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Source of common model manuals and amateur help on amplifier problems for the amateur bands, Discussion of vacuum tube amplifiers. Technical information and discussion of obselete tube replacement.

Phased arrays of short vertical antennas. A technical notes from Butternut antennas on phased vertical arrays

Dimension and formula for a 4 element QUAD antenna for the 10 meters band

A lot of good informations concerning antennas, filters, moonbounce, and circuitry data.

RFI/EMI RadioFrequency interference/electromagnetic interference by ARRL Technical Information Service page

Well documented Amateur Radio HF/VHF antenna projects, high power Russian GS35B RF amplifiers, mobile RFI solutions, related accessories, vintage radios, Six meter equipment, and useful techniques by K8CU are inside.

Traps can be one way round multiband coverage without the need of an atu. Learn how to homebrew your own traps

Technical questions answered about grounding techniques, in pdf file

ARRL Laboratory Expanded Test-Result Report Kenwood TS-2000 prepared by American Radio Relay League, Inc. Technical Department Laboratory in pdf format

Yaesu FT-857 offers an availability of changing parameters through the hidden menu.

VHF, UHF page, technical articles, projects, datasheets

The FL-2100Z amplifier referenced in the following images is the 6-Band model covering 10m thru 160m (no WARC bands) and not the 9-Band version that included the WARC bands. Modifications, schematics and manual

The Radio Component Database offers a structured collection of technical documentation for various radio components, primarily focusing on those relevant to CB-Radio and general transmitter/receiver equipment. It categorizes components such as RF Bipolar Small Signal Transistors, RF FET Small Signal Transistors, RF Power Transistors, and Integrated Circuits, providing specific data for each type. The resource includes a "Shortform Transistor Catalogue" and a section dedicated to Variable Capacitance Diodes, detailing their characteristics and applications. A significant feature is the inclusion of cross-reference databases from major manufacturers like NTE Electronics Inc., ECG, Fujitsu, Motorola RF-Components, and Philips Components, which can be invaluable for component substitution or identification. Users can access specific technical data from manufacturers such as National Semiconductor, NEC Semiconductor, and Toshiba Components, with some data available in _PDF_ format. The database serves as a reference for hams and technicians working with RF circuitry, offering a centralized location for component specifications and alternatives, which can save considerable time during design or repair work.

Almost a fresh QSL manager Database, Country Tables for YPLOG by VE6YP (updated monthly), Additional files for the TRLoog by N6TR. Technical topics for HF Contesting (mostly CW), software download (a huge collection)

The page provides detailed information on coax stub filters for multi-transmitter setups, including specific lengths for different bands and types of coax. It also references additional technical notes for further analysis.

Assorted Grounding Hints and Kinks and Technical Correspondence, Grounding Techniques, Conductivity in the Cold, Cold Ground, Is Your Radio Equipment REALLY Grounded?

The image is a all in one map of ITU Zones displaying worldwide regions and zones. It provides information on ITU Regions at IARU website, aimed at radio amateurs and technical users. Image size is in hight resolution and jpeg format, free to download.

G8ODE schema to reduce a half-size G5RV to 70 ft.

An assortment of Amateur Radio-related technical articles written for the JUG, the newsletter of the Northern California Contest Club. Topics include unique but simple and useful radio modifications and accessories, and rig reviews.

Excel sheet containing technical comparisons of commercial HF portable antennas compiled by ON4SKY. Includes pictures, manufacturer, db gain, band coverage, F/B ratio, price, weight and dimensions.

Remote Control Antenna Switch made with two circuits board

The ICOM IC-7300 is a cutting-edge HF transceiver that has garnered significant attention since its release. This review, published by ARRL in QST, provides an in-depth analysis of its features, performance, and usability. The IC-7300 is known for its direct sampling technology, which enhances its sensitivity and selectivity, making it a favorite among amateur radio operators. The review covers various aspects, including the user interface, audio quality, and overall operational capabilities, providing valuable insights for both new and experienced hams. In addition to its technical specifications, the review discusses the IC-7300's performance in real-world scenarios, such as DXing and contesting. It highlights the transceiver's ability to handle weak signals and its versatility across different modes. The review serves as a helpful guide for those considering the IC-7300 for their station, offering a balanced perspective on its strengths and potential drawbacks. Overall, this review is an essential resource for anyone interested in the ICOM IC-7300 and its place in the amateur radio landscape.

Hexagonal wire beams for all hf bands, technical resource, EZNEC files, tools for antenna modeling and documentation. You can also order parts to build your own antenna.

