Kathrein, Amplifier, models:

20510026	Manual
VOS 11	Specification Sheet
VOS 137/RA	Installation Instructions Manual
VOS 22/RA	Quick Start Manual
VWS 04	Specification Sheet
VWS 2500	Manual Instructions Manual
VWS 2551	Manual Instructions Manual
VWS 2900	Manual
VWS 2991	Manual