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Automated Antenna Automated Antenna Controller Controller

Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

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Outline IntroductionIntroduction ProblemProblem SolutionSolution ConstraintsConstraints –Technical –Practical Special ConcernsSpecial Concerns –Manufacturability –Health and Safety System OverviewSystem Overview ProgressProgress TimelineTimeline QuestionsQuestions

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Page 1: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Automated Antenna ControllerAutomated Antenna Controller

Page 2: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Our TeamOur Team

Sam Bryan – Team LeaderSam Bryan – Team LeaderElectrical EngineerElectrical Engineer

Hardware PrototypingHardware PrototypingLCD CommunicationLCD Communication

Brandon Gray Brandon Gray Electrical EngineerElectrical Engineer

Hardware PrototypingHardware PrototypingFrequency Counting Frequency Counting

Jacob EdwardsJacob EdwardsComputer EngineerComputer Engineer

Microprocessor Microprocessor ProgrammingProgramming

Ashley StoughAshley StoughElectrical EngineerElectrical Engineer

LCD CommunicationLCD CommunicationFrequency CountingFrequency Counting

Dr. Raymond WintonDr. Raymond WintonAcademic AdvisorAcademic Advisor

SponsorSponsor

Page 3: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

OutlineOutline• IntroductionIntroduction• ProblemProblem• SolutionSolution• ConstraintsConstraints

– TechnicalTechnical– PracticalPractical

• Special ConcernsSpecial Concerns– ManufacturabilityManufacturability– Health and SafetyHealth and Safety

• System Overview System Overview • ProgressProgress• TimelineTimeline• QuestionsQuestions

Page 4: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

What is the Automated Antenna What is the Automated Antenna Controller?Controller?

– Microprocessor controlled version of MFJ Microprocessor controlled version of MFJ Enterprises, Inc.’s user-managed loop Enterprises, Inc.’s user-managed loop antenna controller antenna controller

– Used with MFJ-1786 and MFJ-1788 Super Used with MFJ-1786 and MFJ-1788 Super Hi-Q Loop Antennas Hi-Q Loop Antennas

[1][1]

Page 5: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

What is the Automated Antenna What is the Automated Antenna Controller?Controller? (cont’d) (cont’d)

• Unit controls a motor attached to a variable plate capacitor Unit controls a motor attached to a variable plate capacitor which adds capacitance to the impedance of the loadwhich adds capacitance to the impedance of the load

• Standing Wave Ratio (SWR)Standing Wave Ratio (SWR)– Ratio of power or impedance: Ratio of power or impedance:

• Power reflected to source versus power transmitted Power reflected to source versus power transmitted from sourcefrom source

• Load impedance against source impedanceLoad impedance against source impedance

Page 6: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Problems with Existing ControllerProblems with Existing Controller

• Operation is Time ConsumingOperation is Time Consuming• Unit is Difficult to OperateUnit is Difficult to Operate• Meter is Difficult to Read AccuratelyMeter is Difficult to Read Accurately• Inaccurately controlledInaccurately controlled

[2][2]

Page 7: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

SolutionSolution

• Use microcontroller to allow more accurate Use microcontroller to allow more accurate tuningtuning

• Automate the tuning process to avoid user Automate the tuning process to avoid user errorerror

• Utilize digital display to allow easier output Utilize digital display to allow easier output for userfor user

Page 8: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Technical ConstraintsTechnical ConstraintsNameName ConstraintConstraintFrequencyFrequency Frequency must measure and display between 7 and Frequency must measure and display between 7 and

30MHz ± 30kHz. 30MHz ± 30kHz.

Standing Wave RatioStanding Wave Ratio A maximum of 3:1 SWR must be achieved.A maximum of 3:1 SWR must be achieved.

ConnectorConnector RF connection must be an SO-239 style connector. RF connection must be an SO-239 style connector.

RF PowerRF Power Forward and reflected power must be measured and Forward and reflected power must be measured and displayed accurately to ± 1W. displayed accurately to ± 1W.

Power SupplyPower Supply Power supply must be the MFJ-1312D AC adapter.Power supply must be the MFJ-1312D AC adapter.

Page 9: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Manufacturability: SizeManufacturability: Size• Large enough to accommodate analog and Large enough to accommodate analog and

digital displaysdigital displays• Within reason from previous model Within reason from previous model • Suggested Size: 4in x 7in x 7in. Suggested Size: 4in x 7in x 7in.

