亀岡高校地学倶楽部

　　　　　　　　　　　　　　　　　　 　 　 　 　 　

Akira　Computer　Systems　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 　

　 　 　 　 　　　　　　　 Keizo　NONAKA 　 　 　 　 　　 　 　 　 　 　 　

What Students Can Learn What Students Can Learn From Making the Radio TelescopeFrom Making the Radio Telescope

The Report The Report from Kameoka High School from Kameoka High School

Keizo NONAKA at GHOU2007

　　 　 　 　　　

　 　 　 　 　 　 　

AimAim

•Based on the activities in 2006•Making the radio telescope like making optical telescopes by students•Day time usage•Observing 21[cm] Emission from Hydrogen in the Milky way. Frequency = 1420.405 [MHz]

Keizo NONAKA at GHOU2007

JAHOU The RadioJAHOU The Radio CurriculumCurriculum

Chapter I : basics

Kinetic energy to receivers

Chapter II : observation

Equipment and observation

Chapter III : Analysis

Understand the meanings

Keizo NONAKA at GHOU2007

In the year of 2006In the year of 2006

Keizo NONAKA at GHOU2007

Draw　the　picture　of　　oscillation　→propagation→receiving

Keizo NONAKA at GHOU2007

The fundamentals of radio receivers

Keizo NONAKA at GHOU2007

Resonant circuit

Energy stored Energy storedin in

Magnetic fields Electric fields

Energy, via current, swings between two components like a pendulum.

Filtering the frequency that we need　

Keizo NONAKA at GHOU2007

Keizo NONAKA at GHOU2007

Keizo NONAKA at GHOU2007

In the year of 2007In the year of 2007

Let us make the real radio telescopeLet us make the real radio telescope

Keizo NONAKA at GHOU2007

The Earth Science Club at Kameoka HighThe Earth Science Club at Kameoka High

7 boys 17 to 18 years old

Keizo NONAKA at GHOU2007

The model of oscillatorThe model of oscillator

　

Keizo NONAKA at GHOU2007

The model of receiverThe model of receiver

Keizo NONAKA at GHOU2007

Keizo NONAKA at GHOU2007

SystemsSystems

1. Receiving

2. Pursuer

3. Frequency Analysis

Keizo NONAKA at GHOU2007

Receiving SystemsReceiving Systems

• Reflector• Horn• Receiving element• Booster• Frequency down converter

Keizo NONAKA at GHOU2007

Carve Calculations for the reflector Carve Calculations for the reflector

Keizo NONAKA at GHOU2007

variablesvariables

• Frequency 　 1420.40 [MHz]• Diameter 　 2000.00 [mm]• Vignetting factor 　 50.00 [%]• f/D 　 0.50 • Focal length 　 1000.00 [mm]• Angular aperture 106.26 °• Gain 26.43 [dbi]

Keizo NONAKA at GHOU2007

PointingPointing

Keizo NONAKA at GHOU2007

BendingBending

Keizo NONAKA at GHOU2007

The horn The horn

Keizo NONAKA at GHOU2007

AssemblyAssembly

Keizo NONAKA at GHOU2007

Frequency Down ConverterFrequency Down Converter

Keizo NONAKA at GHOU2007

　　 Frequency AnalysisFrequency Analysis

•Amplitude in the frequency domain

•Spectrum analyzers are expensive

Keizo NONAKA at GHOU2007

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　ｆｉｎｅｄ　　　　　　　　　　　　　　　　　　　　　　　　　　　 　Ｒａｄｉｏ

Sign　waves　can　be　rewritten　in　the　complex　spin　movement

The　Fast　Fourier　Transfer　gives　Amplitude

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Keizo NONAKA at GHOU2007

Keizo NONAKA at GHOU2007

Things to do Things to do

• Booster• Pursuer system• Inexpensive Software Defined Radio • The First Light

Keizo NONAKA at GHOU2007

InvestmentInvestment

90,000 JPY750 USD660 Euro

So far

Keizo NONAKA at GHOU2007

　 　 　 　　 　 　 　　 　 　 　 　

The ProblemsThe Problems

• Hand craft takes time• Backup theories• Long term activities• Finance

Keizo NONAKA at GHOU2007

WhatWhat 　 Ｓ　 Ｓ tudents tudents ＣＣ an an ＬＬ earnearn

• Feasibility based on Try and Error• Technology for Science • Hand craft• Electronics• Team work

Keizo NONAKA at GHOU2007

Special ThanksSpecial Thanks

Dr. Okyudo Wakayama U. 　 Mr. Tanaka ham operator Chevron Electronics Company