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 Tue Mar 2 19:52:46 2021, gautam, Update, LSC, REFL55 demod board rework
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 Wed Mar 3 22:13:05 2021, gautam, Update, LSC, REFL55 demod board rework
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Thu Mar 4 23:16:08 2021, Koji, Update, LSC, REFL55 demod board rework 
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Fri Mar 5 13:53:57 2021, gautam, Update, LSC, REFL55 demod board rework
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Fri Mar 5 15:31:23 2021, Koji, Update, LSC, REFL55 demod board rework
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Fri Mar 5 16:24:24 2021, gautam, Update, LSC, REFL55 demod board re-installed in 1Y2
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Fri Mar 5 22:25:13 2021, gautam, Update, LSC, PRMI 1f SB locking recovered
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Message ID: 15864
Entry time: Thu Mar 4 23:16:08 2021
In reply to: 15859
Reply to this: 15867
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| Author: |
Koji |
| Type: |
Update |
| Category: |
LSC |
| Subject: |
REFL55 demod board rework |
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A new hybrid splitter (DQS-10-100) was installed. As the amplification of the final stage is sufficient for the input level of 3dBm, I have bypassed the input amplification (Attachment 1). One of the mixer was desoldered to check the power level. With a 1dB ATTN, the output of the last ERA-5 was +17.8dBm (Attachment 2). (The mixer was resoldered.)
With LO3dBm. RF0dBm, and delta_f = 30Hz, the output Vpp of 340mV and the phase difference is 88.93deg. (Attachment 3/4, the traces were averaged) |
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