By C.R. Scott
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6. Unintended interference between a radar transmitter and a digital computer. 7. Interference between an automobile ignition system and the car radio. 8. Interference in a radio due to lightning. 9. Several other interference situations of your choosing. 2 Scan the topic index of the following publications to get an appreciation for the various topics of EMC: 1. IEEE Transactions on Electromagnetic Compatibility. 2. Proceedings of the IEEE International Symposia on Electromagnetic Compatibility.
Answers: (a) 102dB mV (101:58 dBmV), (b) À28dBmV(À27:96 dBmVÞ, (c) 154 dBmV (153:63 dBmV). 5 DECIBELS AND COMMON EMC UNITS 31 The ability of the dB (and the logarithm) to compress large numbers into smaller ones means that we can make some relatively crude approximations and still arrive at a reasonable estimate of the number in dB. Another example of the utility of expressing EMC units in dB is given in Fig. 7. 40) gives Pout dB ¼ GaindB þ Pin dB (1:45) The reference quantity for Pout and Pin used to convert them to dB can be any convenient base such as 1 mW.
1 gives the wavelengths of sinusoidal waves propagating in free space for various frequencies of that wave. 2) yields b i(z, t) ¼ I cos v t À z v (1:9) z ¼ I cos v t À v This result illustrates that the phase shift of a wave is equivalent to time delay, which is given by z=v seconds. 4) as the current propagates along the connection leads a distance of one wavelength, L ¼ l, it suffers a phase shift of f ¼ bl ¼ 2p radians or 3608. In other words, if the total length of the connection leads is one wavelength, the current entering the connection leads and the current exiting those leads are in phase but have changed phase 3608 in the process of transiting the element.