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 Fri Apr 15 12:17:39 2011, kiwamu, Update, LSC, 11MHz demod board : funny I-Q phase 
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 Fri Apr 15 15:15:08 2011, kiwamu, Update, LSC, 11MHz demod board : 90 degree splitter
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Sat Apr 16 02:00:14 2011, rana, Update, LSC, 11MHz demod board : 90 degree splitter
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Mon Apr 18 13:05:57 2011, kiwamu, Summary, LSC, demod board modification
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Mon Apr 18 14:11:44 2011, kiwamu, Update, LSC, RF status
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Thu Apr 21 21:24:41 2011, kiwamu, Update, LSC, demod board : new 90 deg splitter
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Thu Apr 21 21:46:22 2011, kiwamu, Update, LSC, demod board : new 90 deg splitter
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Fri Apr 22 11:08:50 2011, kiwamu, Update, LSC, demod board AS11 : amplitude imbalance
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Message ID: 4533
Entry time: Fri Apr 15 15:15:08 2011
In reply to: 4530
Reply to this: 4537
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| Author: |
kiwamu |
| Type: |
Update |
| Category: |
LSC |
| Subject: |
11MHz demod board : 90 degree splitter |
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[Rana, Koji, Kiwamu]
Moreover the amplitude of the I and Q signals are highly unbalanced, depending on the LO power again.
This implies the coil for a 90 degree splitting won't work at 11 MHz since the coil is home made and used to be designed for a specific frequency (i.g. 24.5 MHz).
We decided to use a Mini circuit 90 deg splitter instead. Steve will order few of them soon and we will test it out.
| Quote: |
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During checking the 11MHz demod boards I found that the I-Q relative phase showed funny LO power dependence.
It is now under investigation.
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