Representing coax cable in Multisim

[TerriOSU]

I am trying to simulate a 50 ft coax cable connected to a signal generator on the left-hand side and a 50 ohm load on the right-hand side.  How would I build this using Multisim? 

[Mahmoud_W]

Hi,

The best option for you is to model the coax line as a 50ohm lossless transmission line and just calculate the delay it will introduce in second. You can use the following formula:

delay time = length of the cable/ TEM velocity (3*10^8m/s)

If you want to include losses you have to calculate the RLCG parameters of the coax cable and include them in the component Lossy Transmission Line.

You can learn more about this here.

I attached a design file that includes these components, always make sure that your load is the same as the transmission line characteristic impedance (matched) to avoid reflection.

Hope this helps,

Mahmoud W

National Instruments

[TerriOSU]

Thank you so much for replying -- however I cannot open your attached design document because I have the student version, not the current version 11.  Would you please convert the attachment so it can be opened with the student version and resend?  I really appreciate all the help you have given me, you are the only one to give me an answer to my question.

[Mahmoud_W]

Hi again,

Here is a screenshot of the project I sent you.

Let me know if you have any other questions,

Mahmoud W

National Instruments