ELKHA : Jurnal Teknik Elektro
The ELKHA publishes high-quality scientific journals related to Electrical and Computer Engineering and is associated with FORTEI (Forum Pendidikan Tinggi Teknik Elektro Indonesia / Indonesian Electrical Engineering Higher Education Forum). The scope of this journal covers the theory development, design and applications on Automatic Control, Electronics, Power and Energy Systems, Telecommunication, Informatics, and Industrial Engineering.
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<![CDATA[Analisa Unjuk Kerja Grid Tied Inverter Terhadap Pengaruh Radiasi Matahari dan Suhu PV pada PLTS On-Grid ]]>
<![CDATA[Nahela, Safri]]>;
<![CDATA[Faridyan, Ivan Fauzi]]>;
<![CDATA[Rachman, Noviadi Arief]]>;
<![CDATA[Risdiyanto, Agus]]>;
<![CDATA[Susanto, Bambang]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.31452
<![CDATA[Abstract – Solar radiation and temperature in photovoltaic (PV) can affect the output voltage and current of PV so that it also relates to the performance of the Grid Tied Inverter (GTI) on the on-grid PV system. This paper discusses the performance of the GTI based on output power on solar radiation and PV temperature. The method used in this testing was measuring simultaneously against the current and voltage parameters on PV, the current and voltage of the GTI, and the radiation and temperature of PV. Measurement with a data logger was also carried out on the above parameters in the morning and evening to find out at least the PV output voltage and current when the GTI starts or stops sending the power. The measurement results obtained that the GTI output power is affected by solar radiation and PV temperature. On the same radiation when the PV temperature gets higher, the PV voltage will drop, but the PV current and GTI current will increase. In addition, if with the same radiation and temperature but the AC source voltage was greater, the output power of GTI would also increase. The power produced by the GTI was lower than PV power due to GTI losses. The efficiency of the GTI decreases not only because of the increase in temperature above 35 oC but also due to the decreasing grid voltage. GTI starts sending power when the PV current was more than 2 A at 06.23 AM. GTI stops operating when the PV current was less than 1.74 A at 05.53 PM.]]>
<![CDATA[Desain dan Implementasi Visual Object Tracking Menggunakan Pan and Tilt Vision System ]]>
<![CDATA[Yunardi, Riky Tri]]>;
<![CDATA[Mardhiyah, Ajeng W.]]>;
<![CDATA[Yahya, M. Hafi]]>;
<![CDATA[Arisgraha, Franky Chandra Satria]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.34351
<![CDATA[Object tracking is a technique for detecting and following the moving object. It can be used to helping security officers to monitor the room that has a large monitoring working area. The aim of research is to design the visual system of object tracking by using pan and tilt vision system. The orientation of camera can move in vertically and horizontally path. Visualization program for this project is consist of motion detection, edge detection and center of mass. The detected object position can be used for controlling the pan and tilt at mechanical system which is mounted on the camera to track the moving object. The results of research show the design of object tracking can detecting and following walking human with an ideal distance of 6 meters and directional angular shift is 5 degrees on the visual resolution of 360 × 240 pixels]]>
<![CDATA[Penggunaan Pin ADC (Analog to Digital Converter) pada Mikrokontroler ATmega8535 untuk Menghasilkan Catu Daya Digital ]]>
<![CDATA[Pauzan, Muh]]>;
<![CDATA[Yanti, Indri]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.35036
<![CDATA[Digital power supply with LM317 regulator have been built. The output voltage of LM317 regulator is digitalized by means of ADC pins in ATmega8535 microcontroller. 128 prescaler is used to make the microcontroller’s frequency in the region of ADC’s frequency, therefore ADPS0, ADPS1 and ADPS2 must be high (1). AVcc (5V) is used as voltage reference, it is means that REFS0, REFS1 is set to high (1) and low(0) respectively.   LCD 16x2 is used to display the voltage output of LM317. The research divided into three stages: theoretical study, simulation and implementation. Theoretical study consists of AC-DC conversion and digitalizing the output voltage of LM317. Aim of the study of AC-DC conversion is to know the specification of elements to build 30 V, 1 A power supply. Circuits and coding in ATmgea8535 for converting analog to digital is studied. Proteus software is used for designing the circuits and simulation while Atmel Studio for compiling the coding. The difference of voltage measurements is found between digital voltmeter and LCD in the implementation stage, the range is 0.2-3.19 V. After callibration, same voltage values both on voltmeter and LCD is displayed. It is concluded that minimum-maximum output voltage of power supply is 1.2-27.10 V.]]>
<![CDATA[RANCANG BANGUN SISTEM MONITORING PERTUMBUHAN BERAT DAN TINGGI ANAK BALITA BERBASIS DATA PADA POSYANDU ]]>
<![CDATA[Sardi, Juli]]>;
<![CDATA[Habibullah, Habibullah]]>;
<![CDATA[Risfendra, Risfendra]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.31141
