Transcript Crystal Radio

By Nicky Godoff
6th Grade
2nd Quarter
Robert Louis Stevonson
Middle School
Controlled variablesthe same place; my
backyard.
Experimental
variables-Using a
crystal radio and a
regular radio.
Radio Frequency Identificationfinding how many radio waves
are being detected in the area.
Crystal Radio- A radio that
usually uses a crystal rod
antenna.
Question and Hypothesis
Question- Can a crystal radio pickup more
radio stations than a regular radio?
Hypothesis- If a crystal radio picks up
more radio stations, then this proves that a
crystal radio can pick up more radio
stations.
I think that the crystal radio can pick up
more radio stations because the antenna
is longer than the regular radio antenna.
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7dk of 40cm of spooled wire.
2 ½ cm 34 Diode.
1 47k watt resistor.
1 hi impedance ceramic speaker
1 wood board.
1 regular radio.
Procedure
A.
B.
C.
D.
E.
Get materials.
Build crystal radio.
Set up the observation table.
Get both radios set up outside. Test
hypothesis on two different days.
Draw conclusion.
Dates
11/25
Crystal Radio
Has less radio
stations.
11/27
It picked up
more stations.
Regular Radio
Has twice as
much radio
stations.
It still had more
radio stations.
Crystal Radio VS. Regular
Radio
80
The graph
shows how
much radio
stations are
being detected.
70
60
50
40
Crystal Radio
Regular Radio
30
20
10
0
11/25/2010
11/26/2010
11/27/2010
In my experiment the crystal radio did not
pick up as much radio stations as the
regular radio.
The crystal radio picked up less radio
stations, the radio had at least twice as
much more radio stations.
The results weren’t much different on the
trails.
My hypothesis was incorrect, the crystal radio
only picked up 34-38 radio stations. The regular
radio picked up 72-79 radio stations.
If I would do the project again I would have
built the crystal radio better and have a longer
antenna.
I recommend this project to people that have a
lot of time, because the crystal radio is hard to
build.
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Matolak, David W. “Radio Frequency
Identification .”World Book, 2010. Web. 2
Nov. 2010.
Halper, Donna L., & David W. Matolak.
“Radio.” World Book, 2010. web. 2 Nov.
2010.
Special thanks to my dad for getting the
materials and helping me with the project
Also to Mr. Pham!!!!