Front End Issues
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Transcript of Front End Issues
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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Front End Issues
Paul Lilie
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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Front End Issues
• Ortho-Mode Transducers (“OMTs”)
• Solar Observing
• Receiver Schedule
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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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
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Quad-Ridge OMTHFSS Model
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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Quad-Ridge OMT Simulation
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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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
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Quad-Ridge OMT Simulation
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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4-Probe OMTHFSS Model
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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4-Probe OMTSimulation
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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4-Probe OMTSimulation
Lilie EVLA Advisory Committee MeetingSeptember 8-9, 2003
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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
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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
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Receiver Schedule
New Receiver Build Plan
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5
10
15
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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
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Receiver ScheduleKu-Band
12 - 18 GHz Receiver Plan
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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