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Transmisi: Jurnal Ilmiah Teknik Elektro

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Published by Universitas Diponegoro

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Perhitungan Waktu Tunda pada Sistem Radar Sekunder dengan Menggunakan Metode TDOA (Time Different Of Arrival) Nainggolan, Paskah Handikardo Benjamin; Darjat, Darjat; Christoyono, Yuli
Transmisi Vol 13, No 1 (2011): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

The detection of the position and trajectory of the rocket is very necessary in order to launch a rocket capable of running as expected. If the position and trajectory of the rocket is not monitored properly, it could be bad. Therefore, the solution needed to be able to monitor the position and trajectory of the rocket with a specific technical studies. As an initial step in monitoring the position of the rocket is to know the time delay during the process send and receive signals between the sending station with a radio wave receiver. In this thesis, carried out a simulation application of TDOA-trilateration algorithm to compute the time delay on the secondary radar system. Techniques to get a distance that is by finding the difference between the send and receive signals between the transceiver station with a radio wave transponder. After setting on the transceiver and the transponder is set, by setting send data, protocol, and then it will be obtained automatically scanning the time delay is expected. This technique is called TDOA (Time Different Of arrival). This process will be simulated with MatlabaR2008a. Keyword : TDOA, time delay, rockets, radio, transceiver, transponder.

PERANCANGAN PERANGKAT KERAS ALAT UJI BIPOLAR JUNCTION TRANSISTOR BERBASIS MIKROKONTROLER Perkasa, Dedy Bagus; Andromeda, Trias; Riyadi, Munawar A
Transmisi Vol 21, No 1 Januari (2019): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Transistor bipolar merupakan piranti elektronika yang banyak digunakan dalam teknologi elektronika. Salah satu penggunaan transistor adalah sebagai amplifier audio. Pada rangkaian digital transistor digunakan sebagai saklar berkecepatan tinggi. Agar transistor bekerja dengan optimal, pemasangan transistor dalam rangkaian harus benar. Untuk itu, posisi kaki-kaki pin transistor dan nilai parameter yang ada pada transistor perlu diperhatikan. Alat bantu atau tester yang handal diperlukan untuk mengetahui letak pin pada transistor. Penelitian ini merancang suatu perangkat keras yang dapat digunakan untuk membaca jenis, letak kaki, nilai penguatan, dan tegangan maju transistor BJT (Bipolar Junction Transistor). Perangkat kerasÂ ini dirancang menggunakan mikrokontroller dan resistor untuk analisis titik kerja transistor. Pengujian dilakukan dengan menguji beberapa transistor BJT dengan tipe yang berbeda-beda. Hasil pengujian menunjukkan bahwa perangkat telah dapat bekerja dengan baik.

Perancangan Sistem Pemantau Ruangan pada Perangkat Bergerak Kusuma, Darmawan Surya; Sudjadi, Sudjadi; Isnanto, R. Rizal
Transmisi Vol 14, No 1 (2012): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

The monitoring system continued to evolve along with technological advances. This system aims to find information about the status of a particular object, as an evaluation material of the object. The development also occurs in mobile technology. Nowadays, mobile devices can be customized according to user needs. By looking at both development of technologies, there should be a development of monitoring system using mobile devices so the users can get the ease of doing monitoring process for a specific object whenever and wherever by using the application in theirs mobile device. This project is divided into four step. The first step is conduct an analysis of the methods thatâ€™s to be used in this research. The second step is designing an UML (Unified Modeling Language) to realize this system. The third step is creating and compiling the application program. Application programs is created using Java2 Micro Edition programming language (J2ME) on the Blackberry development environment. The final step is perform a tests on this application. Based on the results of tests performed, can be concluded that with these mobile applications, the users can perform a monitoring activities such as set the monitoring camera to take a pictures and access the server to request a monitoring pictures. As a monitoring system, this application provides direct monitoring (live) and the monitoring of time on request (on demand) and also provides the configuration screen for setting the monitoring time, interval cameras capture speed, interval slideshow, connection mode, the server's IP, and server port. The tests performed on Blackberry device. Keywords : Monitoring system, mobile device, UML (Unified Modeling Language), Java2 Micro Edition programming language (J2ME), Blackberry development environment, Blackberry device.

