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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 57 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 Nurul Ilmi; Mohamad Fathurahman
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 Hayyina Wienastuti; Astri Astari; Yenniwarti Rafsyam
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.
Sistem Monitoring Kebisingan Pada Pabrik Beton Berbasis Website Muhammad Daffi Rizqirobbi; Nabila Nasya Hasanah; Shita Fitria Nurjihan; Toto Supriyanto; Azkia Al Fataya Maulana; Yenniwarti Rafsyam
Spektral Vol. 7 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v7i1.8359

Abstract

Noise levels in industrial environments such as concrete factories often exceed the safe threshold of 85 dB, posing risks to workers’ health and safety. Conventional monitoring methods remain manual and periodic, making them ineffective in providing real-time alerts. This study proposes an automated noise monitoring system based on the Internet of Things (IoT) using an INMP441 sound sensor and ESP32 microcontroller, which transmits data to a server via the MQTT protocol. Noise level data is displayed in real-time through a web interface, and alerts are triggered when the noise exceeds the safe threshold, utilizing DFPlayer Mini, a speaker, and a MAX7219 dot matrix display. Testing was conducted in two factory areas with measurement distances ranging from 1 to 5 meters. The system successfully displayed real-time conditions, such as the message "SAFE AREA" and "NOISE: 78 dB". Network performance testing using Wireshark showed stable results with an average throughput of 745.6 Kbps, latency of 6.821 ms, and 0% packet loss. DDoS attack simulations with up to 500 threads demonstrated that the website remained functional with only 60% CPU usage. The system is proven to be effective for real-time industrial noise monitoring.
Analisis Kinerja Komunikasi Nirkabel dalam Sistem IIoT untuk Monitoring dan Controlling pada Ruangan Oven Batang Rokok di Pabrik Indokretek Malang Ainnur Rahayu Pratiwi; Elsa Lolita Anggraini
Spektral Vol. 7 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v7i1.8530

Abstract

Temperature and humidity stability in the cigarette rod oven room is essential for maintaining drying quality and production consistency. Manual monitoring may delay the detection of changes in oven conditions, creating the need for a wireless communication-based Internet of Things (IoT) system to support real-time monitoring and control. The proposed system is developed using DHT11 sensors, Raspberry Pi 3, relay modules, LCD, Mi-Fi as a cellular gateway, Firebase, and an Android application. The experiment was conducted in an oven room measuring 216.5 cm × 194 cm. Wireless communication performance was evaluated using three parameters: delay, packet loss, and throughput under working and non-working hours. Results show an average delay of 63.89 ms during working hours and 63.50 ms during non-working hours, both below the 100 ms threshold. Average throughput was 22,291.90 bps and 6,185.12 bps for working and non-working hours, respectively, indicating sufficient capacity for periodic sensor transmission. Average packet loss was 1.06% during working hours and 0.95% during non-working hours, indicating acceptable performance, although reliability decreases slightly during working hours. Overall, the tested wireless communication system is suitable for supporting basic monitoring and control in the cigarette rod oven room.
Perancangan dan Karakterisasi Antena Vivaldi untuk Aplikasi Anti-Drone Jammer pada Frekuensi 1,2 GHz, 2,4 GHz, dan 5,8 GHz Muhammad Umar Zain; Fitri Elvira Ananda; Nanang Kurniawan
Spektral Vol. 7 No. 1 (2026): April 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/spektral.v7i1.8546

Abstract

This study presents the design of three vivaldi antennas operating at 1.2 GHz, 2.4 GHz, and 5.8 GHz, which are implemented as part of an anti-drone jammer transmission system. Unmanned aerial vehicles (UAVs), commonly known as drones, have experienced rapid growth and are widely utilized in both military and civilian applications. This development has increased the demand for effective counter-drone technologies, one of which is an anti-drone jammer system designed to disrupt radio-frequency communication between drones and their controllers. The antenna design process includes planning, mathematical calculations, simulation, fabrication, and performance characterization. Measurement results show return loss values of −20.52 dB, −15.16 dB, and −34.16 dB at 1.2 GHz, 2.4 GHz, and 5.8 GHz, respectively, with corresponding VSWR values of 1.17, 1.38, and 1.04. The proposed antennas achieve gains of 5.28 dBi, 8.34 dBi, and 6.15 dBi at the respective operating frequencies. Radiation pattern measurements indicate directional characteristics in the vertical plane, making the antennas suitable for jamming applications. The results confirm that proper simulation and optimization processes play a crucial role in achieving antenna performance that satisfies design specifications and supports implementation in anti-drone jammer systems.

Page 6 of 6 | Total Record : 57

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