GM3SEK's Amateur Radio Technical Notebook



RF Power Amplifiers

The Triode Board
PC board for Triode PA control and protection
Download the complete Triode Board Instruction Manual

The Tetrode Boards
PC boards for Tetrode PA control and protection
Download the complete Tetrode Boards Instruction Manual

Tried and tested solutions
We have supplied
over 2000 Boards and Kits in the past 15 years
to customers all around the world.

Order online, direct from the designer

Power Amplifier Design and Operation

Clean Signals

Tube PA Design and Construction

Sequencing and Relay Switching

RFI Filters


Sad to say,
is no longer available

If you're still looking for a copy, set a permanent 'Watch' for the title on

Front Cover

Corrections and updates


VHF/UHF Long Yagi Workshop

VE7BQH Yagi Performance Tables
Updated regularly
The 'world standard' benchmarks for Yagi performance on 50MHz, 144MHz and 432MHz.
Charts of G/T and Gain versus Boom Length

Stacking Yagis for the Same or Different Bands

DUBUS magazine and DUBUS-Technik books
DUBUS Archives 1982-1992


In Practice

Thanks to everyone for reading and contributing to this column since 1993.

There will be no more monthly 'In Practice' columns, but these web pages will continue to be updated.

The 'In Practice' pages
More information about ongoing topics

Cost-effective Ferrite Chokes and Baluns
Latest version of the extended Radcom article

More about Ferrite Chokes

"The Problem Solver"

Best of 'In Practice' on the web
Articles and resources of long-term interest

Cumulative Index, 1993 - 2010
All 207 monthly columns, indexed by topic

UK Component and Tool Suppliers
Where to buy, how to order - still active, please keep sending your recommendations



E-mail GM3SEK

Last updated 10 November, 2014
Page (c) 1996-2013 IFWtech.
Some graphics (c) DIR Publishing Ltd; (c) Eimac, Inc; (c) RSGB; (c) Svetlana, Inc.
GS35b photo by courtesy of PE1OGF