DESAIN KONTROLER GENETIC-FUZZY PADA MODEL AUTOMATIC-ANTILOCK BRAKING SYSTEM Surya, Andreas; Triwiyatno, Aris; Setiyono, Budi
Transmisi Vol 17, No 3 Juli (2015): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Abstrak Â Automatic Antilock Braking System menawarkan sebuah solusi pilihan dibidang system keamanan pengereman kendaraan, khususnya mobil, untuk melakukan pengereman secara otomatis. Automatic antilock braking system mengukur slip roda sebagai variabel dikontrol dan torsi rem sebagai variable dimanipulasi. Dalam penelitian ini, didesain kontroler Genetic-Fuzzy untuk menjaga slip sesuai ratio slip referensi. Algoritma genetika diaplikasikan untuk mengoptimasi parameter himpunan keanggotaan fuzzy. Pengujian kondisi aspal kering, kontroler Genetic-Fuzzy berhasil mencapai Â pemberhentian sempurna pada jarak 15,52 m dan IAE sebesar 0,095, sedangkan kontroler Fuzzy mencapai pemberhentian Â pada jarak 15,45 m dan IAE sebesar 0,099. Pengujian kondisi aspal basah, kontroler Genetic-Fuzzy berhasil mencapai Â pemberhentian pada jarak 17,46 m dan IAE sebesar 0,0806, sedangkan kontroler Fuzzy mencapai pemberhentian pada jarak 17,39 m dan IAE sebesar 0,0802. Abstract Â The Automatic Antilock Braking System offers an optional solution in vehicle safety braking system, particularly cars to brake automatically. Automatic antilock braking system works to measure wheel slip as controlled variable and applies braking torque as manipulated variable. In this final assignment, Genetic-Fuzzy controller has been designed to maintain measured wheel slip fit to the reference slip. Genetic algoritm was applied to optimize a membership function parameter of fuzzy. In dry asphalt simulation, Genetic-FuzzyÂ controller has succeed to achieve perfect stoppage distance by 15,52 m and IAE value of 0,095, whereas the fuzzy controller achieved stoppage distance by 15,45 m and IAE value of 0,099. In wet asphalt simulation, Genetic-FuzzyÂ controller achieved stoppage distance by 17,46 m and IAE value of 0,0806, whereas the fuzzy achieved stoppage distance by 17,39m and IAE value of 0,0802. Â Keywords: Genetic Fuzzy, Genetic Algoritm, Fuzzy, Automatic Antilock Braking System

KONSEP PEMROGRAMAN JARINGAN DENGAN MEMANFAATKAN MIDDLEWARE ORB (OBJECT REQUEST BROKER) Somantri, Maman
Transmisi Vol 7, No 2 (2005): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Dalam pemrograman client server tingkat lanjut, adalah memungkinkan untuk membangun sebuah aplikasi dengan dasar platform pemrograman yangÂ berbeda-beda. Dalam pemrograman jaringan biasa /Â konvesional, maka tidak akan mampu untuk mengkoneksikan dua atau lebih platform yangÂ berbeda. Misalnya ada dua buah server aplikasiÂ yang dibangun oleh masing-masing Java dan C++,Â sedangkan client-nya dibangun oleh aplikasi delphi.Â Untuk membangun aplikasi itu maka dibutuhkan sebuah lapisan yang bisa menghubungkan platformÂ pemrograman Â yang berbeda, lapisan yang dimaksudkan adalah diistilahkan sebagaiâ€˜middlewareâ€™. Middleware pada tataran implementasi merupakan sebuah paket program instan yang dipakai pada suatu platform permograman tertentu, sedangkan pada tataran konsep, middleware merupakan sebuah lapisan untukÂ lalu lintas penghubung komunikasi antar objek dariÂ sistem yang berbeda. Ada beberapa jenis middleware, seperti ORB (Object Request Broker),Â RMI (Remote Method Invocation), dan MOM (Message Oriented Middleware). Dalam tulisan iniÂ akan dibahas tentang tinjauan konseptual untuk membangun sebuah aplikasi dengan memanfaatkanÂ pemrograman jaringan dengan middleware. Middleware yang akan digunakan adalah ORB(Object Request Broker).Kata kunci: Middleware, ORB, CORBA

