Abstract
To find out the location of an aircraft accident from an ELT signal beam of 121.5 MHz, search and rescue (SAR) officers or civil aviation authorities need an ELT signal receiver device that works at the same frequency, which is 121.5 MHz. The purpose of this research is to produce an ELT signal receiver with direct receiver method at a frequency of 121.5 MHz which is simpler, requires fewer RF devices, and is according to specifications for civil aviation. In this research, the design and realization of ELT signal receivers are carried out using the direct receiver method, including: a BPF and a RF amplifier as a direct receiver circuit, an AM demodulator, and an audio amplifier. Based on the results of measurements and tests that have been done, the direct receiver circuit can receive an ELT signal at a frequency of 121.5 MHz in the range of 121.330 to 121.617 MHz with -40.35 dB sensitivity, the AM demodulator can demodulate the audio signal at a frequency of 346.6 Hz, and the audio signal at a frequency of 337.6 Hz as a pointer to an ELT signal can be heard through the loudspeaker. The results of this study are ELT signal receivers with direct receiver method at a frequency of 121.5 MHz which are according to specifications for civil aviation.
Highlights
Abstrak— Untuk mengetahui lokasi terjadinya kecelakaan pesawat terbang dari adanya pancaran sinyal emergenc y l oc ator transmitter (ELT) sebesar 121,5 MHz, petugas searc h and resc ue (SAR) atau otoritas penerbangan sipil memerlukan perangkat penerima sinyal ELT yang bekerja pada frekuensi sama, yaitu sebesar 121,5 MHz
c ivil aviation authorities need an ELT signal receiver device that works at the same frequenc y
is acc ording to spec ifications for c ivil aviation
Summary
Kecelakaan pesawat terbang dalam fase penerbangan, karena faktor cuaca ataupun kondisi pesawat terbang bisa terjadi dimanapun baik di atas daratan maupun lautan. Beberapa penelitian yang membahas tentang pengembangan dan aplikasi penerima ELT, antara lain: aplikasi masa depan arsitektur direct RF sampling (DRFS) pada perangkat ELT [8], ujicoba deteksi distress beacon UHF signal yang terpancar dari lokasi kecelakaan pesawat terbang oleh petugas SAR menggunakan Cospas-Sarsat System [9], penjejakan pesawat terbang yang mengalami kecelakaan menggunakan ELT berbasis Cospas-Sarsat System [10], dan desain web based module untuk SAR pada ELT receiver dengan sistem Cospas-Sarsat [11]. Lebih lan jut hasil penelit ian in i dapat digunakan untuk pengembangan pemancar dan penerima sinyal ELT, serta dapat juga diimplementasikan pada sistem pencari (locator) pesawat terbang dengan menambahkan perangkat radio direction finder (RDF) [20]
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