a H155 coaxial cable is not good choice for Tx use, especially for higher power. This cable, thanks to its structure, produces a lot of intermodulation ( tested in our contest station OM6A). You can get any good quality cables + connectors in Slovakia. See www.ges.cz, www.gme.sk www.tme.sk etc. Even you can order professional cable assembly for reasonable price here: https://konektor-kabel.cz/. Here, you can select good quality stranded or hard-line cables + high end connectors (Rosenberger, Andrew, Spinner). I do not recommend you to use no name shiny connectors. These connectors are working with acceptable impedance match (20 dB) maximum up to 70 cm. They have impedance match less than 13 dB on 13 cm.
Good luck with your satellite project.
See you on transponder,