For FM tuner alignment purposes I want to build an outboard 10.7MHz marker generator to use in association with a piece of gear (ST1000A) that doesn't have one built in. They used to be available in little battery powered boxes with BNC in and out. Can someone direct me to a schematic? also construction information, e.g. any RF precautions I may need to take. Planning a metal hobby box.
Editing this to make it crystal clear that I am not seeking a product or product recommendation. Frankly it baffles me how anybody thought otherwise, unless they just didn't read it.