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 Wed Apr 24 16:01:55 2019, anchal, DailyProgress, FSS, Time series and spectrum analysis of RFout of SCavReflRFPD near resonance 
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 Fri Apr 26 14:34:03 2019, anchal, DailyProgress, FSS, Time series and spectrum analysis of RFout of SCavReflRFPD near resonance
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Sun Apr 28 22:31:39 2019, rana, DailyProgress, FSS, RF beats
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Tue Apr 30 18:07:49 2019, anchal, DailyProgress, FSS, Spectrum of RFout from South Cavity Reflection RFPD
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Wed May 8 20:03:43 2019, anchal, DailyProgress, FSS, FSS PDH Error Signal on South Path is in good health
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Message ID: 2328
Entry time: Fri Apr 26 14:34:03 2019
In reply to: 2326
Reply to this: 2330
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| Author: |
anchal |
| Type: |
DailyProgress |
| Category: |
FSS |
| Subject: |
Time series and spectrum analysis of RFout of SCavReflRFPD near resonance |
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I think I figured the source of this 281 kHz peak. 281 kHz ≈ 37 MHz - 36.72 MHz, so it is the beat signal between 37 MHz and the 36.72 MHz signals. I think I should tune the RFPD more next time I open the cage to bring its resonance closer to 37 MHz.
| Quote: |
- Next, I took a board spectrum from 0-500 kHz to spot that 290kHz we saw in time series data. Indeed there is a peak at 281 kHz of -66.36 dBm. This looked like a bigger oscillation in time series (~50 mVpp => -22 dBm but again, this data taking method is not really good). There are other nearby peaks at ~269 kHz and 2~284 kHz. I'm not sure why these peaks are here. But they can not be some standing wave in the cable as it will require ~700m long cable.
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