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This high range amplifier is very small [SB200 size] Vacuum variable input and output caps as well input and output switching.

Presents _Henry Radio Inc._ as a manufacturer of solid-state RF power amplifiers, detailing their capabilities across HF, VHF, and UHF bands. The company designs and builds custom amplifiers tailored for various applications, including amateur radio, commercial broadcasting, military, scientific, and industrial uses. These amplifiers are manufactured in the USA, emphasizing domestic production. Beyond amplifier manufacturing, the resource highlights Henry Radio's role as a distributor for _Bird RF Test Equipment_, including wattmeters, dummy loads, and attenuators. It also mentions _Tohtsu Coaxial Relays_ and a range of miscellaneous amplifier parts and electronic accessories, providing a broader scope of communication equipment offerings. Additionally, the site describes a trunking two-way radio system operating on the 450-476 MHz band, covering significant portions of Los Angeles and Orange County. This service caters to professional dispatch needs for ambulances, taxis, and other commercial entities, requiring no long-term contracts.

RF propagation software

Excellent guide to build your own G5RV antenna by Lombry

8 elements quad antenna for 2 meters band, centered on 145 Mhz

Amateur radio operators often seek reliable equipment for various modes and bands, from QRP operations to high-power DXing. Historically, Ten-Tec has been a notable manufacturer in the amateur radio market, known for its range of products including HF and VHF transceivers, RF amplifiers, and antenna analyzers. Their product line also encompassed specialized items such as QRP transceivers and kits, catering to enthusiasts of low-power communication, and antenna tuners for impedance matching. The company's offerings included test equipment vital for shack setup and maintenance, like SWR meters and RF analyzers, which assist in optimizing antenna systems and ensuring efficient power transfer. Additionally, Ten-Tec provided various accessories and components, supporting both commercial products and homebrew projects. The brand was recognized for its _made in the USA_ manufacturing, appealing to operators who prioritize domestic production. While the website currently displays limited product information, it mentions upcoming items like the _MODEL 594 PHOENIX_ and the _Tune-A-Tenna_, indicating potential future product releases.

Article on a small magnetic loop antenna for forty meters band by Ben Smith

RF Concepts manufacturer of Alpha Linear Amplifiers, amateur radio RF power amplifiers, commercial power amplifiers, power meters and dummy loads.

Demonstrates RadioComm, a freeware Icom transceiver/receiver controller program for Windows, which facilitates memory programming, spectrum analysis, and interfacing with extensive frequency databases. The software allows users to program their Icom radio's memory, generate radio-frequency spectra, and connect the radio to a computer-based frequency database. It supports various Icom models, offering bidirectional control where virtual controls mirror the transceiver's physical controls and vice versa. The program's spectrum analysis feature, exemplified by tuning the WWV time standard at 15 MHz, provides insights into the AM passband, a capability often found in high-end Icom transceivers. While RadioComm offers these functionalities, the author, Paul Lutus, notes that it has been superseded by JRX (a virtual radio) and IcomProgrammer II (a memory programming utility), which are described as superior and compatible with more platforms. RadioComm is available as a 516 KB self-extracting executable, requiring an Icom CT-17 RS-232 interface box for radios that need it. Users can also customize the plain-text database to include unsupported Icom models. However, the author explicitly states that no user support is provided for this free program.

Over 25,000 amplifiers and sub-assemblies were produced by Angle Linear for the communications industry over a 40-year period. The company specialized in **high-linearity RF products**, focusing on preamplifiers, bandpass filters, and receiver multicouplers. Specific product lines included PHEMT and GaAs FET preamplifiers, offering both quadrature and single-ended configurations for various signal levels. The offerings encompassed coaxial and combline bandpass filters, along with integrated filter-preamplifier assemblies. The company also provided custom RF assemblies, addressing applications such as MRI preamplifiers, passive radar, and EME (moon bounce). Their product range covered VHF and UHF frequencies, including specific designs for 2m, 70cm, and 23cm bands, often featuring high IP3 performance. Technical documentation, such as filtering application notes and duplexer theory, was also associated with their product offerings.

PC sound card interfacing for RTTY SSTV PSK31, collection of interface connections to choose from when having a desire to use the Soundboard

GAP Titan DX Evaluation, antenna for 10m 15m 20m 40m 80m

Here you can find a a selections of CAT interfaces for ICOM Yaesu Kenwood.

Schematics for a VHF UHF duplexer

Connect your FT-100 or FT-817 to your pc with this CAT interface cable

This sketch will read RF power and SWR from any SWR bridge, designed to work on VHF UHF bands

This Antenna is not really practical for AO-40 reception, but horn antennas have a number of qualities useful in microwave antenna testing and noise figure measurements.

The _59+ Log_ software, part of the 59+ collection, functions as a logging tool for Windows operating systems, specifically tested on Windows XP where its logbook feature operates smoothly. This collection also includes _59+ CW_, a module designed for Morse code operations, enabling keying of the COM port for transceiver control or simply listening to CW signals via the speaker. The software package, originally hosted on idealog.net, is now available for download as 59soft14.zip (3.4 MB) from IW5EDI's site. While the logbook application is functional, the _59+ CW_ application may encounter issues on newer Windows versions, as indicated by a failure to start on Windows XP during testing. The analyzer and convert modules within the 59+ suite require registration and do not operate in trial mode. Development and support for this software have been discontinued.

