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Build An Offset Attenuator by Joe Moell K0OV as featured in Homing In for May 1998

This group has been created to promote discussion relating to the EH Antenna. There should be many with experience with the EH Antenna, so don't be shy about asking questions on construction and efficiency.

AOR USA Web site, manufacturer of base and mobile receivers, handheld receivers, digital voice modems, spectrum display units, frequency monitors and antennas

CB, Hamradio informations & more ...

A simple circuit which will generate a 700 Hz tone into any FM transceiver allowing an amateur to practice CW with another amateur on a 2 meter simplex frequency.

The Icom IC-7300 is a popular HF transceiver among amateur radio operators, known for its advanced features and performance. This modification guide focuses on enabling extended transmission capabilities, specifically for MARS and CAP frequencies. The instructions are based on the work of PA2DB and include detailed steps for removing specific diodes to unlock additional frequency ranges. Before proceeding with the modification, users are advised to take necessary precautions, such as ensuring the radio is powered off and using ESD protection. The guide emphasizes the importance of using appropriate soldering techniques and tools to avoid damaging sensitive components. A video demonstration is also provided to assist users visually in performing the mod. While this modification can enhance the functionality of the IC-7300, it is crucial to note that it may void the warranty and should be undertaken at the operator's own risk. The guide serves as a valuable resource for those looking to expand their operating capabilities with this versatile transceiver.

Lan-Link and Lan-Link for Windows. Other software by G3ZCZ. Some of G3ZCZ's conference papers on amateur radio, and AMSAT editorials

W3EDP multiband wire antenna, an extensive study and analysis of this antenna by W0ESE

The antenna is a vertical dipole, around which four parasitic elements are forming a circle.

Generate QSL cards and labels in your own format. Donationware, windows program by Alpine software officially released for windows XP.

A 2,4 GHz 13cm band quadrible qiad antenna with reflector offering a 14dbd gain

A live audio stream from the _Broadcastify_ platform provides real-time monitoring of public safety communications for Life Net-Air Methods West in Sioux City. This feed allows listeners to monitor emergency services, including air ambulance dispatch and operational traffic, which is crucial for situational awareness during critical incidents. The service offers a direct interface to listen to scanner audio, typically covering VHF/UHF frequencies used by emergency responders. Listeners can access the live feed directly through the web interface, with an option to upgrade to a premium service for ad-free listening and access to feed archives. The platform displays current listener counts and a history of archived audio segments, showing activity over the past 24 hours. This resource is particularly useful for those interested in local emergency response, providing immediate access to scanner traffic without needing a physical radio.

Cal-av labs, inc. (formerly california avionics laboratories, inc.) manufactures electronic instruments and systems for research and industry. we specialize in radio communications and research/electronic test products. Amateur radio yagi antennas, rotary dipoles, baluns, morse keys.

Have you ever wanted to listen in on a serious SO2R DX contest effort? hear what the low bands sound like from New England? enjoy a contest without having access to a radio? This is your chance!

LAPD - Wilshire and Olympic Divisions Live Audio Feed using a Uniden 396T radio scanner

The sun can power your Ham station and a whole lot more. Using solar power panel with a 12 volt battery can permit you to operate autonomously even for several hours without interruption.

This receive only loop covers a frequency range of about 5 MHz to 22 MHz and is built from readily available parts.

Commercial software developed exclusively for scanning 25 to 1300 MHz. No other PCR1000 software offers as many innovative scanning features.

All Band HF Doublet for operation over all HF bands including 160m.

Baluns for amateur and commercial radio.

The page provides a utility to record QSOs for amateur radio operators, allowing them to send the recorded signal back to the other station. It addresses challenges with VOX capability in radios and offers solutions for different radio models.

The PDF document, titled "J-Poles," presents various J-pole antenna designs covering the 50 MHz to 450 MHz frequency range. It includes construction details for several specific bands, such as a 6-meter J-pole, a 2-meter J-pole, and a 70-centimeter J-pole. The content outlines the fundamental principles of J-pole operation, including the quarter-wave radiator and half-wave matching stub. Each design features specific dimensions for elements like the radiator length, stub length, and spacing, often expressed in inches. The document also discusses feeding arrangements and impedance matching considerations inherent to J-pole antennas. It provides practical guidance for homebrewing these antennas using common materials like copper pipe or wire elements. The resource offers insights into the advantages of J-poles, such as their omnidirectional pattern and ease of construction, making it a practical reference for radio amateurs interested in VHF/UHF antenna projects.

Progress in Design of Extremely Short Transmitting Antennas Short and still efficient, how is that possible? By Juergen Schaefer, DL7PE author of the MicroVert antenna concept. The MicroVert introduced in this document is an extremely short and hardly visible short-wave antenna with outstanding radiation properties

Online log for 5V7TT Togo dxpedition 2010. Offer QSL request service.

A project for a homemade multiband Hexbeam antenna for 10, 12, 15, 17 and 20 meters

A simple delta loop antenna antenna for the six metre amateur radio band

Gap Titan DX Antenna manual. This is an enhanced version of the common Gap Titan DX Manual document you can download from other sites. This manual is in PDF Format.

