I used the component editor to make the center tapped transformer, without problems; now I need to add spice settings. I have been looking for an example for making a subckt for spice simulation. The example subckt is a simple center tapped transformer using mutual inductance. The inductors values and mutual inductance values should be selected on the schematic.
I use LT spice for simulation.


For example:



.Subckt MyTransformer 1 2 3 4 Nct
.parm v=100uh vk=1.0
L1 1 2 {v}
L2 3 Nct {v}
L3 Nct 4 {v}
K L1 L2 L3 {vk}
.ends

When exported (File/export/spice netlist...) the transformer subcircuit does not appear in the spice netlist. Other values used in the schematic (not shown) are correctly exported. I have tried using pin numbers and pin names, neither work. I suspect I have missed a simple setting.

Using version 2.2.0.9 64 bit and 2.2.9.0 beta.
Running Win 7 64 bit ultimate

Suggestions greatly appreciated.

Rob