3. Method

Equipments needed

  • 2 x iPhone 5S(One to call the other phones)
  • 1 x Samsung Galaxy Trend 3
  • 1 x Samsung Galaxy S3
  • 1 x Macbook
  • 1 x Copper wire (30 cm)
  • 1 x Voltage Sensor
  • 1 x OA91 Diode
  • 1 x Light-Emitting Diode2(LED)
  • 1 x Breadboard(For the stability of the circuit) (Optional)

  

Testing the Setup

In order to ensure that the experimenting/data collecting works fine, we first need to test the setup to make sure the circuit is working fine

In order to do so, we need to ready the circuit
  1. To do so, attach the positive terminal of the LED to one of the points of the breadboard. (Let us call that Row A Column A, for technical reasons)

  1. Next, attach the negative terminal of the LED to another point on the breadboard. (Let’s call that Row A Column B)

  1. Attach the negative terminal of the diode to another row of Column B

  1. Attach the positive terminal of the diode to another point on the breadboards. (Let’s call that Row A Column C)

  1. Cut the wire into 2 equal pieces.

  1. “Shave” the ends of the copper wire to remove the insulating layer.

  1. Attach one of them to any of the rows in Column A except the ones occupied, and the other piece to any row of Column C, except the ones occupied. Now the set-up is complete.

After that, put a phone on the setup and call it with another phone. When the phone is ringing the bulb should light-up; and if it does, then the test is working. Now onto the genuine experimenting.
Screen Shot 2015-03-02 at 10.51.04 pm.png
Figure 5.1 LED Light Lighting up

Procedure

  1. First ready the circuit
    1. To do so, attach the positive terminal of the OA91 diod to one of the points of the breadboard. (Let us call that Row A Column A, for technical reasons)

    1. Next, attach the negative terminal of the OA91 to another point on the breadboard. (Let’s call that Row A Column B)

    1. Cut the wire into 2 equal pieces.

    1. “Shave” the ends of the copper wire to remove the insulating layer.

    1. Attach one of them to any of the rows in Column A accept the ones occupied, and the other piece to any row of Column B, accept the ones occupied. Now the set-up is complete.

  1. Set the phone(s) to GSM Mode Only.

  1. Put the SIM card (900MhZ , 1800MhZ or 2100MhZ for M1 Only) inside the phone.

Figure 6.1f

  1. Then place the phone on the breadboard, horizontal, relative to the ground.

  1. Then connect the negative terminal of the circuit to one of the crocodile clips connected to the Voltage Sensor.

  1. Connect the positive terminal of the circuit to the other crocodile clip.

  1. Call the phone from an external transmitter (another phone).10934493_794136080633814_488348055_n.jpg
Figure 6.3/6.4
  1. Record the data by inserting a thumb drive into the Voltage Sensor.

  1. Do steps 2-8 until all phones have been tested.

  1. Next, do steps 2-9, just that the phone on the setup is calling this time. A total of 3(No. of phones) • 3(3 tests to ensure accuracy for each phone)•2(Phone transmitting and receiving) = 18 tests should be done.

Data Analysis
  1. Collect the data through the Voltage Sensor.

  1. Open up using Logger Lite (Application)

  1. Scale the graph until you can see a cycle by itself.

  1. Note the time taken for one graph and measure the frequency.

1/(Time Taken)


Figure 7.1 [File:Light Spectrum.svg]

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