WEEK 4 FYP

Objectives   : o To study about wireless system
                    o To study about transceiver (Transmitter & Receiver)
                    o To study about Radio Frequency (RF)
Activities     : On this week, i have study and do some research about the wireless system, RF transmitter & RF receiver. It is because in my project, i use this RF features to create a wireless network. I can change the frequency according to the required distance by using RF (Radio Frequency) system.
Analysis      : The details of my research are shown above:

 WIRELESS, TRANSCEIVER & RF:

Wireless

The word wireless is dictionary defined as "having no wires". In networking terminology, wireless is the term used to describe any computer network where there is no physical wired connection between sender and receiver, but rather the network is connected by radio waves and/or microwaves to maintain communications.

Transceiver

Transceiver is short for transmitter-receiver, a device that both transmits and receives analog or digital signals. The term is used most frequently to describe the component in local-area networks (LANs) that actually applies signals onto the network wire and detects signals passing through the wire. For many LANs, the transceiver is built into the network interface card (NIC). Some types of networks, however, require an external transceiver. In Ethernet networks, a transceiver is also called a Medium Access Unit (MAU). In radio communications, a transceiver is a two-way radio that combines both a radio transmitter and a receiver that exchanges information in half-duplexmode.

RF (Radio Frequency)

Short for radio frequency, any frequency within the electromagnetic spectrum associated with radio wave propagation. When an RF current is supplied to an antenna, an electromagnetic field is created that then is able to propagate through space. Many wireless technologies are based on RF field propagation. These frequencies make up part of the electromagnetic radiation spectrum:

• Ø  Ultra-low frequency (ULF) -- 0-3 Hz
• Ø  Extremely low frequency (ELF) -- 3 Hz - 3 kHz
• Ø  Very low frequency (VLF) -- 3kHz - 30 kHz
• Ø  Low frequency (LF) -- 30 kHz - 300 kHz
• Ø  Medium frequency (MF) -- 300 kHz - 3 MHz
• Ø  High frequency (HF) -- 3MHz - 30 MHz
• Ø  Very high frequency (VHF) -- 30 MHz - 300 MHz
• Ø  Ultra-high frequency (UHF)-- 300MHz - 3 GHz
• Ø  Super high frequency (SHF) -- 3GHz - 30 GHz
• Ø  Extremely high frequency (EHF) -- 30GHz - 300 GHz