Front End Issues Paul Lilie 1 Front End

Front End Issues Paul Lilie 1

Front End Issues • Ortho-Mode Transducers (“OMTs”) • Solar Observing • Receiver Schedule 2

Front End Issues: OMTs Octave Bandwidth Quad-Ridge OMT & 90° Hybrid for L, S, and C-bands Four-Probe Design for X-band Boiföt OMT & Phase Shifter for Ku, K, Ka-bands Sloping Septum for Q-band Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 3

Quad-Ridge OMT HFSS Model Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 4

Quad-Ridge OMT Simulation Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 5

Quad-Ridge OMT Simulation Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 6

Quad-Ridge OMT Simulation Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 7

4 -Probe OMT HFSS Model Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 8

4 -Probe OMT Simulation Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 9

4 -Probe OMT Simulation Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 10

Solar Observing “Coupler-Fed” Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 11

Solar Observing Signal/Noise Ratio Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 12

Receiver Schedule Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 13

Receiver Schedule Ku-Band Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 14

Receiver Schedule Lilie EVLA Advisory Committee Meeting September 8 -9, 2003 15