Antenna Controller

1
Antenna Controller

• ECE 4542-01 Senior Design II
• Mississippi State University
• February 28, 2005

2
Team Assignments
3
Team Assignments
4
Team Assignments
5
Team Assignments
6
Team Assignments
7
Team Assignments
8
Presentation Outline

• Project Overview
• Timeline
• Results

9
Presentation Outline

• Project Overview
• Timeline
• Results

10
Presentation Outline

• Project Overview
• Timeline
• Results

11
Presentation Outline

• Project Overview
• Timeline
• Results

12
Project Overview
13
Background

• 3.5 30MHz
• Screwdriver antenna
• External controller

14
Problem

• Not very accurate
• Requires monitoring
• Manual tuning unsafe while driving

15
Current Technology
16
Timeline
17
Timeline
18
Results
19
Battery 13.8 V
Motor
Controller
HF Transceiver
50 ?
20
Technical Design Constraints

• Tuning Accuracy
• /- 2 inductor turns will provide tuning
  consistency
• Voltage Regulation
• 8-16 volts will produce 5 volts
• RF Exposure
• Operational when radiating 100 watts of RF
• Relay Specifications
• Will pass 5 amps for 1 antenna cycle

21
Tuning Accuracy

• Manually position antenna
• Mark position on antenna
• Save position in memory
• Move to random position
• Recall position

22
Tuning Accuracy
23
Tuning Accuracy
24
Voltage Regulation

• Vary input from 8-16 Volts
• Measure output voltage

25
Voltage Regulation
26
RF Test Procedure

• Setup controller
• Tune antenna, radiate 25, 50, and 100 W
• Save location and move antenna
• Return to saved location

27
RF Results
28
RF Results
29
RF Results
30
Relay Specifications

• Connected relay to 12 and 2.4? load
• Tested for 5 minutes (2X cycle time)

31
Sustainability
32
Product Sustainability

• Mechanical relays
• Susceptible for failure
• Main factor in life of product

33
Relay Life

• Life expectancy 110,000 ops _at_ 5 Amps
• Estimated 20 ops/day 7300 ops/year

34
Relay Life

• Life expectancy 110,000 ops _at_ 5 Amps
• Estimated 20 ops/day 7300 ops/year

35
Packaging
36
Dimensions

• Depth 1.3

37
Projected Costs
38
Acknowledgements

• Mr. Martin F. Jue
• Dr. J. Patrick Donohoe
• Mr. Harry Wong
• Mr. Joaquin Bonilla
• Mr. Carlous Perry

39
Questions?