I did not find a manual or schematic on the ARC-2. But I did find a source of military radio and radar manuals that is new to me: http://radionerds.com/index.php/Main_Page Also, I found a product data sheet on the ARC-2: http://rockwellcollinsmuseum.org/products/product_sheets/ARC-2%20&%20ARC-2A%20Product%20sheet.pdf Wayne