Penghantaran Data Melalui Saluran VHF
The scope of this project is the data transmission over VHF link. The main emphasise of this project is to find suitable digital modulation technique for VHF transmission. VHF is the radio frequency ranging from 30MHz to 300MHz. VHF frequencies' propagation characteristics are ideal for sh...
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| Format: | Monograph |
| Language: | English |
| Published: |
Universiti Sains Malaysia
2006
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| Online Access: | http://eprints.usm.my/58761/ http://eprints.usm.my/58761/1/Penghantaran%20Data%20Melalui%20Saluran%20VHF_Noor%20Shazrah%20Mohamad.pdf |
| Summary: | The scope of this project is the data transmission over VHF link. The main
emphasise of this project is to find suitable digital modulation technique for VHF
transmission. VHF is the radio frequency ranging from 30MHz to 300MHz. VHF
frequencies' propagation characteristics are ideal for short-distance terrestrial
communication, with a range generally somewhat farther than line-of-sight from the
transmitter. VHF is also less affected by atmospheric noise and interference from
electrical equipment than low frequencies. The main objective from this project is to
design VHF radio modem. Preliminary study need to be carried out to achieve the project
objective. After the study the transmitter, receiver and control circuit would be designed.
Control circuit is needed to interface with the voltage divider circuit to get the suitable
value as data input for FSK encoder circuit. The clamper circuit is used raise the DC
voltage level of the input data logic “0” to 1volt. The circuit was designed using ORCAD
software. The circuit was fabricated and tested. |
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