28v power supply

VA3GRR - Radio Beacon - VA3GRR is a radio beacon, operating on the 10 meter amateur band. Its frequency is 28.205.5 MHz. It runs just under 5 watts of power into a vertical half-wave ringo style antenna

Sunelco - Solar and wind energy products, Water Pumping, Hydro power solution, chargers inverters, batteries, Hydrogen Fuel Cells

United Solar Ovonic - Leader in building rooftop photovoltaics and other solar power products. Manufacturer of thin-film solar laminates UNI-Solar

Lunar Link Systems - VHF UHF Power amplifiers and accessories

BG Micro - All kind of electronic components, Hobby Electronics and Parts, motors, Sun power solar panels, switches, rechargeable batteries, RF Coils, Coils and Chokes

DICL - Customized Power Supply - Design and manufacture switching power supply for global customers in many field , such as industry , medical , radio , telecome

Astrodyne - Dedicated to the design, manufacturing, technical support, and delivery of innovative and cost effective power solutions for worldwide applications. AC/DC switching power supplies and DC/DC converters.

KD1JV Designs - QRP Kits and Projects for the low power Amateur Radio enthusiast

Hi-Line Utility Supply - Furnishing Quality Tools & Equipment For Construction and Maintenance of Above and Underground installations.

The KA7OEI FT-817 pages - FT-817 Radio Modifications, Improving the FT-817 Noise Blanker, increasing output power, using rechargeable cells, epanding frequency range

Solar Panel Store - Focus on solar power products that function in the harshest environments, designed for years of reliable service.

AEE Solar - Wholesale distributor of alternative power products, solar panels

Herbach & Rademan - Pioneer supplier in the radio parts field, and electronic components, alternative power products, kits, test equipment and computer components.

Alliance Test Equipment - Alliance Test buys and sells used network analyzers, spectrum analyzers, function generators, mulitmeters, probes, optical power meters, calibrators, attenuators, testers, and more from Tektronix, Fluke, Rhode & Schwarz, Advantest, LeCroy, Fujikura, California Instruments, NetTest, Keithley, Actrena / TCC, Instek

Enable Low Cost RF Power Amplifiers - A new paradigm for low cost, reliable RF amplifier ‘pallets’ has been enabled by new circuit design, manufacturing and thermal management techniques

Highly linear rf power amplifier design - The need of high linearity is one of the principal drivers in the design of power amplifiers for new generation applications

Desgin Power amplifiers with Genesys - Article on how use Genesys sowftware to design RF power amplifiers

Power Aamps RF voltages - This test circuit is easy to duplicate, and demonstrates the extreme voltages that appear in an amplifier when the load is improper for the amount of drive power applied.

Power Gride Tubes - 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.

144 MHz PA with MRF317 - A 2 meter power amplifier

Remote antenna switch - A remote antenna change-over switching using relay powered over the coaxial feeder

Coaxial Cable's specifications - A table with Loss in DB/100m , Max power in Watts, Diameter in mm , Velocity factor (VF)

Loss Calculator - Calculate power loss depending on coax cable you use

Tools and Links for RF Power Amplifier Builders - This document lists a few tools, documents and websites which are valuable in the design and construction of amateur RF power amplifiers. The list is small but it represents a good starting point for the amateur amplifier builder.

Lightning Protection : Protecting each I/O line - KB22UT Article on how protecting ham radio station and in particular I/O Lines such as AC power, coax cable, control circuits, telephone line.