Anyone attempting to work DX on Top-Band 160 Meters, soon learns of the need for a good receiving antenna. This is a 160 meter 8 element receiving array.

Plans and drawings of common amateur radio antennas, like jpoles, copper cactus, super jpole, omnidirectionals and quads

Receiving Common Mode Noise shows how lack of a balun can contribute to system noise

A complete review of Icom IC-706 review published in 1999 by QST

Detailed and searchable maps by mapblast

HX-B5i five band HexBeam installation

1AT917 Daniele Homepage

Comparison of several UHF antennas by DF9CY

easily design your cable, pick connectors and cable, print drawing, get immediate quote and place order, all online.

English version of the Yaesu FT-7800 operating manual

Shortwave radio reviews ar swling.com

Transverter for 70MHz, a project by G3XBM

A five element quad antenna for 144 MHz DIY Project. This 2 Meter 5 Element Quad antenna was modeled using EZNEC, with a boom from a UHF TV antenna and CPVC pipe for spreaders. Constructed for 146MHz, it exhibits a gain of 10.7dB and an impedance of 75 ohms. Real-world results surpass the HT antenna, reaching over 20 repeaters up to 75 miles away. The design, costing around $10, employs simple tools for assembly.

Australia's largest online database of VK email & URL's. Home of the AAR Netring and VK Classifieds. Repeater lists, maps and more...

BIRD RF power measuring, new and used, HENRY RF power amplifiers (used HF amps), TOHTSU coaxial relays, SAMLEX power supplies, RFI chokes reduce interference, Parts parts, tubes, Used amplifiers, radios, antennas and accessories, Los Angeles, CA.

For radio amateurs seeking compact and efficient antenna solutions, particularly for restricted spaces or noise reduction, HF loop antennas present a viable option. This resource compiles several articles from the ARRL, detailing the theory, design considerations, and practical construction of various loop configurations. Topics include small transmitting loops, receiving loops, and multi-band designs, often emphasizing their performance characteristics such as directivity, bandwidth, and impedance matching. The collected articles provide insights into the comparative performance of different loop geometries, such as circular versus square loops, and discuss the impact of conductor size and tuning methods on efficiency. Practical applications are explored, including their use in portable operations, stealth installations, and urban environments where noise mitigation is critical. The content often includes construction diagrams, parts lists, and performance data derived from modeling or field tests, enabling hams to replicate or adapt the designs for their specific operating conditions.

An interesting article with many technical details on a phased delta loop array for 80 meters band includes pictures of antenna relays

XPWare offers support for AEA, Kantronics, SCS/Paccomm and Hal controllers. The program also offers full transceiver control for most of todays HF radios and support DX Cluster monitoring. No more supported and developed by author. Now freeware.

Slot antennas explained

Amidon Associates, Inc. provides a comprehensive selection of inductive components, including ferrite toroids like the FT-50-61 and FT-50-43, alongside iron powder toroids such as the T50-2. These cores are frequently employed by radio amateurs for constructing baluns, ununs, and RF chokes, essential for impedance matching and common-mode current suppression in the shack. The company also supplies ferrite beads, split cores, and cable clamp-ons, which are critical for mitigating EMI and RFI in various electronic systems. Beyond core materials, Amidon offers mounts, bobbins, tunable inductors, and specialized wiring components like PTFE tubing, catering to diverse project requirements. They also provide custom winding services, allowing for tailored solutions in both amateur and commercial designs. Top-selling items include the BN-61-202, a common choice for broadband transformers, and the FB-43-801 ferrite bead, often used for decoupling and parasitic suppression in RF circuits. Amidon further expands its inventory by distributing products from other manufacturers, including Gowanda Electronics and Leader Tech, Inc., broadening the range of components available for hams and engineers.

JIM, N0UQZ TS-2000 review

Simple inexpensive program that allows L-C filters designed by PCFILT or S/FILSYN which are to be built using air wound inductors and single layer capacitors cut from alumina or duroid substrate materials

One specific challenge in the KazShack, operating Single Operator Two Radios (SO2R), involved sharing a K9AY receive antenna between two transceivers without direct RF connection or manual feedline swapping. The solution, detailed in this project, adapts the **W3LPL RX bandpass filter** design to split 160m and 80m signals, feeding them to separate radio inputs while maintaining isolation. This approach also addresses the issue of strong broadcast band interference from a nearby 50KW WPTF transmitter on 680kc. The construction utilizes T-50-3 toroids and NP0 ceramic capacitors, built in a "dead bug" style on copper clad board. Each band's filter coils are identical and resonated to the desired frequency using an MFJ-259 antenna analyzer. A single DPDT relay, controlled by a remote toggle switch mounted on an aluminum panel, facilitates quick band switching between radios, simplifying low-band operations. While some signal loss is noted, the expected lower noise levels from the receive antenna are anticipated to compensate, potentially reducing the need for constant volume adjustments during toggling between transmit and receive antennas.