The spice3f5 help panel on lossy transmission lines states: 3.3.3. Lossy Transmission Line Model (LTRA)
The uniform RLC/RC/LC/RG transmission line model (re- ferred to as the LTRA model henceforth) models a uniform constant-parameter distributed transmission line. The RC and LC cases may also be modeled using the URC and TRA models; however, the newer LTRA model is usually faster and more accurate than the others. The operation of the LTRA model is based on the convolution of the transmission line's impulse responses with its inputs (see [8]). The LTRA model takes a number of parameters, some of which must be given and some of which are optional. name parameter units/type default example R resistance/length Z/unit 0.0 0.2 L inductance/length henrys/unit 0.0 9.13e-9 G conductance/length mhos/unit 0.0 0.0 C capacitance/length farads/unit 0.0 3.65e-12 LEN length of line no default 1.0 tomdean _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user