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Linear Amp UK specializes in the design and production of high-quality linear amplifiers, offering models for HF, VHF, and UHF amateur and commercial applications. The company emphasizes nearly 30 years of experience in crafting each unit, ensuring robust performance and longevity. Their product line includes amplifiers engineered for a 100% duty cycle, promoting continuous and reliable operation across various modes. The amplifiers feature solid, dependable designs, ensuring quiet and effortless performance during transmission. Each unit is hand-built to stringent standards, reflecting a commitment to durability and operational stability. All products are CE approved, confirming compliance with European safety and environmental directives, and come with a standard two-year warranty, providing assurance to operators. Key specifications often include coverage for 1.8-30MHz (WARC bands), 50MHz, 70MHz, and 144MHz, utilizing tubes such as 811, 572, 811A, 572B, GS35, GS35B, 8877, 3CX1500, and _3CX1500A7_ in their designs.

Mac the Scope is a professional quality signal analyzer, 1/3 octave RTA, signal generator, and more.

Improving measurement accuracy when low-power analyzers are used.

Schematic of a homebrew receiver and keying

Donwload the Kenwood TL-922A user Manual

Review of the Kenwood TS 830

With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.

This resource provides a detailed historical record of satellite downlink frequencies, systematically organized by both frequency range and the satellite's launch year. It presents extensive listings covering segments from 8 MHz to 9000 MHz, including specific breakdowns like 136-137 MHz and 1600-2200 MHz. The data is segmented into distinct frequency blocks, offering granular information for various bands. The content delineates frequencies for satellites launched across several decades, with specific sections for years such as 2004, 1999, and extending back to 1967. This chronological organization allows for tracking the evolution of satellite communication frequencies over time. The resource serves as a reference for identifying operational downlink frequencies of historical space assets, which is particularly useful for satellite enthusiasts and those interested in _space tracking_ or _vintage satellite_ communications. The utility of this compilation lies in its specific historical data, providing a unique perspective on past satellite operations and frequency allocations.

G4ILO compares popular antennas for 2 metre band handhelds so as to see how much you lose using a small inconspicuous antenna or how much you gain by using a long antenna.

A general article on CMC, common mode choke include a description and tipical usage.

A parabolic dish ring feed optimum resonance frequency of 1325MHz

Article on ham radio mobile operation from Andy D. Crouch N5NDD

Amateur (Ham) Radio Practice Exams and Study Aids, as well as other content of interest to the Ham Radio community. Presented by Michael Burkhardt W8MHB.

The Boston Amateur Radio Club (W1BOS), and ham radio in Eastern Massachusetts

Cushcraft A3S HF antenna 1:1 balun repair.

This page list schedules for the E10 Spy Number shortwave radio station, commonly believed to be run by mossad.

A multi band portable link dipole antenna for 20 30 and 40 meters band

Archive of yaesu ft-1000MP digests since january 2001

3W6C on-line log DXpedition 2010

Find out how much to adjust the length of a quarter wave whip or a half wave dipole rather than the outright cut-and-try method.

"Sezione A.R.I. di Torino presents ""Sala Radio"" dedicated to Duilio Secoli I1TMD"

KE7FTE, N7QQU and W9ERT show us the "drag and drop" flexibility of the Icom D-STAR System.

The broad band hexagonal beam (hexbeam) designed by G3TXQ and built by K4KIO

Kenwood TH-D7a TX band modification

Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept

What makes a good solid-state amp ? by Adam Farson, VA7OJ/AB4OJ, May 2002

The Swan Island DX Assn. is based in Raleigh, NC.

7O6T log oline - 7O6T Club Log

Bencher Tech Notes: Selecting your next yagi

How to build a QFH (Quadrifilar Helix Antenna) to download images from weather satellites. A complete tutorial on assembling QFH antenna at home with simple and common tools

All about amateur radio lincencing in India

Recordings of RF noise from personal computers, peripherals and related equipment. If you can match noise at your location to one of these files then you can be confident that you know where your noise is coming from.

Small antenna, what causes loss and how to increase radiation resistance in small antennas., A description of loss and radiation resistance.

This circuit enables fair copy of strong 444 MHz signals, off a local repeater, using a 2m rig and a 1/4λ 70 cm indoor ground plane antenna.

Personal web site of 14AT920 Thierry

5M2TT Log Search Liberia 2011 dx pedition

EB5AGV / EC5AAU Boatanchor collection. Useful data on TV-testers, Collins, Drake, Hammarlund, Hallicrafters, National, Heathkit, EF Johnson.

Electrically shortened dipole antennas, article by Mark Connelly, WA1ION

The Cabrillo log format specifications, examples and templates.

NVIS definition at Wikipedia

Compiles a detailed calendar of RTTY contests, providing essential information for digital mode enthusiasts. It lists contest dates, links to official rules, and often includes historical results and records, enabling operators to plan their contesting schedule and review past performances. The resource covers a wide array of RTTY events, from major international contests like the _ARRL RTTY Roundup_ and _CQ WW RTTY_ to smaller, regional competitions. Operators can quickly identify upcoming RTTY contests, review specific rules for each event, and access historical data to gauge competition levels. For example, the site details the _BARTG RTTY Sprint_ and the _SARTG New Years_ contest, offering a centralized hub for RTTY contesting information. This resource is particularly useful for those aiming to improve their digital contesting skills or track their progress against established **records**.

A comparative article on performance differences between Slim Jim antennas versus J-Pole antennas

Direct Conversion Receiver for Software Radio Soft66AD

Quad antenna homebrewing, mechanical considerations by IZ7ATH

Theory of the ferrite rod antenna

May SwaziLand Web Page

The reasons for logging your amateur activity fall into three categories: legal, operational and personal. Legally, a log of your transmissions would be invaluable in proving your innocence in an interference complaint. Operationally, having a log of past contacts is a resource when filling out that DX QSL card that may have taken months to arrive

Listen to Missouri State Highway Patrol live scanner

Antennas for Broadcasters, PSI manufactures a complete range of slot antennas for UHF television broadcasting

"Croatian Radio-Television Public Corporation (Hrvatska radiotelevizija, ""HRT"")"