Notes 23

comments

1-The same hardware is required for all types of wireless technology.

2-The hardware must take an electrical signal, put it on a carrier wave, and convert it into an RF signal.

3-The signal is converted back into an electrical signal, separated from the carrier wave ant interpreted in some way.

4-This process is done using a transmitter, an antenna, and a receiver.

5-Each piece of hardware is used to complete a certain part of the process.



questions

1-What happens if one of the objects are missing?

2-Are there devices that carry out two functions?

3-Does an antenna's size affect its strength?

4-



words

1-Transceiver-a device that includes both a transmitter and a receiver.

2-Transmitter-a device that sends RF siganls carrying information.

3-Receiver-a device that receives info from an antenna and processes the info so that it can be used in some way.



summary

1-This section talks about how transmitters, receivers, and antennas work.

Notes 22

Comments

1-Information can be transmitted as radio, TV, voice, or data.

2-All info is transmitted as analog or digital.

3-Waves are analog because they are continuous.

4-Digital data piggybacks on analog waves to be transmitted.

5-Data is now mostly sent in digital format.

Questions

1-Why does digital data have to piggyback on analog data?

2-Why is data more commonly sent on digital waves now?

3-What causes analog data to turn into digital data?

4-Why must data be processed before being sent?

Words

1- Analog data-information represented as a continuous wave in which there can be infinite variations between two points.

2-Digital Data- Data represented as bits that are either on or off.

3-Noise-electromagnetic radiation.

Summary

1-This section talks about how data travels on wireless waves.

Notes 21

5 comments

-There are many different types of waves that carry

- I finally know what AM and FM stand for now.

- AM and FM work in different ways.

- AM is the earliest form of modulation.

- AM is more effected by interference than FM.

4 questions

-Are carrier waves in the air?

- What does AM stand for?

- What does FM stand for?

-

3 words

-Carrier wave- Wave the carries information through the air from one place to another.

- AM-amplitude modulation

- FM- frequency modulation

1 Summary

1- This part of the book talk about how AM and FM work.