W4TI review the popular Yaesu FT 857 quadriband transceiver

What is ground?RF ground and the ground plane, how can I tell if I have a good ground? ground loops

A Mini Moxon antenna for 40 meters band project in a well done PDF document

OZ2OE Technical Home Page - 432 MHz PA with 8874

D3+ High Performance Antennas for Field Day. This article describes versatile broadband wire antennas. These antennas will double your effective radiated power over a dipole, will be easy and inexpensive to build and install, and will be simple to match.

This document serves as a comprehensive guide for amateur radio operators looking to enhance their Yaesu FT-2000 or FT-950 transceivers with pan-adapter capabilities. A pan-adapter is an invaluable tool that allows operators to visualize the frequency spectrum, making it easier to identify signals and improve operational strategies. The guide details the necessary hardware modifications, including the RF Space IF-2000 board and various SDR options, along with their costs and installation procedures. The document caters to operators of varying technical expertise, providing step-by-step instructions and troubleshooting tips. It emphasizes the importance of using a sound card and software like PowerSDR and HRD for optimal functionality. By implementing these modifications, users can monitor multiple frequencies simultaneously, leading to a more productive and enjoyable amateur radio experience. This resource is particularly beneficial for those looking to modernize their equipment and remain competitive in the ever-evolving world of amateur radio.

Compiling an extensive collection of technical information, the Repeater Builder's website serves as a critical resource for those involved in amateur and commercial repeater systems. It covers a broad spectrum of topics essential for the design, construction, and ongoing maintenance of these vital communication hubs, drawing from years of practical experience in the field. The site provides detailed insights into various aspects of repeater technology, including specific information on VHF and UHF bands, such as 2-meter systems. Users can find data related to repeater logic, control systems, and interfacing with other radio infrastructure, all presented with a focus on practical application. Authored by Kevin Custer, W3KKC, the content reflects a deep understanding of repeater operations and engineering, offering guidance that extends beyond basic setup to advanced troubleshooting and optimization.

Make yourself a Diplexer

D-star technical requirements and documentation

Yet another G5RV antenna plan to build a G5RV Antenna for 80 to 10 meters usage

by Lou Blasco VK3ALB

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

HX-B5i five band HexBeam installation

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

An easy method for erecting antenna masts using readily available material

The DL6WU yagi antenna for 23cm band

If you want to build a repeater, this is the right place to start. Includes construction projects and reviews of repeater hardware available in the market.

CQDX11.com serves as a vital hub for Citizens Band (CB) radio operators, particularly those interested in the 27 MHz band. The site offers a wealth of information on CB radio models, modifications, and antennas, catering to both beginners and seasoned DXers. Users can explore various resources, including a logbook for tracking contacts, forums for community interaction, and guides on equipment and techniques for effective communication. In addition to technical resources, CQDX11.com emphasizes the social aspect of CB radio, providing a platform for users to share experiences, tips, and engage in real-time chat. The site also features a section dedicated to CB radio news and updates, ensuring operators stay informed about the latest trends and developments in the CB community. Whether you're looking to enhance your setup or connect with fellow enthusiasts, CQDX11.com is an essential destination for all things related to CB radio.

The page is about the 144 Mhz Dirty Beacon project, a VHF beacon keyer by 9A4QV. It provides technical information, project details, and resources for amateur radio operators interested in beacon keyers. The content is useful for those looking to build or learn about VHF beacon keyers.

A vertical portable antenna system by W0SJS that will work on 40, 30, 20, 17 and 15 meters

A very short dipole with a good radiation efficiently plus a respectable bandwidth by S. C. Chuck Smith, WA7RAI

SARA is a dedicated group of people that formed an international society to learn, trade technical information and do their own observations of the radio sky

CTCSS Decoder and Encoder, DTMF Decoder projects

Thierry LOMBRY, ON4SKY, develops in several technical articles the way to select a transceiver. His website includes also some in-depth reviews

This article presents a technical investigation into spurious emissions from the Yaesu FT-847 transceiver when operating on the 70MHz (4-meter) band. The author discovered significant problems with both factory "UK spec" and modified units. Spectrum analysis revealed that when transmitting at 70.2MHz, the radio produces numerous spurious signals, with the most prominent emission at 45.6MHz measuring only 3dB below the fundamental frequency. The study also documents poor power efficiency on 4m (10.3% at 30W output) compared to 6m operation (23.5% at 30W). Tests verified that jumper configurations had no effect on filter selection. The author warns that using these radios on 4m may violate license conditions due to excessive spurious emissions.

Technical and modification information on Astron Power Supplies compiled from a number of different sources by Mike Morris WA6ILQ

Technical details of the yaesu FT 9000