I'm in the process of scanning the Datron 4808 manuals and the first one which is for the 4808 Option 70 Wideband Source is now available from: <https://groups.io/g/Datron-Wavetek/files/Datron%204808/Datron%20Wavetek%204 808%20Option%2070%20Wideband%20Source%20Schematics%20&%20Parts%20List.pdf> Enjoy! Dave