<![CDATA[Abstract – Posyandu (Integrated Service Post) is one form of health services in Indonesia that is based on community resources, especially for the health of mothers and balita (children under five). One of the services at the Posyandu is monitoring the growth of balita by measuring their weight and height regularly. So far, the measuring instrument used conventional and the results are not stored properly. This study aims to apply the database that are integrated with measuring instruments that can be used to monitor the growth of balita. The proposed system includes making a measuring device (hardware) that is connected to a database application (software). Hardware includes loadcell circuits, ultrasonic sensors and Arduino as data processors. LabView is used for database applications and interfaces. The system has the function of data acquisition, monitoring, storing data into a database, displaying and printing data. The results show all aforementioned functions are successfully working to achieve the design requirements. This application can be used to monitor the growth of balita at the Posyandu. The measurement data is stored for database. Recapitulation of measurement result can be displayed in graphical and can be directly printed to be given to parents of balita when measuring their children.]]>
<![CDATA[Deteksi Osilasi Masalah Penalaan Pengendali secara Real-time dengan Metode Deteksi Puncak Spektrum ]]>
<![CDATA[Permana, Boby Aoliya]]>;
<![CDATA[Wardana, Awang Noor Indra]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.34940
<![CDATA[In process industry, most control loops suffer with disturbances indicated by existing oscillations. One of the major problems of the oscillation is controller tuning problem. Peak spectral detection method which is classic and simple way is proposed as technique for detecting oscillation. Nevertheless, the utilization and performance of peak spectral detection on process oscillation detection still cannot be found. This study develops the utilization and performance of peak spectral detection method. It implemented based on IEC 61499. To evaluate the method, test data are used to set the lag value in peak spectral detection method and industrial data for obtaining performance of peak spectral detection method. With fast Fourier transform length 512 points and lag value 180 points, the developed peak spectral detection method detected two oscillations of three different oscillating signals at 461 s and 441 s.]]>
<![CDATA[Rancang Bangun Sistem Monitoring Angkutan Umum Menggunakan Metode GPS Tracking Area Purwokerto ]]>
<![CDATA[Amanaf, Muntaqo Alfin]]>;
<![CDATA[Anggraeni, Siska]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.33291
<![CDATA[Increasing the number of public transportation not only can fulfill transportation needs, but also becomes a new problem for the public that does not give the information position of the presence of public transportation in the city of Purwokerto. In this paper we makes the design of public transportation monitoring tools using the GPS tracking method. GPS tracking is a monitoring / tracking system and location determinant using GPS satellites accurately in the form of coordinate points that can be observed in realtime through digital maps. In this system using the Arduino UNO microcontroller which contains the SIM808 module to receive GPS data and supports GPRS connectivity, so that the coordinate data can be sent and stored at Thingspeak as a server platform. Coordinates of the location stored on the Thingspeak server are displayed on a map in which there is a marker of the position of the vehicle and can be accessed through the android application on the user's side. The system design measurement resulted in an average system coordinate error in indoor conditions of 4,644 meters, while the average system coordinate error in outdoor conditions was 2,065 meters from the actual location coordinates. This system also produces a percentage value of the average packet loss, which is 3,33% and the average delay for every shipment to the server is 38,468 second.]]>
<![CDATA[Pemodelan Sistem Dengan Metoda Identifikasi Parameter Menggunakan Pendekatan Model ARX (Autoregressive Exogenous) ]]>
<![CDATA[Elbani, Ade]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.30970
<![CDATA[Abstract – Systems that exist in nature are a combination of linear and nonlinear elements, and there are still many other factors that affect the linearity of the system. System models are very difficult to obtain with mathematical calculations, and also many neglected elements, especially nonlinear elements. So that the resulting model becomes less effective to be applied directly in the field. In addition to these methods, there are other modeling methods, namely the identification method. This identification method is carried out on the basis of the input signal and output of the system to be modeled. All of that is considered to be an integrated system (black box). The model structure approach that will be used is ARX (Autoregressive Exogenous), which is a linear model structure, and parameter estimation algorithm uses the least square. Based on the analysis that has been done, the system is linear, there is no noise, has a time delay with off-line data pairs. From the modeling process carried out, order of the system and model parameters are obtained, so that a good system model is obtained. The model obtained, then can be used for other purposes, for example for the purposes of control, analysis needs, and for other simulation purposes.]]>
