Question

Question 3-100 Marks Time Domain Reflectometry A transmission line is created from spare equipment at hand but has mis-matched impedances. The equivalent circuit is shown in the diagram following. It has source of internal resistance, Zi, is driving a load, z, via a length, d, of lossless 75Ω coaxial cable, Zo. The source voltage is initially zero and the line is initially uncharged, with NEr 2.8 Z1 Vi 7o ZL 0 coaxial cable Table 3: Values for Calculations Last Student Digit 9 36 800 15 Property Units Zi Part (a) 20 Marks If the open circuit source voltage, Vi, jumps abruptly from zero to +31.2 volts att 0: Calculate the round-trip delay; i. Calculate the amplitude of the initial step which is launched onto the line; and then ii. Calculate the final values of both the sending end and receiving end voltages

Answer 1

Given that 31.2 V Vit Zo Giveりvr jurnps abhu pity forn zero to 34 . 2volt at t-o (İİ) Amplitude b lnbal step "shich is launched onto line As per th ent wave Analy sis, S unge voitage which is enteing into fhe cablo is -[스x75-131.2 75寸36 → |Vt.- 12162 Volt Also Ra fled dSuge vo tc 75-36) 31,2 今|VA - 10.962. Volt Kii → 31.2-10.962-20.24 volt Ans Nous Recieving end volt 75 800

Now We tno, spead Transiet wave avllig is Mansient wave tvavell 3 x 10 m/s 2.8 tne A24 urad to Moo kound Trup dolor maons tine Alp delay , completo e loo is time se d is Dis tanCe 15 m .40 nano second Round Tkip dela¥ー2X140ニ280 nano second