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All Journal Jurnal Teknologi Elektro Angkasa: Jurnal Ilmiah Bidang Teknologi Jurnal Ilmiah Teknik Industri KURVATEK Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Jurnal Engine: Energi, Manufaktur, dan Material Indonesian Journal of Electrical Engineering and Computer Science Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
Diah Suwarti Widyastuti
Institut Teknologi Nasional Yogyakarta
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Desain Pemasangan Lightning Rod pada Hotel Kimaya Kota Yogyakarta Christina Manitik; Budi Utama; Diah Suwarti Widyastuti
Aviation Electronics, Information Technology, Telecommunications, Electricals, Controls (AVITEC) Vol 5, No 2 (2023): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v5i2.1741

Abstract

Penelitian ini bertujuan untuk mendesain pemasangan lightning rodsehingga diharapkan dapat secara optimal memproteksi bangunan hotel Kimaya Yogyakarta. Desain yang digunakan adalah dua dan empat lightning rod dengan menerapkan metode bola gelinding (Rolling Sphare Method) pada kedua desain tersebut dengan Amplitudo 10 kA. Hasil analisis antara dua dan empat lightning rod diperoleh kesimpulan bahwa kedua desain tersebut belum dapat memproteksi hotel secara optimal dari sambaran petir, maka dari itu perlu adanya penambahan dua tanduk pada sudut bangunan sehingga bola tidak menyentuh bangunan dan melindungi hotel dari sambaran petir. Area permukaan yang diciptakan oleh dua lightning rod adalah ± 6.082 m2,  area terproteksi yang diciptakan oleh empat lightning rod adalah ± 11.689 m2. Sedangkan dengan adanya penambahan dua tanduk pada sudut bangunan menciptakan area terproteksi seluas ± 13.684 m2.
VHF Doppler Radio Direction Finding Using an Eight-Element Switched Antenna Array Arif Basuki; Denny Dermawan; Diah Suwarti Widyastuti; Bagas Nur Susanto; Adi Setiawan
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4018

Abstract

Communication between radio transmitters and receivers is commonly evaluated based on signal quality, while the direction of arrival (DoA) of the signal is less frequently exploited in conventional communication systems. This study presents the design and preliminary field validation of a Doppler-based Radio Direction Finder (RDF) operating in the Very High Frequency (VHF) band using an eight-element switched antenna array. The proposed system applies a single-receiver pseudo-Doppler architecture in which eight antenna elements are sequentially switched to emulate virtual antenna rotation and generate a Doppler-modulated audio-frequency signal. The signal is processed through filtering, zero-crossing detection, and phase-based bearing estimation, and the resulting direction is displayed using a 16-segment circular LED indicator with 22.5° angular resolution. Field measurements were conducted at three locations in the 144–146 MHz band, with transmitter–receiver distances ranging from approximately 100 m to 1,500 m. The measured angular errors were 4.455°, 7.551°, and 5.154°, corresponding to relative angular errors of 1.24%, 2.10%, and 1.43%, respectively, with an average relative angular error of approximately 1.59%. These results indicate that the proposed eight-element pseudo-Doppler RDF prototype can provide practical bearing estimation under the tested VHF field conditions. However, further experiments involving more azimuth angles, repeated measurements, and direct comparison with a four-element configuration are required to confirm robustness and quantify the performance improvement of the proposed system.
Co-Authors Adi Setiawan Arif Basuki Bagas Nur Susanto Budi Utama, Budi Christina Manitik Cipto Driyo Denny Dermawan Denny Dermawan Dulhadi, Dulhadi Indra Budhi Frebrianto Ridayati Ridayati Setiawan, Paulus Sidik, Aden Ilyas Sugiarto Kadiman Sugiarto S Sumpena Wahyudin Wahyudin Wartono Wartono