Trying to model a transmission line. Selected the TLine component from the Analog Primitives > Passive Components library. No matter what I put into the "VALUE" field, none of my inputs seem to take; get applied to the model.
Here's what I see after I apply values and reopen the part editor:
As you can see, every property, including Z0 that I tried to set, is "undefined".
When I try to run AC analysis on a simple circuit I get the following error:
"Warning: Extra text '=75R' found.
Part: T1"
At this point, I'd just like to know if Micro-Cap is broken, or I'm missing something. Thanks to anyone who can help.
Here's what I see after I apply values and reopen the part editor:
As you can see, every property, including Z0 that I tried to set, is "undefined".
When I try to run AC analysis on a simple circuit I get the following error:
"Warning: Extra text '=75R' found.
Part: T1"
At this point, I'd just like to know if Micro-Cap is broken, or I'm missing something. Thanks to anyone who can help.
Last edited:
Hi rsbonini
I'm not a Micro-Cap user but one peculiarity is your circuit. More typically the source would have the 75 ohm resistor to define its source impedance followed by 75 transmission line and finally a 75 ohm termination. The transmission line is then perfectly matched and there will no reflected power. Your circuit presents 0 ohm source impedance and 150 ohm load.
Hope this helps.
I'm not a Micro-Cap user but one peculiarity is your circuit. More typically the source would have the 75 ohm resistor to define its source impedance followed by 75 transmission line and finally a 75 ohm termination. The transmission line is then perfectly matched and there will no reflected power. Your circuit presents 0 ohm source impedance and 150 ohm load.
Hope this helps.
What transmission line model are you using? (I haven't used microcap since MC6, very rusty, but I do have MC12 and will eventually get around to playing with it.)
BSST, you're right about the circuit, I just threw it together to show the error. I've edited the original post to correct it.
kevinkr, the transmission line model is the native "TLine" symbol in MC12. According to the documentation, MC12 selects either an ideal or lossy model according to the entered properties. I've tried the example properties just to get it going, but to no avail.
kevinkr, the transmission line model is the native "TLine" symbol in MC12. According to the documentation, MC12 selects either an ideal or lossy model according to the entered properties. I've tried the example properties just to get it going, but to no avail.