A solid state amplifier for HF and 6 meters band by N4IP

This free software is useful for visualizing terrain and performing Longley-Rice path loss and coverage prediction using the Irregular Terrain Model. A Windows port of the Linux-based SPLAT by John Magliacane.

Build a PSK-31 PC interface for the yaesu FT-817

"How to remove the so called ""ground loop"" and the reentry in the RTTY broadcast and make radio and PC happily coexist"

Online radio planning system, allow you to generate accurate radio frequency predictions for anywhere on earth

Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL

A 2 meter power amplifier

Some tens of very special audio files recorded during amateur radio activities like aurora traffic, meteor scatter, communications with ISS crew and the sound of various transmission modes that you can hear on HF and VHF bands

Product review & short takes columns from QST magazine

Construction tips to build an automatic``satellite tracking rotor controller using``PIC16F877 IC.

FT857 and FT897 Interface PCB and schematic

Multi-band centre-fed antenna capable of very efficient operation on all HF bands, specifically designed with dimensions which allow it to be installed in gardens and other open spaces which accommodate a reasonably-straight run of 31.1m (102 ft) for the flat-top standard model.

The R.F. Connection Specialist in RF Connectors, Coax, Cables, Grounding

A drawn of a ZL Special antenna for the 10 meter band or 28 Mhz

Drawings of shortened antenna for indoor usage, using short pvc tubes for 2 , 20 and 40 MHz by f1rfm

This project uses a widely available IRF510 MOSFET, work on HF 80, 40, 30, 20 and 17 meter bands

YAESU FT-1000/MP/MARK V (filed) interface, this one of numerous RTX sound blaster interfaces you can find on the internet, but this one include: FSK KEYING to use with the RTTY port, DVS-2 to use the interface in AFSK mode, this include all digital modes + voice keyer, CW KEYING

Perfect ground vs. poor ground. What is the difference? How does the ground influence the DX-gain?

Cat interface for Kenwood transceivers, tested with TS-850 and kenwood TS-50 but should work with all Kenwood rtx

Solid State and TWT Amplifiers From 1 MHz to 40 GHz with Power Levels from .1 mil Watt to 2.5 Kw

Excellent guide to using ferrite cores for interference suppression. Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File

University of Texas Amateur Radio Club RF-Calculator. This is a main beam power density estimation program intended for use as part of a routine evaluation of RF safety compliance with FCC regulations

Antennas, books, rf parts, tubes,connectors and cables and many accessories at RF parts.

Schematics and plans to build a custom CAT and audio pc interface

Thierry LOMBRY, ON4SKY, develops in three long articles all you need to know about amplification, and how to seletc an HF and a solid-state amplifier, with pictures.

HamRadioHomebrew Cat Interface for Yaesu FT-897 by PE1OPM

AM/FM/CW QRP RF Power Amplifier for the HF 10 or 11 meterband (28MHz/27MHz)

An horizontal full wave wire loop antenna for the 80 meters band by W4HM

Unified Microsystems presents a range of amateur radio products, notably the **XT-4 MK2 CW Memory Keyer**, a battery-powered iambic keyer designed for portable operations like Field Day, POTA, SOTA, and DXpeditions. It features four non-volatile memories, each storing approximately 240 Morse characters, and operates at speeds from 8-45 WPM. The XT-4 MK2 also includes an auto power save function and paddle reverse, making it adaptable for multi-operator setups. Beyond the XT-4 MK2, the site details the **W9XT Contest Card**, a PC plug-in board offering DVK and CW interface capabilities, allowing operators to record and playback CQs and contest exchanges. Other offerings include the BevFlex-4X RX Antenna System, RAS-4 RX Antenna Switch, VK-64 Voice CW Keyer, and various USB interfaces. Additional products cover electronic development, such as the ATS-1 Terminal Shield for Arduino™ and VR-X Power Supply Voltage Regulators, demonstrating a broader scope beyond just operating accessories. The XT-4Beacon MK2 / CW IDer is also highlighted for beacon projects, capable of storing messages up to 5 minutes at 25 WPM.

Constructing a high-power solid-state amplifier for HF operations presents unique challenges, particularly when aiming for significant output like 600 watts. This project details an amplifier design employing **Motorola MRF150** FETs, a common choice for their robust performance in RF power applications. The design emphasizes achieving substantial power output, a critical factor for effective DXing and contesting, where every decibel can make a difference in signal propagation and readability. While specific circuit diagrams or construction details are not directly presented on the current page, the mention of MRF150 FETs points towards a design that would typically involve push-pull configurations, impedance matching networks, and robust power supply considerations to handle the high current demands. Such amplifiers are often built with an eye towards linearity and efficiency across the HF bands. Amateurs pursuing similar high-power solid-state projects often share insights on thermal management, intermodulation distortion, and component sourcing, all vital for a stable and reliable amplifier capable of delivering 600 watts into a proper antenna system.

Using Hi-Fi Audio with FT-1000. Includes many FT-1000D modifications too by K6JRF

Why a vertical antenna or longwire antenna might require a balun