Antennas for Restricted
Space
Why?
To Understand Why….
To Understand Why….
Cont’d
Initial Goals
EZNEC –Main Window
EZNEC Example
Phase 1 Solution
–
Bent Carolina Windom
Dimensions of C.Windom
C.Windom Performance
SWR and Feedpoint Effects
80m Modification
–
Bent Carolina Windom
80m Modification
Current Distribution—80m
80m Azimuth Plot
80-10m Results
(100 Watts)
160 Meter???
160m Project
Model #1
160m #1 Front View
160m #1 Side View
EZNEC Model #1
Elevation Gain – 8ft 160m
Results with Model #1
Design Goals for Model #2
Auto Tuned 160m Antenna
Major Tasks and Project Flow
Auto Tuned 160m Antenna
Major Tasks and Project Flow
Auto Tuned 160m Antenna
Major Tasks and Project Flow
Radiation Efficiency
160m #2 Front View
160m #2 Side View
160m 12 ft Simple Model
Elev. Pattern –Simple
Model
SWR – Simple Model 12 ft
12 ft 160m Model w/ Roof
12 ft 160m Vertical SWR
12 ft 160m Elev Pattern
Gain Comparisons
K5NA
The Farm --1
The Farm --2
AUTOTUNER
FUNCTIONAL OVERVIEW
AUTOTUNER
FUNCTIONAL OVERVIEW
AT External Unit
External Unit Schematic
AT Internal Mechanism
AT Inside View
AT Inside View
AT Input End Cap
PIC Controller PCB
Schematic
PIC PCB
Relay PCB Schematic
Relay PCB
Controller in LDG ATU
ATU Front View
PIC MPLAB IDE
N5TW 160M Challenge
Success with Small LF
Ants.
Ice? – No Problem!