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Feeder Radiation - Connecting centre fed antennas, dipoles, yagis, rhombics, loops to coaxial cable, unless care is taken, it is not difficult to end up with feeder radiation resulting in power loss and the radiation characteristics changes

Antenna Gain to ERP - A radio's transmitting power can be concentrated along the horizon by use of a GAIN antenna. Although you may still be transmitting with four watts of power, your effective radiated powerwill be greatly increased. This table shows the effects of antenna gain on a transmitter with 4 watts of transmit power.

HF VHF mini antenna tuner - A small antenna tuner project that cover from 3 to 150 Mhz with a max power of 50 watts by ON6MU

WA8YWO - High Frequency Expermental Beacon "WV". The Beacon operates on the frequency of 13.55567mhz. This Beacon is very low power. It operates under Part 15 of the FCC Rules and Regulations. It transmits with only 1.5 milliwatts of power

Emtron - HF Linear amplifiers and power supplies manufacturer

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

FM Repeater Database - Via this interface you have access to one of the biggest databases on amateur radio voice repeaters.

Yaesu FT-102 page - Relay substitution tutorial, power amplifier tuning and Technical Characteristics

ICOM IC-706MKIIG Tech Note - If your IC-706MKIIG will not power up without even hearing a relay click, check the state of the HV line.

5 Amp power supply for portable usage - A 13,8v/5Amp 78H05 based power supply for portable use. In this example used to power up a Yaesu FT-817

SigJenny - SigJenny turns your PC into a flexible and powerful audio signal generator for free. It can create multiple waveforms, sweep, fire single or repeating tone bursts. You can save your sound as a wav file, display a frequency response, use SigJenny a bit like an oscilloscope, and do a very good impression of a police car!

RF Amplifier basics - Introduction to RF power amplifiers. Basics and guidelines. by wb0nni

A GS-35B Amp For HF - The Show and Tell amp, a GS-35B RF power amplifier for HF being built by W4ZT

Building High Power Amplifiers - SM5BSZ article on building VHF RF amplifiers

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

5th order High Pass VHF Filter - Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem

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.

Power supply from 3 to 30 V with an L200 IC - This was written by dl5dbm, Anwar von Sroka

Power Supply Design - A home learning tutorial on the basics of designing simple power supplies for radio projects by VK2TIP

HV power supplies - WV0NNI 2,800 VDC @ 2 Amps Continuous Variac adjusts filament voltage. A voltage doubler circuit, well suited for smaller, compact linear amplifiers.

30 Volt Computer Power Supply Stack - What do you do with a bunch of old computer power supplies?

Multi-functional Power Supplies - Two types of multi-functional Home-brew 6/8Amps - 20 Ampere variable power supplies by ON6MU

12/20 Ampere power supplies - Two types of home-brewed 12/20 Ampere 13,8volt power supplies, including detailed part lists by ON6MU

Astron RS35m Power Supply Schematic - Astron RS35m Power Supply Schematic annotated with Notes from QST Hands-On Radio, "Experiment #35—Power Supply Analysis" PDF File