#171 Transcalc/Coupled Microstrip errs on synthesis

[a8421]

Transcalc/Coupled Microstrip is doing strange thing: I am entering two impedance values - even and odd. It supposed to calculate parameters of the traces accordingly. It does in general and remarkably accurately. But when I enter combination of impedances Zoe (Even Impedance) 51.78 Ohm and Zoo (odd impedance) less then 48 Ohm it and all physical parameters and electrical parameters all become 'nan's.
This is not physical - the calculation should continue working, I know because I insert example I did on another software.

[Guilherme]

Confirmed. If you change Z0e to anything lower than 58 and press synthesize it gets filled with nan's.

But if you set Z0o = 48 (press synthesize); then set Z0e = 51.78 (press synthesize) it seems to work...

[Claudio Girardi]

...just verified that this problem is present also in the original code I wrote more than 10 years ago, quite a long-standing bug :)
I have already a partial fix implemented, will update the code on Github soon..

[Guilherme]

Releated: https://github.com/Qucs/qucs/pull/85

[Guilherme]

Fixed in https://github.com/Qucs/qucs/pull/85