RANCANG BANGUN MODULASI DOPPLER TONE 500 HZ
PADA RADIO DIRECTION FINDER JALUR
VERY HIGH FREQUENCY
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Institusion
INSTITUT TEKNOLOGI DIRGANTARA ADISUTJIPTO
Author
RAMADAYANTI, DEWI
Subject
T Technology (General)
Datestamp
2024-03-27 05:15:12
Abstract :
Evacuation teams need a device that helps them communicate in an emergency such as a location with low signal. Radio Directional Finder (RDF) is a classic communication tool that is able to assist communication in areas that lack a GSM signal so as to facilitate the evacuation process in an emergency. On the other hand, Radio Direction Finder (RDF) is a tool that can detect the presence of a transmitter that is connected by utilizing the Doppler effect, so that it can help communicate in an emergency. In this RDF design using the Doppler concept with a frequency of 500 Hz which is modulated with a carrier frequency of 146 MHz. The 5 V received by the 8 kHz clock circuit outputs a frequency of 8 kHz. Then the 8 kHz frequency is forwarded to the binary counter circuit and divided into 2 at each output to Q0 = 4 kHz, Q1 = 2 kHz, Q2 = 1 kHz and Q3 = 500 Hz. The 4 kHz output is forwarded to the LED display then the 2 kHz and 1 kHz outputs are forwarded to the digital filter circuit. The 500 Hz output is forwarded directly to the multiplexer circuit and then forwarded to the antenna switcher to be modulated. From the results of the study showed the tool can function properly and the modulation process can run well. The frequency of 500 Hz which is output from the 1-of-4 data selector circuit is forwarded to the antenna switcher and rotated 500 revolutions / sec. When the 146 Mhz frequency is connected to the antenna, the 146 Mhz frequency will be played simultaneously with the 500 Hz Doppler frequency, so that when voice data is received and output to the external speaker, a shrill sound will be heard due to a shift from the 146 Mhz frequency and 500 Hz Doppler on the antenna. The shrill sound will change when the transmitter moves closer to or away from the antenna. Overall the tool can work in accordance with the theory learned.
Evacuation teams need a device that helps them communicate in an emergency such as a location with low signal. Radio Directional Finder (RDF) is a classic communication tool that is able to assist communication in areas that lack a GSM signal so as to facilitate the evacuation process in an emergency. On the other hand, Radio Direction Finder (RDF) is a tool that can detect the presence of a transmitter that is connected by utilizing the Doppler effect, so that it can help communicate in an emergency. In this RDF design using the Doppler concept with a frequency of 500 Hz which is modulated with a carrier frequency of 146 MHz. The 5 V received by the 8 kHz clock circuit outputs a frequency of 8 kHz. Then the 8 kHz frequency is forwarded to the binary counter circuit and divided into 2 at each output to Q0 = 4 kHz, Q1 = 2 kHz, Q2 = 1 kHz and Q3 = 500 Hz. The 4 kHz output is forwarded to the LED display then the 2 kHz and 1 kHz outputs are forwarded to the digital filter circuit. The 500 Hz output is forwarded directly to the multiplexer circuit and then forwarded to the antenna switcher to be modulated. From the results of the study showed the tool can function properly and the modulation process can run well. The frequency of 500 Hz which is output from the 1-of-4 data selector circuit is forwarded to the antenna switcher and rotated 500 revolutions / sec. When the 146 Mhz frequency is connected to the antenna, the 146 Mhz frequency will be played simultaneously with the 500 Hz Doppler frequency, so that when voice data is received and output to the external speaker, a shrill sound will be heard due to a shift from the 146 Mhz frequency and 500 Hz Doppler on the antenna. The shrill sound will change when the transmitter moves closer to or away from the antenna. Overall the tool can work in accordance with the theory learned.
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