Analisis Perpindahan Kanal Komunikasi dalam Satu BSC pada Sistem GSM Berdasarkan Data Drive Test Menggunakan TEMS Investigation 4.1.1 Luluk Arifatul Chalida; Imam Santoso; Yuli Christyono
Transmisi: Jurnal Ilmiah Teknik Elektro Vol 11, No 4 (2009): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Mobile communications system created to meet the communication needs that can be done anywhere either when user is motionless or moving. To maintain the quality of services in a wide service area, coverage area is divided into smallest geographic units called cells. If the user moves from one area of the cell to another, then it needs an algorithm that guarantees the continuity of communications services. These algorithm is called a handover to a dedicated mode and the cell reselection for idle mode. In observing handoff algorithm, the operator did a drive test using computer and handset, which each had been equipped with special software, and GPS. This research analyze the problems related to the handoff algorithm, both when in idle mode or dedicated mode, including the causes, processes and things that influence it. Data acquisition is carried out through a drive test using software TEMS Investigaions GSM 4.1.1 with routes in the downtown area of Semarang. Drive test held on every Thursday and Sunday for three consecutive weeks starting on August 23, 2009 and each of day divided into three time allocation, ie morning, noon and night. The observed event include: cell reselection, handover, handover (intracell), handover failure and intracell handover failure. In addition Information Element that effected on the event are also observed, path loss criteria and cell reselection criteria for cell reselection, and received power, bit error rate and timing advance for the four other events. From the analysis is known that the assignment channel is triggered by the Information Element value that reaches a certain threshold value. For cell reselection, the both Information Element having equal influence. Information Element of the most influential for the handover and the handover failure is received power, whereas for two other events the most influential is the received bit error. After the detected value of the Information Element reaches a certain threshold, MSC will instruct the candidate cell to monitor and serving mobile station. Different process going on for handover (intracell), which after the information element value is known at a certain threshold, MS will move to another traffic channel in the same cell. If handover (intracell) was requested but could not be performed then handover based quality is tried the next time (if criterion is still given). When this handover also fails then BS toggles back and tries again a handover (intracell). In this drive test result there are 15 handover failures that may because no available traffic channel in candidate cell. There is only once handover intracell failure happened which may be caused by full traffic in candidate channel, but no cell reselection failure is found because this event doesn’t need traffic channel but only signaling channel. Keywords: handover, cell reselection, intracell, IE, TEMS

KONVERTER ARUS SEARAH KE ARUS SEARAH TIPE PENAIK TEGANGAN DENGAN DAN TANPA MOSFET SINKRONISASI Romadhon, Mohamad Isnaeni; Andromeda, Trias; Facta, Mochammad
Transmisi Vol 18, No 3 Juli (2016): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Efisiensi merupakan salah satu ciri khas pada sistem elekronika modern. Konverter arus searah ke arus searah (konverter DC) sebagai sumber daya sistem elektronika dapat ditingkatkan efisiensinya dengan cara mengganti dioda pada konverter DC dengan MOSFET. MOSFET dapat mengurangi rugi konduksi pada konverter DC sinkron karena rugi daya konduksi MOSFET yang lebih rendah dari rugi daya konduksi diode. Pada penelitian ini menggunakan Â konverter DC tipe penaik tegangan dan rangkaian pembangkit pulsa PWM (pemicuan)Â menggunakan ICÂ TL 494. Perancangan alat pada penelitian ini akan mengaplikasikan metode MOSFET sinkronisasi dengan mengganti diode pada rangkaian konverter DC tipe penaik tegangan biasa dengan MOSFET yang memiliki Rds(on) rendah. Kemudian akan dibandingkan efisiensi antara konverter DC tipe penaik tegangan dengan MOSFET sinkronisasi dan konverter DC tipe penaik tegangan tanpa MOSFET sinkronisasi. Pada konverter DC tipe penaik tegangan dengan MOSFET sinkronisasi semakin tinggi duty cycle maka akan semakin tinggi nilai efisiensinya. Pada konverter DC tipe penaik tegangan tanpa MOSFET sinkronisasi nilai efisiensi cenderung stabil pada duty cycle berapapun. Pada konverter DC dengan MOSFET sinkronisasi efisiensi akan terus meningkat dan saat duty cycle diatas 40% melebihi nilai efisiensi konverter DC tanpa MOSFET sinkronisasi.

Rancang Bangun Robot Pengikut Garis Dan Pendeteksi Halangan Menggunakan Mikrokontroler AT89S51 Sumardi, Sumardi; Setiawan, Iwan; Donnel, Hendri
Transmisi Vol 10, No 3 (2008): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Recently, the electronic field develop rapidly especially in creating robotic. ManyÂ competitions have conducted to compare technology, from hobbies until robotic industries areÂ never bored to talk. Industrially, automotive robotic needed in order to make the work moreÂ efficient, then it save cost of a production. Automotive robotic used also in entering dangerousÂ area, that there is unable to handle by human for safety reason.In this paper, there are two automotive robotic that created, which able to follow line and stopÂ when it detects any obstruction at front side. This robotic designed by MicrocontrollerÂ AT89551, ultrasonic sensor as obstruction detector and Â it also have four infrared andÂ photodiode sensors as line detector which through by feet. Automotive robotic will runÂ following designed line, if there is any obstruction then it will stop as long as thoseÂ obstructions are there and it run again if the ultrasonic sensor do not detect obstructionÂ anymore. By regulating PWM signal (Pulse Width Modulation) from microcontroller, then theÂ automotive robotic can walk straightly, turn and will stop if there are any obstruction detected.From the experiment and test Â which performed, robot is able to pass the turn with 60 cm ofÂ diameter, while Â for movement fork Â it is only perform straightly and stopped, exactly if robotÂ finding the obstruction it can stoped in the distance 40 cm. It shows that there is lack of sensor,Â which used in designing, then for particular fork, robotic is only able to stop and walkÂ straightly.Keywords: Microcontroller AT89S51, Lines Follower, Obstruction Detector

