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40m Log |
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Wed Nov 18 22:49:06 2020, gautam, Update, ASC, Some thoughts about AS WFS electronics
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Sun Nov 22 21:09:37 2020, gautam, Update, ASC, Planned mods for WFS head  
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Wed Nov 25 18:18:41 2020, gautam, Update, ASC, Planned mods for WFS head 
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Sat Nov 28 21:44:53 2020, rana, Update, ASC, Planned mods for WFS head
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Thu Dec 10 22:46:57 2020, gautam, Update, ASC, WFS head assembled 
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Thu Dec 17 15:23:56 2020, gautam, Update, ASC, WFS head characterization    
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Wed Nov 25 18:30:23 2020, gautam, Update, ASC, Some thoughts about AS WFS electronics
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Wed Dec 2 23:07:19 2020, gautam, Update, ASC, Electrical LO signal for AS WFS
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Thu Dec 3 11:02:35 2020, rana, Update, Electronics, Electrical LO signal for AS WFS
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Thu Dec 3 13:55:52 2020, Koji, Update, ASC, Electrical LO signal for AS WFS
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Thu Dec 3 20:38:46 2020, gautam, Update, ASC, Electrical LO signal for AS WFS  
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Thu Dec 3 21:14:38 2020, Koji, Update, ASC, Electrical LO signal for AS WFS
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Thu Dec 3 21:44:49 2020, gautam, Update, ASC, Electrical LO signal for AS WFS
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Fri Dec 4 03:02:40 2020, Koji, Update, ASC, Electrical LO signal for AS WFS
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Fri Dec 4 22:41:56 2020, gautam, Update, ASC, Freq Gen Box revamp
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Sat Dec 5 20:44:35 2020, gautam, Update, ASC, Freq Gen Box re-installed 6x
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Mon Dec 7 12:38:51 2020, gautam, Update, IOO, IMC loop char  
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Mon Dec 7 22:54:30 2020, gautam, Update, LSC, Modulation depth measurement
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Sat Jan 16 18:59:44 2021, gautam, Update, LSC, Modulation depth measurement   
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Message ID: 15707
Entry time: Fri Dec 4 03:02:40 2020
In reply to: 15706
Reply to this: 15710
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Author: |
Koji |
Type: |
Update |
Category: |
ASC |
Subject: |
Electrical LO signal for AS WFS |
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1. That's true. But we are already in that regime with the Var attn at 0dB, aren't we? We can reduce the input to the amp by 1-2dBm sacrificing the EOM out by that amount (we can compensate this for the demo out by removing the 1dB attn).
2. Not 100% sure but one possible explanation is that we wanted to keep the Marconi output large (or as large as possible) to keep the SNR between the signal and the noise of the driver in Marconi. The attenuator is less noisy compared to the driver noise.
3. My guess is that theoretically we were supposed to have 13dBm input and 20dBm output in design. However, the actual input was as such. We can restore it to the 13dBm input. |