Tnx to all Ham that have helped me (especially LZ2US)....Much interesting all comments and link (G3SEk in first time)..Now i'll appraise the system that more i like .....The system it will work also on SSB so an adequate good stabilization (@380/400 volts) is request and at the same time is request a good protection.... Best '73 de IZ5GNS Daniele.-