ALGORITMA GENETIKA SEBAGAI SOLUSI OPTIMAL POWER FLOW PADA SISTEM KELISTRIKAN 500 KV JAWA BALI Yassir, Yassir; Sarjiya, Sarjiya; Haryono, T.
Transmisi Vol 15, No 3 (2013): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Abstrak Â Optimal power flow dengan batasan transmisi adalah salah satu solusi optimisasi biaya produksi energi listrik dengan tetap menjaga keandalan sistem. Pada penelitian ini diaplikasikan metode Algoritma Genetika (AG) dengan daya aktif pembangkit, tegangan bus pembangkit, tap transformator dan injeksi kapasitor digunakan sebagai variabel control. Efektifitas metode diuji pada kasus sistem IEEE 30 bus, dan dibandingkan dengan metode evolutionary programming (EP), differential evolution (DE) dan particle swarm optimization (PSO). Hasil simulasi menunjukkan metode yang diusulkan lebih baik dari metode pembanding. Simulasi pada sistem tenaga Jawa-Bali 500 kV dengan metode yang diusulkan dapat mengurangi biaya pembangkitan sebesar 13,4% dibanding dengan data operasi PT. PLN (Persero). Â Kata kunci : Optimal Power Flow, Â batasan transmisi, Algoritma Genetika. Abstract Â Transmission constrained Optimal Power Flow is one of several methods to minimize fuel costs while maintaining system reliability constraints. In this study, Genetic Algorithm was applied to solve the problem of OPF. Active power generator, generator bus voltages, transformer tap and injection capacitor used as control variables. Effectiveness of the method was tested on IEEE 30 bus system case and it is compared with the evolutionary programming (EP), differential evolution (DE) and particle swarm optimization (PSO) method. Simulation results using the proposed method give better result than the mentioned methods. Simulation on the Java-Bali 500 kV power system based on proposed method can reduce the cost 13,4% compared with the existing operation of PT. PLN (Persero). Â Keywords : Â Optimal Power Flow, Genetic Algorithm, transmission constraint.

ANALISIS PENGARUH SINAR ULTRAVIOLET DAN KOMPOSISI FLY ASH TERHADAP UNJUK KERJA PERMUKAAN BAHAN ISOLASI RESIN EPOKSI SILICONE RUBBER DENGAN VARIASI INJEKSI TEGANGAN TINGGI Anggraeni, Diah Monica; Syakur, Abdul; Hermawan, Hermawan
Transmisi Vol 19, No 4 Oktober (2017): TRANSMISI
Publisher : Departemen Teknik Elektro, Universitas Diponegoro

Isolator polimer telah dikembangkan untuk menggantikan isolator keramik dan gelas. Salah satu bahan polimer adalah resin epoksi, dimana kelebihannya ringan, bersifat hidrofobik normal, dan proses pembuatannya cepat. Radiasi sinar ultraviolet dapat mempercepat penuaan dan degradasi pada permukaan yang memudahkan mengalirnya arus listrik permukaan. Penelitian ini membahas pengaruh dari paparan sinar ultraviolet dan penambahan fly ash sebagai bahan pengisi terhadap sudut kontak, waktu tracking, serta nilai arus bocor lucutan pertama. Penelitian ini dilakukan pada skala laboratorium menggunakan bahan polimer resin epoksi (DGEBA dan MPDA) yang dicampur bahan silicone rubber dan fly ash dengan variasi komposisi 20% (RTV22), 30% (RTV23) dan 40% (RTV24). Sampel dialiri kontaminan dengan resistivitas 3,95 Â± 0,05 â„¦m dan diberi pengaruh sinar ultraviolet selama 0, 24, 48, 72 dan 96 jam. Pengukuran arus bocor menggunakan metode Inclined-Plane Tracking (standar IEC 587 : 1984) dengan variasi tegangan 3 kV dan 3,5 kV. Hasil penelitian menunjukkan bahwa komposisi bahan pengisi resin epoksi dan penyinaran sinar ultraviolet sangat mempengaruhi besarnya sudut kontak, besarnya nilai arus bocor lucutan pertama, dan lamanya waktu tracking. Setelah diukur diperoleh data sebelum dan sesudah diberi pengaruh sinar ultraviolet sampel RTV23 lebih baik jika dibandingkan dengan sampel RTV22 dan sampel RTV24.

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