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INDONESIA
SPEKTRAL : Journal of Communications, Antennas and Propagation
Published by Politeknik Negeri Jakarta
ISSN : -     EISSN : 27745562     DOI : https://doi.org/10.32722/spektral.v1i1
Core Subject : Science, Engineering,
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
Komunikasi dan Teknologi Jaringan : Sistem Komunikasi Nirkabel dan Bergerak, Pengolahan Sinyal Digital dan Multimedia, Pengolahan Sinyal Biomedik, Teori Informasi , Modulasi, Pengkodean Sumber dan Kanal, Algoritma dan Protokol Komunikasi, Komunikasi Radio dan Satelit, Penerapan IoT, Jaringan Telekomunikasi, Komunikasi Optik, Jaringan Sensor Nirkabel, Artificial Intelligence, Machine Learning, Computer Vision, Mobile and Cloud Computing, Pervasive Computing, Big Data, Keamanan Jaringan, Cognitive Radio, Embedded System. Antena dan Propagasi: Desain dan Analisa Antena, Microstrip Antena, Penerapan Teori Medan Elektromagnetik, Radar and Remote Sensing, Gelombang mikro dan gelombang millimeter, Pemodelan Kanal dan Propagasi.
Arjuna Subject : Teknik (semua kategori) - Teknik Listrik dan Elektro
Articles 54 Documents
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PROTOTIPE MOTORIZED POINTING ANTENNA VERY SMALL APERTURE TERMINAL (VSAT) GEOSTASIONER MENGGUNAKAN ARDUINO MEGA 2560 SEBAGAI MAIN CONTROL UNIT Setiawan, Antonius Darma; Hasanah, Uswatun; Jaenul, Ariep; Mulyono, Sidik
Spektral Vol. 4 No. 2 (2023): Oktober 2023
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v4i2.6648

Abstract

Very Small Aperture Terminal (VSAT) merupakan salah satu jenis teknologi telekomunikasi yang menggunakan satelit sebagai media transmisi nya. VSAT berperan sebagai transceiver gelombang radio dengan menggunakan antenna berbentuk parabola. VSAT dapat membangun jaringan komunikasi secara global dan tersentralisasi dalam waktu cepat hanya dengan memiliki kelistrikan yang stabil dan ruang terbuka yang terbatas. Sebagai upaya pengembangan VSAT, salah satu inovasi yang dibuat adalah menjadikan proses pointing VSAT menjadi motorized dengan mengintegrasikan mikrokontroller untuk kontrol. Dengan menggunakan metode research and development, penulis melakukan riset pada penelitian terdahulu dan mengembangkan gap yang ada dengan penyesuaian terhadap kebutuhan di lapangan. Salah satu tujuan prototipe ini dibuat adalah dengan tujuan dapat diimplementasikan secara universal pada seluruh perangkat VSAT GEO dengan hanya memerlukan penyesuaian mekanikal, bukan pada program yang dibuat. Pada penelitian ini, Arduino Mega 2560 berperan sebagai main control unit yang diintegrasikan dengan beberapa sensor pendukung utama yaitu GPS NEO6MV2, compass HMC5883L, dan accelerometer MPU6050. Hasil dari penelitian ini adalah sensor GPS dapat melakukan deteksi lokasi dengan akurat serta HMC5883L dan MPU6050 dapat digunakan sebagai deteksi azimuth dan elevasi. Kesimpulannya prototipe ini sudah sesuai dengan hakikat proses pointing VSAT dan dapat diuji langsung pada perangkat VSAT GEO dengan penyesuaian mekanikal.
Implementasi Sistem GPS Tracker Berbasis IoT untuk Monitoring dan Tracking Tools Fiber Optik di PT XYZ Ilmi, Nurul; Fathurahman, Mohamad
Spektral Vol. 6 No. 2 (2025): Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v6i2.7745

Abstract

The development of modern communication technology demands fast and high-capacity data transmission, making fiber optics the primary choice in telecommunications infrastructure. The implementation of fiber optic technology requires special supporting devices such as splicers, Optical Time Domain Reflectometers (OTDRs), and Optical Power Meters (OPMs), which have high investment values ​​but are vulnerable to loss. PT XYZ, which is engaged in telecommunications infrastructure maintenance, experiences obstacles related to real-time location monitoring and limited visibility in managing high-value equipment assets. This study designs an Internet of Things (IoT)-based GPS tracker system for monitoring and tracking fiber optic equipment using the integration of the ESP32 architecture, SIM7600G-H module for 4G LTE connectivity, active GPS, and the Firebase Realtime Database. The monitoring website was developed with a role-based access control system that regulates three levels of access: Admin, Reviewer, and Field Team. The results of GPS accuracy testing at 11 locations in Jakarta showed an average deviation of 2.02 m with 90.9% of locations achieving the good to very good accuracy category (≤5 meters). The website's performance efficiency evaluation based on the ISO 25010 standard achieved a score of 90.20%, in the "Very Good" category, with a range of 88%-92%. The system is capable of providing real-time monitoring with update intervals of 30 seconds to 1 minute, minimizing the risk of asset loss and optimizing the efficiency of field fiber optic equipment management.
Implementasi Dan Pengujian Sistem Otomatisasi Pengomposan Pupuk Kompos Berbasis Internet Of Things Mohammad Aprizal; Agus Wagyana
Spektral Vol. 6 No. 2 (2025): Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v6i2.7877

Abstract

The conventional composting process often experiences instability in environmental parameters such as temperature, humidity, and pH, resulting in longer decomposition time and inconsistent compost quality. This study aims to design and develop an Internet of Things (IoT)-based automatic composter system capable of monitoring and controlling critical parameters during the composting process in real time. The system utilizes temperature, humidity, and pH sensors integrated with a microcontroller to automatically activate the heating element and fan according to the required conditions. The process data are transmitted to a website, enabling users to perform remote monitoring. Experimental results show that the system operates stably with sensor accuracy within acceptable tolerance limits, with an error of 3.00% for temperature, 7.88% for pH, and a consistent linear relationship in soil moisture measurements. With the maintained stability of these parameters, the composting process proceeds more quickly and produces more mature and uniform compost. This system offers a practical solution for organic waste management at the household scale.
Rancang Bangun Antena Mikrostrip Flower Patch with Circular Ring Frekuensi 2.4 GHz untuk Aplikasi Monitoring Ketinggian Air Toren Otomatis Wienastuti, Hayyina; Astari, Astri; Rafsyam, Yenniwarti
Spektral Vol. 6 No. 2 (2025): Oktober 2025
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v6i2.7947

Abstract

Microstrip Res are a popular type of antenna widely used in wireless communication systems due to their compact size, light weight, and ease of fabrication. This study focuses on the design and characterization of a flower patch microstrip antenna with combination circular ring element, operating at a frequency of 2.4 GHz for WiFi application. The design process was performed using full-wave electromagnetic simulation software to obtain optimum parameters, including return loss, Voltage Standing Wave Ratio (VSWR), and radiation pattern. Simulation results show the antenna achieved a return loss of 39.22 dB and a VSWR of 1.022, indicating good impedance matching to the 50 Ω system. The antenna was subsequently fabricated and tested using a Vector Network Analyzer (VNA) to verify the simulation results. The measurement results revealed an impedance value of 57.64 Ω, with a difference of approximately 7.6 Ω from the ideal value. This discrepancy is attributed to factors such as physical realization tolerance, dimensional variations, and fluctuations in the substrate's dielectric constant. Overall, the designed antenna exhibits good performance and shows potential for use as a WiFi antenna.

Page 6 of 6 | Total Record : 54

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