To: José N. Maldonado

From: Jon Hagen

Date: 11-9-99

Subject: feed room waveguide entrance

Figure 1 is a plan view of the feed room, showing the 430 MHz waveguide entering from the right-hand side. The waveguide runs parallel to the front of the room and then has a bend of 11.883 degrees. The position at which the waveguides comes through the right-hand wall can be moved 13" in either direction, if necessary. In this case, the 11.883-degree bend will change position in order to not change the coordinates of point "A".

Figures 2 is an elevation view, showing the 24" piece of flex guide that will be bolted in when it is necessary to transmit 430 Mhz from the Gregorian dome. The dome is hung only 2 inches below the ceiling to maximize the length of the flex guide. This small clearance will make it necessary to lower the waveguide or tilt it down to get access to the bolts on the tops of the flanges.

Attached is a copy of the calculation to determine the coordinates of the end of the waveguide (point "A").