Coding Theory The Essentials by D.G Hoffman

By D.G Hoffman

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33 Common-mode transfer impedance of PTFE-insulated, twisted shielded pair. 34 0 200 400 600 Frequency (MHz) 800 1000 Differential-mode transfer impedance of PTFE-insulated, twisted shielded pair. The #1 type provides some shielding, #2 much better shielding, and #3 the best shielding. Each conduit we tested was of ½ in. , although other diameters are available. The #3 is manufactured from a brass spiral wound flexible conduit covered in a tin-plated copper braid. The #2 is a brass spiral wound flexible conduit without braid shield and #1 is aluminum spiral Cable Shielding, Coupling from E and H Fields, and Cable Emissions 529 wound with braid.

The injection circuit is designed to have a characteristic impedance of 50 Ω, and the CUT is also designed to have a characteristic impedance of 50 Ω. The current is injected via a 4 mm wide braid located above and insulated from the conduit shield and returns to the signal generator via the conduit shield. This injection circuit also has a 50 Ω characteristic impedance. The voltage developed across this segment of the conduit is also measured between the center conductor of the CUT and its shield.

5 and 15 MHz, and these correspond to the frequencies where λ/2 and λ equal the line length of 20 m. Other resonances occur at l = kλ/2, where k is an integral multiple. 67 Magnetic field induction in a transmission line formed by a wire over a ground plane. 68 Termination current for a rectangular loop oriented normal to a perfect ground plane and illuminated by a plane wave. (From Degauque, P. , Remarks on the transmission line approach to determining the current induced on above-ground cables, IEEE Transactions on Electromagnetic Compatibility, 30(1), February 1988.

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