Technical Projects and Presentations 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)

Constructing a portable station using a HVOB (Highly Versatile Orange Box), by Charles, K4AFN and Bob, N7INK (1.9MB PDF file)

HVOB station There are ideas, plans, suggestions and photos of HVOBs constructed by K4AFN and N7INK and also some web references for other examples. The unique feature of this project is that the radios and equipment are attached to a rack that can be removed from the case to access wiring connections on the rear of the rack or for operation outside of the case on a bench or table. The case is water tite and sturdy enough to sit on. The box is deep enough to provide ample room in the back for accessories and cables. There is also room for your manuals, charts, spare parts, and antenna components.

Technical Presentations at CARA Meetings

Thanks to Clarence Peckham NT7V for his excellent
Software Defined Radio (SDR)
presentation at the Feb 1 CARA meeting.
Click here for the PDF version. Click here for more info.

WB6OTS: Contesting and Why It's Important at the Oct 5, 2009 CARA meeting

WB6OTS' National Traffic System (NTS) presentation at the Oct 6, 2008 CARA meeting

K7WIN's Satellite Presentation at the Feb 4, 2008 CARA meeting

Page updated 26 Mar 2010