[3][3]

Page 10: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Health and SafetyHealth and Safety

• Enclose the controllerEnclose the controller– Prevent electric shockPrevent electric shock– Prevent burns from hot componentsPrevent burns from hot components– Prevent RF burnsPrevent RF burns

Page 11: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

System OverviewSystem Overview

Page 12: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

MicrocontrollerMicrocontroller

[4][4]

Previous Experience

Available from Manufacturer

PWM Ports Price

PIC 16 0 members Yes 1 $2.97

PIC 18F2520

4 members Yes 2 $3.98

Page 13: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

LCD LCD

Backlight Supplied by Manufacturer

Price

WH-1602B-NGB

No Yes 10.40

WH-1602B-GGE

Yes, Green

Yes 10.40

Page 14: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

SWR MeasurementSWR Measurement

[6][6]

[7][7]

IndirectIndirect

DirectDirect

Page 15: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

SWR Measurement (cont’d)SWR Measurement (cont’d)

Effect on transmission line

Frequency dependency

Output

Indirect None Independent Representative voltage

Direct Introduces impedance

Dependent Representative voltage

Page 16: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

TimelineTimeline

Month August September October November

Research

Hardware Prototyping

Programming

Testing

Operational Prototype

Page 17: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

ProgressProgress• PrototypingPrototyping• TestingTesting

Page 18: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

PrototypingPrototyping

Page 19: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

TestingTesting

Page 20: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Testing (cont’d)Testing (cont’d)

0

5

10

15

20

25

30

7.500 10.000 15.000 17.647 20.000 25.000 30.000

Frequency (MHz)

Stan

ding

Wav

e Ra

tio

Low Power

10 W

40 W

70 W

100 W

Page 21: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

SummarySummary• ProblemProblem• SolutionSolution• ConstraintsConstraints

– TechnicalTechnical– PracticalPractical

• Special ConcernsSpecial Concerns– ManufacturabilityManufacturability– Health and SafetyHealth and Safety

• System Overview System Overview • Trade-offsTrade-offs• TimelineTimeline• ProgressProgress

Page 22: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

References References [1]http://www.mfjenterprises.com/Product.php?productid=MFJ-1786.[1]http://www.mfjenterprises.com/Product.php?productid=MFJ-1786.

[Online]. Accessed: September 29, 2009.[Online]. Accessed: September 29, 2009.[2]http://www.mfjenterprises.com/catalog/Pages_061-080.pdf [Online]. [2]http://www.mfjenterprises.com/catalog/Pages_061-080.pdf [Online].

Accessed: September 27, 2009.Accessed: September 27, 2009.[3]MFJ Enterprises, INC., [3]MFJ Enterprises, INC., MFJ Super Hi-Q Loop Antenna: Model MFJ MFJ Super Hi-Q Loop Antenna: Model MFJ

1786/1788 Instruction Manual1786/1788 Instruction Manual, 1997., 1997.[4]http://media.digikey.com/photos/Microchip%20Tech%20Photos/[4]http://media.digikey.com/photos/Microchip%20Tech%20Photos/

pic18f2520-i%20sp.JPG. [Online]. Accessed: September 30, 2009. pic18f2520-i%20sp.JPG. [Online]. Accessed: September 30, 2009. [5] “PIC18F2420/2520/4420/4520 Datasheet”, 2008. Microchip [5] “PIC18F2420/2520/4420/4520 Datasheet”, 2008. Microchip

Technology Inc. pg 326.Technology Inc. pg 326.[6]http://vk1od.net/transmissionline/VSWR/VSWRMeter.htm. Owen [6]http://vk1od.net/transmissionline/VSWR/VSWRMeter.htm. Owen

Duffy 1995, 2006Duffy 1995, 2006 [Online]. Accessed: October 6, 2009.[Online]. Accessed: October 6, 2009.[7] http://ludens.cl/Electron/swr/swr.html [Online]. Accessed: October 6, [7] http://ludens.cl/Electron/swr/swr.html [Online]. Accessed: October 6,

2009.2009.

Page 23: Automated Antenna Controller. Our Team Sam Bryan – Team Leader Electrical Engineer Hardware Prototyping…

Questions?Questions?