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Common problems and improper operations of Yaesu FL 2100 RF power amplifier

Article on how use Genesys sowftware to design RF power amplifiers

Complete catalog of low noise preamplifiers and microwave Gunnplexers.

A rebuild job on a Heathkit SB-200 amplifier by N4NAB

Review by Clive Davies, G4FV

This document details the design and construction of the PA70H, a 50-watt RF amplifier for the 70MHz (4-meter) amateur radio band. Built around the Mitsubishi RD70HVF1 MOSFET transistor, the amplifier delivers 45-55W output with 3-5W input power while operating on 13.8V DC at approximately 7-8A. The PCB design incorporates multiple protection circuits including overcurrent, SWR, and temperature control. The amplifier features various control modes including GND PTT, +13.8V PTT, and RF VOX. Two versions are available: PA70HLI (requiring 100mW input with additional driver) and PA70H (for 3-5W input). The comprehensive documentation includes circuit diagrams, assembly instructions, and performance data showing successful operation from both 100mW and 3.5W input sources.

Amateur Television products, online store for ATV transmitters receivers, LCD controllers, wireless cameras, video senders, accessories, power amplifiers based in UK

This article loaded with nice pictures and schematics, describes a 160-10 meter linear amplifier that uses a pair of 3-500Z triode power tubes. It was designed and constructed by William Moneysmith, W4NFR. The amplifier features fast warm up and 1500-Watt RF output with 100-Watts of drive.

Negative feedback is often referred to as shunt feedback in conjunction with emitter degeneration.

A comeplete home made 600W LDMOS RF power amplifier. Settings can be made on a 7-inch touch screen, and on this screen you can see a lot of useful information during operation, such as output power, temperature, SWR, and so on. The power amplifier includes 2 MRF300 LDMOS FETs and several built-in sensors. The amplifier also contains several types of protection functions like too high current, too high swr, too high temperature, etc.

Extremely reliable FET preamplifier can handle several watts directly into either the input or the output without failure

Low signal, noise-high AC gain preamplifier

This is an internet resource for those interested in guitar amplifiers, vacuum tubes, and design tools such as SPICE modelling.

Repairing and restoring a Yaesu FL-2100Z amplifier

Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.

Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter

The Yaesu FL2100Z is a HF linear amplifier rated for 1200W PEP input, and using two 572B triode tubes. This article explores the recommended operating conditions, and alternatives.

Tests on a preamplifier for 50 MHz installed right at the feedpoint of the antenna.

Heathkit SB-220 Amplifier modification by KE5YA

A home made VHF 2.5kw RF power amplifier made with a GS35B Triode and designed by Frank F1CXX built in 2003

VHF RF power amplifiers manufacturerr

The TMB-1 is an RF amplifier unit / receiving accessory that can be used with a low-impedance broadband loop, a high-impedance terminated loop (such as a Pennant, Flag, or Kaz Delta), and whip (telescoping rod) antennas.

low-noise amplifier for HF reception, amplifies signals 80 to 100 times between 0.15 MHz and 30 MHz. It will let you hear more signals with your RTL-SDR plus Ham-It-Up setup

Article about assembling of a Dick Smith Electronics (DSE) 100 Watt VHF Linear Amplifier kit.

Schematic diagram of the VLA 200 power amplifier by RM Italy

IC8POF's How To index, Hamradio mods, Crazy PA Tuner project (transform any manual amplifier in an automatic one).

4CX1500B RF amplifier schematic, working 1.8 MHz to 29.7 MHz

VHF Power amplifier VLA 200 english manual

K6ODV Six Meter KW Amplifier Designs

Relay substitution tutorial, power amplifier tuning and Technical Characteristics

Here is a simple, self-contained beacon which can run a few milliwatts or as much as a watt depending on choice of amplifier and supply voltage.

Linear Amp UK manufacture a range of high quality linear amplifiers for amateur and commercial use. Production includes HF, VHF and UHF amplifiers.

QST Magazine Product Reviews - Key Measurements Summary - HF-Transceivers or Receiver and Linear Amplifiers

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

ON6MU Low Power amplifier

High impedance amplifiers for shortened vertical antennas, Array matched and Optimized 15dB Preamplifier

The Pecker is a software application that emulates an existing hardware amplifier tuning aid operated in SSB mode as apposed to CW or AM. As such no carrier is used by G7EIX

Amplifier repair and conversion, specialize in converting HF amplifiers to operate as monoband amps on 50 MHz

A page dedicated to Yaesu FL-2100Z linear amplifier for amateur hf bands

Specialize in engineering, design and repair of all rf equipment. Dealer for two way radios, scanners, shortwave radios, wi-fi antennas, wifi amplifiers. Based in Fortuna, California.

The Ameritron ALS-600 600-Watt HF Power Amplifier review by AD5X

Pictures of a monoband linear amplifier for 40m band - 2 x QB5/1750 made by 9A6A

Omega Electronics International is the source for Ameritron linear amplifiers as well as other amateur related products and repair service

AL-811 and AL-811H specifications and information about this 600-800 Watt ham radio ower amplifiers

An easy to build with a cheap HEMT FET Transistor Low noise preamplifier with FHX35LG based on JH0WJF design

This Class E RF amplifier will deliver up to 400 watts of RF output

Mark Connelly, WA1ION article on Medium Frequency Amplifier Circuits in PDF format, include some RF amplifier schematics

Two coupled PAs with each 2 times 2C39 deliver around 400W RF.

100 W output RF amplifier for 10 meter band project by W4NFR

Design and manufacture application specific microwave and RF amplifiers, upconverters, downconverters and multifunction assemblies.