GM3SEK's Amateur Radio Technical Notebook

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

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

RF Power Amplifiers

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

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

Tried and tested solutions - in the past 11 years we have supplied more than 1500 sets of boards and kits, to customers around the world.

Amplifier Design and Operation

• How to set up your speech processor

• Intermodulation distortion
  Effects of screen supply stabilisation

• PTT interface and speed-up circuit for RF relays

• Transistor PA bias circuits

• EMC/RFI
      - VHF/UHF harmonic notch filters
      - FM and UHF-TV interference filters

• PSU Designer software
  Accurate, easy to use, and highly recommended! 

• Pi/Pi-L network design/analysis spreadsheet

• NETCALC - an RF network calculator

• Triode amplifier design program

• Simple TX/RX sequencer

• G2DAF Amplifier
  The original articles for reference

• Amplifiers using Russian tubes

• Blower performance curves
  Estimate by Excel spreadsheet