencies. The club maintains a repeater, VE2RAW, operating on **449.325 MHz** from Mont-Rougemont, ensuring reliable local coverage for its operations. VE2CWQ emphasizes the significant public service role of amateur radio beyond hobby, contributing to community safety and resilience.

A review of the Yaesu FT-8900r 29/50/144/430 MHz FM Transceiver, providing 50 Watts of power output on the 29/50/144 MHz Amateur bands, and 35 Watts on the 430 MHz band.

Shipping case and custom foam specialists

Over 500 different types of high-performance electronic cables are manufactured by Alpha Wire, catering to demanding industrial and commercial applications. Their product lines include the robust _XTRA GUARD_ series, designed for harsh environments, and a range of flexible coaxial cables optimized for signal integrity. These cables are critical components in amateur radio shacks, industrial control systems, and data communication networks, ensuring reliable power and signal transmission. The company provides extensive technical resources, including detailed product specifications, application notes, and RoHS certificates, accessible through their online resource center. Hams often utilize their wire and cable products for antenna construction, station wiring, and various DIY projects requiring durable and reliable conductors. Alpha Wire also offers tools like size guides and competitor cross-references, simplifying product selection. They emphasize continuous uptime solutions, reflecting their focus on quality and durability.

A home made RDF 3 elements Yagi that can be used for fox hunting. The particularity of this antenna is that it can be folded, in order to save space while travelling. In Dutch.

Encrypted messages, fancy technology, spies use them all to communicate, but sometimes the best way to hide is in plain sight. Right now, broadcasting across the airwaves around the world, are automated, anonymous shortwave AM radio stations that most governments won't acknowledge even exist, much less explain

A personal blog about amateur radio activities, including homebrew, bitx, ubitx, mcHF, JT65, FT8 and more digital communications.

RadioReference page on Radio Shack Pro-97

SARTG RTTY contest new year and WW-RTTY rules and results

Real-time solar activity page at SpaceWeatherLive.com display sunspot regions, indicating sunspot numbers of with manitude class, Solar Flares and a list of daily events on the sun.

Tektronix Frequency Counters pack the functionality of a frequency counter, meter and timer into one instrument.

Check out these vintage QSL cards from the 20th Century in this gallery of old QSL cards.

Grupo de radio emissao mensageiros da Paz

Online NOS electronic parts shop for QRP-QRPp radio constructors, to vintage radio and electrical measuring equipment restaurators. Many Germanium diodes, transistors and RF parts, semiconductors.

A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)

marine and weather station products

Electronic Products Design Inc based in North Carolina, offers you custom design of transformers, coils, and telemetry control systems.

Unlike older radios, the 706 uses only one crystal oscillator (called the Master Oscillator). All other frequencies in the radio (L.O., 3-4 I.F. stages, VFO, and CW-offset) are computer-derived from the Master Oscillator. This makes it relatively simple to frequency-align the radio, so that it agrees with the Frequency Display in all modes.

This article is about a homebrew 6 meter lightweight Moxon antenna. Article includes a full part list, instruction to assemble the parts and pictures.

DK7IH QRP transceiver for 14 MHz. This small and compact home made transceiver with a max power output of 5W, the VFO module is based on the clock oscillator chip Si5351A by Silicon Labs ATmega168 and OLED 1306

The Advanced ATV Repeater is probably the most versatile ATV repeater controller in The World. It can run entirely under the operating system or all repeater functions can be controlled from any other computer

CQ World Wide 160-Meter Contest rules, results records and log official web site.

A collection of 450 MHz Cheap Yagis that have proven great portable operations, back-packing and transmitter hunts, and are something inexpensive you can throw up in the attic for that weak repeater