Onno,

http://www.qsl.net/g4ftc/amplifiers/8171/home.htm

http://tinyurl.com/yq6a9

http://www.angelfire.com/darkside/rfbox/

http://www.somis.org/

and when you wish to plug it into the mobile:

http://www.extremecb.com/Engine_3.jpg

Enjoy
--
Philip de Cadenet G4ZOW
Transmitters 'R' Us
http://www.transmittersrus.com