<![CDATA[UJI KETAHANAN IMAGE WATERMARKING DARI METODE CRT DENGAN DETEKSI TEPI CANNY UNTUK CITRA RABBANY ]]>
<![CDATA[Bustami, Sri Heri]]>;
<![CDATA[Susanto, Ajib]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.34793
<![CDATA[One technique to obtain validity in protecting a brand is with a watermark, one of the watermark algorithms to provide the validity of a brand is the Chinese Remainder Theorem (CRT) algorithm. In previous studies using the CRT method with canny edge detection has the ability that the watermark produced is almost similar to the original image and the results are quite good, the CRT method in canny edge detection can significantly improve the quality of the watermark image with an average of 0.99942. Whereas when given an image processing attack that is noise 'salt and pepper' and jpeg compression can maintain robustness with an average compression of 0.66187 and noise 0.940243. However, this method is not imperceptibility and robustness against Gaussian blur cropping, rotate 30 °, rotate 45 °, rotate 90 ° and rotate 180 ° where the average NC value away from 1. From the results of the research proposed the method tested has not been imperceptibility and robustness against Median Filter attacks, Contrast times 1.5, Contrast times 1.8, Scaling 359x359 pixels and Scaling 256x256 pixels where the average NC value is still away from 1. But in Median Filter and Scaling attacks 256x256 pixels indicate average results of extracted attacks can still be relatively identified with the naked eye even though the NC value generated does not approach 1.]]>
<![CDATA[Peningkatan Gain dengan Teknik Multilayer Parasitic pada Perancangan Antena Mikrostrip Persegi Panjang 2,4 GHz ]]>
<![CDATA[Utami, Eva Yovita Dwi]]>;
<![CDATA[Prabelia, Chorintan]]>;
<![CDATA[Setiaji, Fransiscus Dalu]]>;
<![CDATA[Wahyu, Yuyu]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.34352
<![CDATA[Microstrip patch antennas offer low profile and low cost fabrication advantages but limited gain and bandwidth. Some methods and techniques have been proposed and developed to improve gain of microstrip antenna, and one of them is multilayer parasitic technique. In this paper, the design and realization of rectangular patch microstrip antenna with multilayer parasitic for enhancing antenna gain that operates at frequency of 2.4 GHz is presented. The designed antenna consists of one rectangular patch as the main antenna on the first layer and the 2x2 configuration of rectangular patches on the second and third layers as the parasitic substrate. The simulation results show that the single element antenna has a gain of 3.224 dB and increases to 8.593 dB by using the parasitic multilayer antenna. The antenna design was then fabricated using an Epoxy FR4 substrate with a dielectric constant of 4.65 and a thickness of 1.6 mm. The fabricated multilayer parasitic microstrip antenna has dimension of 80 mm x 90 mm x 34.8 mm. The measurement results show that the VSWR value is 1,284 and the return loss is -18,091 dB at the center frequency of 2,442 GHz. The gain of the multilayer parasitic microstrip antenna measurement is 9.1 dB. The operation frequency range is 2.32 - 2.565 GHz at VSWR Â < 2, the bandwidth of 245 MHz is achieved and unidirectional radiation patterns are obtained.]]>
<![CDATA[Radio Direction Finder pada HF Band sebagai Elemen dari Passive Radar ]]>
<![CDATA[Rustamaji, Rustamaji]]>;
<![CDATA[Sawitri, Kania]]>;
<![CDATA[Fuady, Ghaniyman]]>
<![CDATA[ ELKHA : Jurnal Teknik Elektro Vol.11 No.2, October 2019 ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Tanjungpura ]]>
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DOI: 10.26418/elkha.v11i2.34733
<![CDATA[A Radio detection and ranging (radar) is used to detect and track objects in the air and on land, one type of the radar that is known is a passive radar. The radio direction finder (RDF) as an element of a passive radar is used to determine the direction angle, based on a radio waves that emitted by an object. The purpose of this study is to produce a RDF that works on HF bands as passive radar elements. In this study a RDF has been produced, which consists: a receive antenna in the form of a dipole λ/8 and a yagi 5 elements with horizontal polarization, a tuning circuit, an AM signal detector, an audio amplifier, and equipped with a level signal display in the form of a S meter and a loudspeaker. The test results for outside and inside the room at a certain time, the RDF can detect the angle of direction of horizontal plane of an object or AM transmitter from 0° to 360° in the frequency range between 4.02 to 10.76 MHz. The results of detecting the angle of direction of an object or a transmitting radio waves in the HF band, in the form of a signal level are then plotted on the polar diagram of the horizontal plane, and the sound can be heard through the loudspeaker. Furthermore, the results of this study can be used for the development of a RDF independently, and its implementation in the passive radar.]]>
