HARDWARE DESIGN AND IMPLEMENTATION OFLONG RANGECOMMUNICATION SYSTEM FOR RURAL AREA

• Main Author: Kompiang Gede Wirahita P., I
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55210
• Institution: Institut Teknologi Bandung

The government through the Ministry of Communication and Information stated that until now, Indonesia's geographical condition is still a big challenge in realizing equitable of connectivity and cellular network coverage to remote or rural areas. In fact, connectivity in rural areas has the same urgency as in urban areas because rural areas are usually the location for placing critical sensors related to disaster monitoring and climatological aspects that are usually owned by BMKG. Meanwhile, until now, several BMKG sensors in rural areas still use GSM cellular networks even though they do not have good signal coverage so that real-time data delivery is constrained. Therefore, to overcome these problems in this final project, a point-to-point simplex communication system (transmitter & receiver) is designed and implemented with 1200 bps bitrate FSK modulation for data communication. The communication channel used is at a frequency of 433 MHz with a bandwidth of 10.3 kHz, and 921 MHz with a bandwidth of 10.5 kHz. In order to cover long communication distance, the transmitter on the communication system is equipped with power amplifiers that capable of producing a maximum output power of 35.17 dBm for 433 MHz, and a maximum output power of 36.41 dBm for 921 MHz. To meet the ITU-R spurious emission standards, the transmitter is also equipped with a band-pass filter for 433 MHz (BW = 23.514 MHz, VSWR = 1.425, Insertion Loss = 4.347 dB) and a bandpass filter for 921 MHz (BW = 27.893 MHz, VSWR = 1.429, Insertion Loss = 6.722 dB). The final product of the transmitter has a maximum output power of 30.99 dBm for 433 MHz & 28.9 dBm for 921 MHz with a spectrum that already meets ITU-R spurious emission standards. The farthest distance that has been tested with transmitter and receiver devices is as far as 450 meters and the maximum BER value is 1.7857% for 63 bytes of data transmission.