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Serving the Community and Amateur Radio for over 50 Years

Putting the X7 at Science Festival 2004

A non profit organisation run entirely by volunteers to promote Low Power Radio.

High Performance Communications Receiver AKA, The Progressive Receiver

The understanding of the A and K indexes will become a very important issue when one begins serious HF operation.

Designing and constructing a two-element receiving loop antenna array for HF operation involves specific considerations for achieving high directivity and noise reduction. This resource details a homebrew system comprising two 30-inch diamond-shaped loops, spaced 20 feet apart, which are fed through mast-mounted preamplifiers and passive signal combiners. The operational principle relies on adjusting phase delays between elements via precise _Belden 8241_ coaxial cable lengths, optimized for specific bands from 160m to 20m. Performance data, derived from _EZ-NEC_ modeling, illustrates consistent 90° azimuth-plane beamwidth and low take-off angles across the target bands, with _Receiving Directivity Factor_ (RDF) values comparable to a 300-foot Beverage antenna. The article presents detailed elevation and azimuth plots for 20m, 30m, 40m, 80m, and 160m, demonstrating the array's ability to provide strong response at low DX angles while also supporting _NVIS_ signals. Key components like the _DX Engineering RPA-1_ preamplifier and _DXE RSC-2_ signal combiner are discussed, alongside the importance of impedance matching to preserve antenna patterns. The construction emphasizes self-contained elements that do not require ground radials, offering a compact solution suitable for suburban environments and stealth installations, with a focus on optimizing receive performance independently from transmit antennas.

The International Lighthouse/Lightship Weekend (ILLW) is an annual amateur radio operating event, typically held on the third full weekend in August, spanning **48 hours**. Originating in 1998 as the _Scottish Northern Lights Award_ by the Ayr Amateur Radio Group, the ILLW has evolved into a major international event. It encourages amateur radio operators to activate stations from lighthouses and lightships worldwide, fostering contacts and promoting maritime heritage. The event is characterized by its minimal rules, making it accessible and enjoyable for participants without the competitive pressure of traditional contests. Over 500 lighthouse entries from more than **40 countries** participate annually, contributing to August becoming recognized as "Lighthouse Month" within the amateur radio community. Unlike typical contests, the ILLW emphasizes participation and enjoyment over scoring or prizes for high contact counts. The site provides registration forms, entrant lists for upcoming years like 2026 and 2027, and reports from previous events, alongside historical context for the ILLW and related lighthouse activities such as the US National Lighthouse Week and the International Lighthouse Heritage Weekend.

Serving Akron, Ohio, Summit County and the surrounding area since 1981

How-to decode and Display APRS Packets from WebSDR Audio using linux computer

VHF Yagi antennas with low Q, extending the boom.

The Saratoga Amateur Radio Association provides emergency communications for the City of Saratoga, and promotes amateur radio in the community.

KF6SPI Technical blog, audio, hifi, car and ham radio topics

24915 KHz 12 mtrs band from JN63KR

A DIY aluminium push up mast project. The final mast includes 7 aluminium tubes with 6 cable clamps

The Badger Contesters is a club of like-minded hams who are interested in VHF/UHF/SHF weak signal communications. Our geographic focus is Wisconsin, however hams in Northern Illinois, Michigan's UP, and Eastern Minnesota are welcome to join us.

Capri island EU 31 iota referens

An online multiple calculator of 16 impedance matching networks

Bruce K1XR Collins Radio Collection pages

Information about Starved Rock Radio Club and PRINCETON HamFest

Iambic and Straight key amateur ham radio CW Morse code practice oscillators for Android. This Android app gives you both straight and iambic CW Morse code practice key oscillators. Each key translates Morse code into English and CW prosigns in real time as you practice. Practice sending Morse code with a straight key oscillator. Settings include WPM, show/hide Morse code/text, choose sidetone 400Hz-800Hz. Adjust the WPM so that you can produce well formed DITs and DAHs at a comfortable speed.

K2Net is a remote operation windows software for the Elecraft K2, and allow remote control over internet or wi-fi networks by G4ILO

A multi band antenna for HF band capable to operate from 10 to 80 meters band depending on wire lenght loaded with a small inductance neat the feed end.

Running 150 mW by OK0EN

Users review for the Kenwood TS-450S

This project is a USB Audio, Serial and PTT interface for rigs that does not directly support digital modes provided by applications such as FLDIGI, WSJT-X and JS8CALL. Plug these interface devices into your Windows or Linux laptop or Raspbian Raspberry Pi and you can send and receive digital tones to/from your rig and automate the frequency and mode control and PTT control.

Demonstrates the construction of a high-power 6-meter (50 MHz) amplifier, specifically designed for demanding modes like EME, TEP, and multiskip Es. It details the use of a _GU-43B_ tetrode in a grounded-cathode configuration, emphasizing the need for stabilized grid voltage and input capacitance compensation. The resource provides a comprehensive schematic, power supply design, and practical considerations for component sourcing, particularly for high-voltage and high-current sections. The builder achieved an output power of **1250 watts** with an anode current of 0.65 amperes and 3200 volts anode voltage. The article also covers the physical construction within a modified P6-31 enclosure, outlining the internal layout for RF and power supply sections, and includes photos of the completed unit. It highlights critical safety precautions for working with high voltages and reactive currents up to **20 Amperes** in the P-network.

eHam reviews about Cushcraft X7 yagi antenna

A homebrew radio transmitter project, based and inspired by the original 30 Watts input on 80 50 and 15 meters band transmitter by W11CP

New PA stage for good old Atlas 350XL HF transceiver

There are some aspects in regards to mailing QSL letters to Russia which you should know

Map of Argentina Locators

A group of Treasure Valley Hams have formed a group that is interested in experimenting with ballooning and using Amateur Radio and APRS to further our knowledge in communications.

Reviews Summary for Cushcraft A3S at eham.net

The antenna described in this article is for 50 MHz, but the design can be scaled for any band, including VHF, UHF, or even the higher HF bands. The antenna is nothing more than a square loop of wire, approximately 30" (or ~76cm) per side. The loop is fed in the middle of one side, and the opposite side to the feed point has a gap in it.

How to convert the ICOM VHD base station IC-275D to 275H 100W 144-148Mhz

Phased Spaced Active Whips and Broadband Loops by WA1ION

This calculator ask as input diameter, lenght turn and frequencu and will return L and Q

Table reference for serial ports commands supported by TM-D700A

This site is basically for the begeners (SWL) of india. This site is supporting to digital communication for hams also.

Ham radio club in Bryan Texas

Amateur Radio Coaxial Antennas by G3TXQ

Operating NVIS mode, understanding operation frequencies, choosing the proper antenna to operate with the Near Vertical Incidence Skywave propagation

Membership of the Society is open to anyone from Swansea or the surrounding area with an interest in Amateur Radio.

Missouri USA

Tuned circuits for Progressive Receivers

BPQ32 allows a computer running under Microsoft Windows to act as a Node in a NET/ROM compatible AX25 network, and to support a multiuser Mailbox, or other similar applications.

EA5FSC Home page.

A collection of projects and equiment home made for 24 GHz operations