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Presents a quiz on shielding susceptible devices from undesired electromagnetic emissions.
Julia's rather bold comment, “A green house but a dumb one!” convinced David that the right time had come for implementing state-of-the-art intelligent-house technologies into his beloved mansion. His motto is “smart and reliable.” Leaving the intell
Provides the solution to the FPGA Quiz originally published in the February 2012 issue.
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Those of you who have already downloaded the MATLABbased ComplexGUI virtual tool, made available after the publication of its tutorial, please note that we have just prepared its Web-based version, which is ready for you at DOGUS MODSIM lab [see ibid
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In his EM Programmer's Notebook in the June 2009 issue of the Magazine, David B. Davidson presented a paper by Edward J. Rothwell  on the exponential approximations of some special functions, i.e., several ordinary and modified Bessel functions, w
Levent Sevgi is this month's Editor of "Testing Ourselves." He briefly introduces this month's contribution.
Various puzzles, humorous definitions, or mathematical recreations - usually having some relevance to electrical engineering - that should engage the interest of readers.
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Overviews current society and chapter news and events.
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The tutorial in this issue is reserved for classical radar cross section (RCS) measurements. The follow-up tutorial, on software-controlled novel RCS measurement approaches, will hopefully be ready for the April 2014 issue. Brian Fisher, one of the A
Testing Ourselves Levent Sevgi DoQuf University Electronics and Communication Eng. Dept. Zeamet Sokak, No 21, Acibadem - KadikOy Istanbul, Turkey Email: [email protected][email protected] http://www3.dogus.edu.trllsevgi
I'm sure you all remember David, the new antenna engineer who was very happy when he calibrated the antennas he found in his company's warehouse . Now, David is going to place a kind of antenna tracking system on the roof at home. Instead of buying it as a built-in system, he is willing to design the system by himself. The quiz of this issue is about designing a rooftop-antenna tracking system. It comes from Prof. Dr. Salman Kurtulan and his PhD student, Miss Yaprak Yal91n (Figure 1). Dr. Kurtulan has been with the Control Engineering Department of the ElectricalElectronics Faculty at Istanbul Technical University (lTD) since 1982. He received the BS, MS, and PhD degrees, all in Electrical Engineering, from lTV in 1982, 1985, and 1992, respectively. He has also developed and presented many innovative technical training programs related to industrial automation. His current research interests include discrete-event systems, industrial automation and control, digital design, electrical transportation, and electrical drives. Dr. Kurtulan has established an excellent lTD-SIEMENS Industrial Automation Lab, and has been its Director for nearly two decades. Miss Ya191n received the BSc and MSc degrees, all in Electrical Engineering, from lTV in 2002 and 2004, respectively. She is currently a research and teaching assistant at the same university, pursuing her PhD degree. Her research interests include industrial automation and control, model-based predictive control, and energy-based control for port-controlled Hamiltonian systems.
The Quiz for this Issue
Figure 1. Salman Kurtulan (I) and Yaprak Yal~ln.
The tracking system should be able to operate in two different modes. David wants to increase or decrease angles by pressing azimuth and elevation up and down keys (four keys) in the manual mode. Thus, he will be able to adjust the direction of the antenna by himself. In auto mode, the pointing operation will be done by the control system tracking automatically to the given azimuth and elevation angles of a fixed transmitter. The deviation effects of wind and other disturbances, such as birds, cats, etc., should also be considered. The maximum wind speed will be assumed to be 150 km/h. Could you please help David in his work and design such a system?
The antenna weighs around 15 kg, and the diameter of the dish is 45 cm. The main objective of the antenna tracking system is to achieve the pointing of the antenna to the given azimuth and elevation angles of any fixed transmitter. The servo system should thus have two degrees of freedom (azimuth and elevation). The nominal speed of the servo system should be 6 rpm. The friction coefficient of the gearbox is k = 0.2 .
1. L. Sevgi, S. c;aklr, and G. c;aklr, "Antenna Calibration for EMC Tests and Measurements," IEEE Antennas and Propagation Magazine, 50, 3, June 2008, pp. 215-224.
IEEE Antennas and Propagation Magazine, Vol. 51, No.1, February 2009