(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In Fig a line is used to produce a short rectangular pulse of width 12ns and peak value 800V. With S-2 open. S-1 is closed to charge the line to V_{dc}; after charging, S-1 is opened. Then, at t = 0, S-2 is closed to discharge the line through R_{R}and form the pulse. Find the length of line and V_{dc}

[PLAIN]http://img51.imageshack.us/img51/4968/capturezc.jpg [Broken]

Answer :- 1.2 m , 1600 V.

2. Relevant equations

v = 1/[tex]\sqrt{\mu\xi}[/tex]

3. The attempt at a solution

Velocity in the Tx line would be 2 x 10^8 m/s by making use of the formula.

Also as R_{R}= R_{o}, equivalent ckt while discharging would be a voltage divider circuit , so Vout will be 1/2(Vdc) .So we need a Vdc of 1600 V.

But I am unable to work out how the pulse would be generated.

I mean how is the Tx line charged and discharged in general.After switch S2 is closed do we treat the lines as a voltage source and for how much time will the discharge take place?

Confused , help please.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Rectangular Pulse on a Transmission Line

**Physics Forums | Science Articles, Homework Help, Discussion**