Download [Magazine] QEX. 2004. Number 7 PDF

QEX is the ARRL "Forum for Communications Experimenters. released bimonthly, it good points technical articles, columns, and different goods of curiosity to radio amateurs and communications execs. The project of QEX is to:1. offer a medium for the alternate of rules and knowledge between novice Radio experimenters,2. rfile complicated technical paintings within the beginner Radio box, and3. help efforts to develop the kingdom of the beginner Radio art.Each factor grants as much as 4 instances the technical fabric present in every one QST. Our sixty four pages often accommodate seven to 10 articles, plus letters and different fascinating goods. we try to take care of a stability among theoretical and functional content material. Articles diversity from basic building tasks to development in radio thought. nearly every thing of the journal is dedicated to priceless suggestions for the technically savvy. you're invited to obtain examples of exceptional QEX articles lower than, and spot for your self.

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0 MHz and the results are shown in Fig 3. 8 The published values of all of the relevant line parameters for all the grades of line likely to be of interest to radio amateurs (and many more) are incorporated into this software which makes it a very useful source of information in addition to its main function of performing the transmission-line equation calculations. TLD includes values for RG-213 from two manufacturers: Belden’s 8267 and Wireman’s CQ110, which are not exactly the same. The Belden 8267 values were used in this evaluation.

0 metres RG213 mil. spec. accurately measured. Enter frequency Enter value of load resistance. Enter measured impedance. 9j ohms Enter value of load resistance. Enter measured impedance. 7j ohms Enter impedance measured with antenna connected. 0j Feeder complex impedance Matched feeder loss Feeder effective length Antenna resistance Antenna reactance True SWR at antenna True SWR at transmitter SWR at tx. ref. 30 dB Figure 3—User screen 2 with provision for eight columns of results identified by frequency.

Html. 9P. H. Smith, Electronic Applications of the Smith Chart, Second Edition, 1995, Noble Publishing Corporation, Atlanta, GA. ISBN 1884932-39-8. Jul/Aug 2004 41 Appendix 1. The Smith Chart as a Modified Argand Diagram As stated in the text, the Smith chart is a reflection-coefficient Argand diagram with modified coordinates. Instead of being scaled in the rectangular coordinates of the real and imaginary components of the complex reflection coefficient, it is scaled in the circular coordinates of resistance and reactance to which they are related by Eq 4.

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