Andy writes:

I have a need for a quarter-wavelength transmission line at 25 ohms
impedance.

My SPICE simulator tells me that I can connect two 50 ohm, quarter-
wavelength
transmission lines in parallel and get the exact same performance
as the needed
25 ohm line.

However, I have not seen anyone try this, nor seen it used in
equipment.

Does anyone here have any experience with doing this, or have any
learned
opinions as to why it might, or might not, be a good idea ??

Thanks for your informed advice..

Andy W4OAH