u/Old_Poem2736

I am looking for the manual for a 690D-1 antenna loading coil, coupler seen in the attached picture. This thing is painted green so there is a high chance there is an army field manual , parts breakdown, or maintenance manual. I am guessing that while it is labeled 690D-1 the army in its infinite wisdom calls it an M25/arc B -6 or something equally as helpful any assistance would be greatly appreciated

https://preview.redd.it/82y1y229tc0h1.jpg?width=1200&format=pjpg&auto=webp&s=4a942920c76f78edebd5a5072226f3b4fd74bcd6

Thanks