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| John, ON4UN, and Roger, ON6WU, Inspecting the Control/Switching System (May 2005) |
Greg Ordy
This collection of pages describes my largest antenna project to date. It's a 6-element vertical array which is designed for 40 and 80 meter operation, and receive-only operation on 160 meters. At this point (fall, 2003), the project is well over 2 years old, and is still not totally complete. I can see the light at the end of the tunnel, and I can start to document the process and experience (before I forget it all!). Here's what you will find:
Background and History: How I selected the 6-element design.
80/40 Meter Vertical: The design and construction of the 80/40 meter trap vertical.
Band by Band Design: The basic design, on 160, 80, and 40 meters.
Site Preparation: Laying out the array, erecting the elements, setting the ground radials.
Obsessed with Loss: More comments about loss.
Control/Switching System: The microprocessor-based control box that switches bands and directions.
Phasing Networks: My approach to phasing network design.
EZDZ: The program I use to compute drive impedance values.
40 Meter Phasing Network: The 40 meter network design and implementation.
80 Meter Phasing Network: The 80 meter network design and implementation.
160 Meter Phasing Network: The 160 meter network design and implementation.
Array Symmetry and Clever Impedance Measurements: Some lessons learned about trying to rotate the array.
Using the Oscilloscope to Make Phased Array Measurements: Verifying phasing results with the oscilloscope.
RF Transmitting Component Q: A look at the Q of some of the phasing network components, and their power ratings.
Coaxial Cable Stub Q: Using coaxial cable stubs as inductors and capacitors, and the Q of those alternatives.
Conclusion: The end.
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| John, ON4UN, and Roger, ON6WU, Inspecting the Control/Switching System (May 2005) |
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