Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

1

Front End Issues

Paul Lilie

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

2

Front End Issues

• Ortho-Mode Transducers (“OMTs”)

• Solar Observing

• Receiver Schedule

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

3

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 MeetingSeptember 8-9, 2003

4

Quad-Ridge OMTHFSS Model

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

5

Quad-Ridge OMT Simulation

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

6

Quad-Ridge OMT SimulationL-Band OMT Loss (HFSS Simulation)

Room-Temperature Copper

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2

GHz

Dissipation + Mismatch Dissipation Onlyvpyrlen5.xls

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

7

Quad-Ridge OMT Simulation

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

8

4-Probe OMTHFSS Model

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

9

4-Probe OMTSimulation

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

10

4-Probe OMTSimulation

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

11

Solar Observing “Coupler-Fed”

Dewar

LNA

"HNA"

"HNA"

Attenuator

NoiseDiode

LNACoupler

Coupler

Splitter

Post-Amplifier

Post-Amplifier

RCPInput

LCPInput

RCPOutput

LCPOutput

Switch

Switch

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

12

Solar ObservingSignal/Noise Ratio

1 - 2 GHz Band ("L-Band")

-60.0

-50.0

-40.0

-30.0

-20.0

-10.0

0.0

10.0

20.0

30.0

-20 -10 0 10 20 30 40 50 60 70 80

Input, dB(Kelvin)

dB

Rcvr SNR

Cal 'Gain'

1 Jy

300 K

Quiet Sun

Active Sun

Flare

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

13

Receiver Schedule

New Receiver Build Plan

0

5

10

15

20

25

30

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

Year

1 -2 GHz

2 - 4 GHz

4 - 8 GHz

8 - 12 GHz

12 - 18 GHz

18 - 26 GHz

26 - 40 GHz

40 - 50 GHz

evlaFOM.xls

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

14

Receiver ScheduleKu-Band

12 - 18 GHz Receiver Plan

0

5

10

15

20

25

30

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

Year

Old Receivers

New Receivers

Total Receives

Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003

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Receiver Schedule