Technical Projects Page


If you have a technical project or idea to share, email the Webmaster with the write-up and any schematics, photos, etc.


Antenna Pre-amp Power Sequencer Protection Circuit, By John, KD7DO

How to build a G5RV 3.5MHz - 28MHz antenna, by Charles, K4AFN (this is a 2MB PDF file)

Constructing inexpensive sound card interfaces,
by Charles, K4AFN (PDF)
These three circuits interface your transceiver audio in, audio out, and press-to-talk with your computer.
"I have built several of these and they work just fine. I have used them on HF tube tranceivers (HW-101), Yaseu and Icom HF rigs, VHF mobiles and HTs."

Portable Dual Band Antenna, by Charles, K4AFN (1.2MB PDF file)

Page updated 09 Mar 2009