Summit Radio Maintenance and Summit Radio Maintenance and IF Motor Testing IF Motor Testing

By: Blake SteneBy: Blake Stene

Akamai InternshipAkamai Internship

W.M. Keck ObservatoryW.M. Keck Observatory

Mentor: Jason ChinMentor: Jason Chin

Home Institution: Hawai’i Community CollegeHome Institution: Hawai’i Community College

ProjectsProjects

Radio Repair and Radio Repair and MaintenanceMaintenance

Testing IF MotorsTesting IF Motors

Collecting RMS Collecting RMS Data on IF Data on IF MotorsMotors

Photo Taken From: http://www.radioshack.comPhoto Taken From: http://www.radioshack.com

How Did I Get Things Done?How Did I Get Things Done?

PlanningPlanning

Setting Goals Setting Goals

Execute the Plan Execute the Plan

Collecting DataCollecting Data

Getting ResultsGetting Results

Mauna KeaMauna Kea W.M. Keck Observatory W.M. Keck Observatory

is at 13,600 Feet in is at 13,600 Feet in ElevationElevation

Radios were checked at Radios were checked at the summit in the clean the summit in the clean roomroom

Radios are important Radios are important Safety feature for all Safety feature for all personnel personnel

Radios are used at the Radios are used at the summit for summit for communication communication between summit between summit personnelpersonnel

Photo Courtesy: Michael CooneyPhoto Courtesy: Michael Cooney

Repairing and Maintaining RadiosRepairing and Maintaining Radios Motorola HT750 and SP50Motorola HT750 and SP50

I used an analyzer to I used an analyzer to check radios check radios

(CTCSS) Continuous Tone (CTCSS) Continuous Tone Coded Sub-audible Coded Sub-audible Squelch or (PL) Private Squelch or (PL) Private Line. (I used my scanner Line. (I used my scanner for this)for this)

Microphone SensitivityMicrophone Sensitivity

Received Signal Received Signal

Power Output (Watts) Power Output (Watts)

Updated the Database Updated the Database

Photos Taken From: Photos Taken From: http://www.commusa.com/catalog.aspx/motorola.HT750http://www.commusa.com/catalog.aspx/motorola.HT750

Transmit Audio

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45

Radio #

TX (

µV)

Power Output

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47

Radio #

Wat

ts

StatusStatus

52 Radios Checked52 Radios Checked

43 Radios Working Fine43 Radios Working Fine

9 Radios Out of Service (Need Servicing) 9 Radios Out of Service (Need Servicing)

3 New (HT750) Radios are Missing3 New (HT750) Radios are Missing

8 Old (SP50) Radios are Missing8 Old (SP50) Radios are Missing

Some of the ProblemsSome of the Problems Dirty Speakers (Metal Dirty Speakers (Metal

Shavings)Shavings)

Clean Radio (Oil Incident)Clean Radio (Oil Incident)

Solder CracksSolder Cracks

Power Output (Watts)Power Output (Watts)

Missing Channel KnobMissing Channel Knob

Low TX & RX AudioLow TX & RX Audio (TX Audio 0.3µV Normal)(TX Audio 0.3µV Normal)

Things I Learned Things I Learned Analyzer Analyzer Power (Watts)Power (Watts)

RX and TX Sensitivity RX and TX Sensitivity

Sensitivity of Microphone Sensitivity of Microphone

CTCSS or PLCTCSS or PL

Solder Cracks Solder Cracks

Database Database

Graphs Graphs

Photos Courtesy: Michael CooneyPhotos Courtesy: Michael Cooney

Actuator 850 MotorsActuator 850 Motors

I used the Pewin 32 programI used the Pewin 32 program

Actuators are used to adjust for Actuators are used to adjust for the error in mirrors the error in mirrors

I collected data on each motor to I collected data on each motor to document the limitsdocument the limits

I changed the software limits so I changed the software limits so that I could hit the position that I could hit the position limitslimits

I checked the software and I checked the software and position limits + and –position limits + and –

I recorded the data on ExcelI recorded the data on Excel

2 broken motors will be sent in 2 broken motors will be sent in for repairfor repair

Photo Courtesy: Michael CooneyPhoto Courtesy: Michael Cooney

RMS DataRMS Data

Motor RMS Data

0

100

200

300

400

500

600

700

Motor Name

RMS

Motor 1

LIN 4 P2

PMAC 4-8

PMAC 4-8

Pol 2 P4-M4

CTP Pol1

CTP-Pol2

CTS Po P2 M5

CTS Pol P2-M8

KAT DCR1 P4 M1

FAT PRSM P2 M1 0

FAT FLT P2 M2 0

LIN 1 P4 M6

LIN 2 P4 M7

LIN 3 P2 M6

MahaloMahalo Mentor: Jason ChinMentor: Jason Chin

Eric ApplebyEric Appleby

Sarah AndersonSarah Anderson

Ed WetherellEd Wetherell

Malika Moutawakkil Bell Malika Moutawakkil Bell

W.M. Keck Observatory W.M. Keck Observatory

Hawai’i Community CollegeHawai’i Community College

This project is supported by the National Science Foundation This project is supported by the National Science Foundation Science and Technology Center for Adaptive Optics, managed by Science and Technology Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative the University of California at Santa Cruz under cooperative agreement No. AST – 9876783.agreement No. AST – 9876783.