PROCEDURES

Safety Considerations


Electrical Power Safety

1. Limit the use of high power devices around water.

2. Never use frayed or cut wires when plugging in a device.

3. Never overload the outlet and use a surge protector.

4. All electrical devices should have an emergency cut off switch or ‘kill’ switch.

5. Shut off and unplug all devices when not in use or when you leave the room unattended.

6. Review and check all of the connections twice before applying any power.


Set Up #1

1. Gather all of the equipment and other materials needed for the testing.

2. Plug in all of the equipment: Power Supplies, Transmitters, and Oscilloscope. Use the safety guidelines given for electricity.

3. Connect the Transmitters to a dummy load and combiner (See Block Diagram). Then turn on the equipment.

4. Adjust the settings on all of the necessary equipment so that it’s ready for experimentation and verify all of the cable routing.

5. Determine the frequencies that will be transmitted for each run of the experiment.


Data Collection #1

1. Tune both of the transmitters to the same or different frequencies, or channel (MHz) chosen for experimentation.

2. Key microphone #1 to transmit with transmitter #1.

3. Record the data (combiner output) on the oscilloscope.

4. Key microphone #2 to transmit on transmitter #2.

5. Record the data (combiner output) on the oscilloscope.

6. Key microphone #1 and microphone #2 to transmit on transmitter #1 and #2.

7. Record the data (combiner output) on the oscilloscope.

8. Conduct steps 1-7 at least 3 times.

9. Now analyze the data and average it for graphing.

10. Use a computer program to simulate the results for a better understanding. Use mathematics to prove and verify results.


Set Up #2

1. Connect Computer #1 headphone output to Computer #2 microphone input.

2. Start the Wave Generator software on computer #1.

3. Start the Oscilloscope/Spectrum Analyzer software on Computer #2.

4. Start a 1000 Hz tone generation on Computer #1 at –35 dB.

5. Adjust the Oscilloscope controls (Time/Division and Volts/Division) to display the 1000 Hz wave.

6. Adjust the Spectrum Analyzer controls (Frequency/Division and Power (Volts)/Division) to display the 1000 Hz wave.


Data Collection #2

1. Set the wave generator for the selected wave(s)’ types, frequencies, and powers.

2. Once the correct wave property values have been entered, press play to start the wave generation.

3. Adjust the Oscilloscope controls (Volts/Division and Time/Division) for a reasonable display. Record the resultant waveform by measuring the peak value using the cursor. (Oscilloscope).

4. Adjust the Spectrum Analyzer controls (Frequency/Division and Volts/Division) for a reasonable display. Record the resultant Spectrum Analysis by measuring the peak value using the cursor (Spectrum Analyzer).

5. Repeat steps 1-3 for each waveform or waveform set.


Data Analysis

Descriptive Statistics

1. Data will first be organized in a data table bases on groups or variables.

2. The mean or average for each group or variable tested will be calculated.