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Fri Nov 1 17:54:47 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Ouput under inspection   
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Tue Nov 5 18:37:59 2019, anchal, DailyProgress, FSS, FSS Diagnostics - TTFSS Testpoint Spectrum Data
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Sat Nov 9 19:28:36 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Loop nonlinearity Test  
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Mon Nov 11 20:42:49 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Two Tone Test  
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Tue Nov 12 18:36:59 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Two Tone Third Order Intermodulation Test
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Thu Nov 14 12:19:32 2019, rana, DailyProgress, FSS, FSS Diagnostics - Two Tone Third Order Intermodulation Test
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Tue Nov 19 18:51:02 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Second-order Distortion Calculation 
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Mon Dec 9 19:54:44 2019, anchal, DailyProgress, FSS, FSS Diagnostics - How much distortion affects the functioning of PDH?
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Wed Nov 27 13:59:24 2019, anchal, DailyProgress, FSS, FSS Diagnostics - TTFSS TP1 TimeSeries
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Wed Nov 27 15:17:51 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Quick HF OLTF of NFSS
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Wed Nov 27 16:31:20 2019, rana, DailyProgress, FSS, FSS Diagnostics - Quick HF OLTF of NFSS
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Wed Dec 4 18:11:09 2019, anchal, DailyProgress, FSS, Free running laser frequency noise spectrum
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Thu Dec 5 18:25:11 2019, rana, DailyProgress, FSS, Free running laser frequency noise spectrum
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Tue Dec 17 18:29:58 2019, anchal, DailyProgress, FSS, Need for ISS?
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Wed Dec 18 18:40:32 2019, anchal, DailyProgress, FSS, Maybe the NPRO Laser isn't bad after all
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Wed Dec 18 22:03:17 2019, rana, DailyProgress, FSS, Maybe the NPRO Laser isn't bad after all
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Fri Dec 20 15:00:30 2019, anchal, DailyProgress, FSS, PZT, EOM to RIN TF Measurement
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Fri Dec 20 18:08:44 2019, anchal, DailyProgress, FSS, PZT, EOM to RIN TF Measurement Through FSS
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Tue Jan 7 17:59:20 2020, anchal, DailyProgress, FSS, NPMC TF
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Thu Dec 12 19:15:55 2019, anchal, DailyProgress, FSS, FSS Diagnostics - Beatnote Spectrum wrt Laser Power and Modulation Index
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Tue Dec 17 16:55:07 2019, anchal, DailyProgress, FSS, FSS Diagnostics - TTFSS North U7 Boost Stage Input-Output TimeSeries
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Tue Nov 12 11:39:48 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Ouput under inspection
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Fri Dec 13 16:24:02 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD Circuit Latest Available Photos   
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Fri Dec 13 17:44:05 2019, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Coupled Output Offset
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Mon Jan 13 19:04:38 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN009 (North RFPD) Notch Improvement Attempt  
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Tue Jan 14 18:19:33 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN009 (North RFPD) Notch Improved!  
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Thu Jan 16 11:17:15 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN010 (South RFPD) Notch Improvement Attempt  
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Thu Jan 16 20:18:44 2020, anchal, DailyProgress, FSS, FSS Diagnostics - SN010 (South RFPD) Notch Improved  
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Mon Jan 27 18:29:19 2020, anchal, DailyProgress, FSS, FSS Diagnostics - RFPD RF Out Spectrum
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Message ID: 2509
Entry time: Mon Jan 13 19:04:38 2020
In reply to: 2497
Reply to this: 2512
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Author: |
anchal |
Type: |
DailyProgress |
Category: |
FSS |
Subject: |
FSS Diagnostics - SN009 (North RFPD) Notch Improvement Attempt |
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I made the following changes to SN009:
- R15 -> 10k Ohms for increasing Test Input Power.
- R1 -> 226 Ohms
- R2 -> 25 Ohms (Two 50 Ohm resistors stacked in parallel)
- Added Ln, 2.2 uH fixed inductor.
- Added Cn 0.5-1.5 pF Trim Tunable Capactior.
- Ln and Cn are in series such that Ln + Cn is parallel to R1.
- Rewired the 5V line from one end of C3 to one end of C14 (U8-14) with yellow 20 AWG single core wire.

Measurements
- I used the setup in 40m to take light transfer function of the modified SN009.
- Method described in CTN:2247 was used.
Inference
- It turns out, however, that the placement of "active" notch didn't help at all. Infact, the ratio between peak and notch went from 30 to 20 :(
- I needed to reduce the values of R1 and R2 to ensure the notch doesn't effect the peak transimpedance much.
- During the tuning, I found that as I turned the screw on the capacitor, the transimpedance will just cycle through phases of low and high impedance. I dont' think I ever saw a very clear notch because of the new changes.
- I also tweaked the passive notch slightly to bring it closer to 72 MHz.
- I'll think more about what has happened and will try another pair of inductor and capacitor.
Data |
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