To: Kurt Kabelac	Fax: 6 pages, including this page

From: Jon Hagen

Date: 2-17-00

Subject: Collector Drawings

Kurt: Here are the first 5 pages of collector drawings. I'm working on the rest. The perspective drawing shows the mechanical concept and the various sub- assemblies. The list of stock I sent yesterday references the various assemblies, e.g. scoop, bulkhead, backshort, etc. Comments welcome.

Two of the drawings are for tuning elements not shown (yet) in the perspective drawing. The first is a hollow post that spans the 5.25 inside height of the collector chassis. It will be bolted in. The second is a low pill box that will be welded to the floor of the chassis, midway between the front wheel wells.

The other two drawings are for the stack, which is a length of half-height waveguide and a 3/4" flange which encirles the waveguide. I'm supposing Dave will weld the four walls together to make the waveguide and then attach the flange. I've shown a flush weld at the face of the flange for electrical continuity and also a fillet weld on the back of the flange for strength. The back weld is aided by cutting a rectangular groove in the back of the flange to form a welding tab. The weld at the front can be done with the waveguide protruding a sixteenth or an eigth of an inch as a welding tab. After welding, the entire front of the flange is skim cut flat (At Clark?). This is my take on how to do the stack - you and Dave and Lynn will likely find a better way.

I haven't shown the wheels but the idea is that steel backing plates will bolt to the inside faces of the wheel wells. Each plate will support horizontal axles for a top and a bottom wheel, and a vertical axle for a side roller.

file: coll01a.wp6