ABSTRAKSI: Broadband PLC adalah teknologi komunikasi yang memanfaatkan jaringan tenaga listrik sebagai media transmisi komunikasi pada frekuensi diatas 1 MHz. Komunikasi broadband PLC mampu memberikan laju data yang tinggi sehingga dapat digunakan untuk melakukan transfer sinyal video. Pengiriman sinyal video melalui kanal Broadband PLC mengalami noise saluran tenaga listrik dan redaman yang cukup besar sebagai karakteristik saluran PLC. Karena itu, dibutuhkan sistem transmitter dengan noise rendah, bandwidth yang lebar dan mampu menjaga level daya sinyal informasi untuk dikirimkan melalui kanal PLC.
Sistem transmitter pada penelitian terdiri dari 4 blok yaitu modulator, kopling, penguat daya dan filter. Modulator memiliki karakteristik mampu mengubah sinyal video menjadi sinyal termodulasi agar tidak rusak saat dikirimkan. Kopling memiliki karakteristik bandwidth lebar (diatas 1 MHz) dan mampu menginjeksi sinyal informasi masuk ke kanal poweline. Penguat memilki karakteristik low noise sehingga sinyal tidak rusak ketika dikuatkan. Filter memiliki karakteristik menahan sinyal power 50 Hz dan meneruskan sinyal informasi ke dalam kanal powerline.
Penelitian pada tugas akhir menghasilkan perancangan dan realisasi sistem transmitter sinyal video melalui kanal broadband PLC. Pengujian kinerja dan kelayakannya pada frekuensi 10MHz-14MHz. Modulator mampu memodulasi sinyal video menjadi sinyal FM dengan frekuensi 11.5MHz-13.5MHz. Kopling mampu menginjeksi sinyal informasi ke kanal PLC. Penguat daya memiliki penguatan sinyal 10dB sehingga sinyal mampu dikirimkan ke kanal PLC. Filter memiliki bandwidth 30MHz sehingga mampu meneruskan sinyal informasi kedalam kanal PLC.Kata Kunci : broadband PLC, transmitter, video analog, bandwidthABSTRACT: Broadband PLC is a technology that use the powerline network as media transmission on frequency above 1 MHz. A communication with broadband PLC is able to provide high data rate that can be used to transfer video signals. On transmitting video signals through PLC channel has a powerline noise and attenuation are quite large as the PLC channel characteristics. Therefore, it is needs a transmitter system with low noise, has a wide bandwidth and capable to keep signal information power level to be transmit via the PLC channel.
Transmitter system in the research consists of 4 blocks that is modulator, coupling, power amplifier and filter. Modulator has a characteristics of being able to convert the video signal to the modulated signals for minimalize damaged in transmission. Coupling has characteristics wide bandwidth (up to 1 MHz) and capable as information signal injection to entering powerline channel. Power amplifier have the characteristics of low noise so that the signal is not damaged when strengthened. Filter has a characteristic to hold 50 Hz power signal and forward information signal into powerline channel.
The results of the final project is the design and realization of the video signal transmitter system through a broadband channel PLC. Testing the performance and feasibility on frequency 10MHz-14MHz. Modulator is able to modulate the video signal into FM signal with a frequency of 11.5MHz-13.5MHz. Coupling capable as information signal injection to the PLC channel. Power amplifier has 10dB signal gain so that the signal is able to be sent to the PLC channel. Filter has 30MHz of bandwidth, and is able to pass the information signal into the PLC channel.Keyword: broadband PLC, transmitter, video analog, bandwidth