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Entry  Mon Nov 12 15:18:34 2007, rob, Update, PSL, ISS ISS.png
    Reply  Mon Nov 12 23:44:19 2007, John, Update, PSL, ISS ISSfilter.jpg
Message ID: 97     Entry time: Mon Nov 12 23:44:19 2007     In reply to: 96
Author: John 
Type: Update 
Category: PSL 
Subject: ISS 

Quote:

After John soldered a 3.7 MHz notch filter onto the ISS board, I took a quick TF and RIN measurement. The out-of-loop RIN is attached, including a dark noise trace, and with the gain slider at 10dB. The UGF is 35kHz with a phase margin of 30deg. John is currently doing a more thorough inspection, and will detail his findings in a subentry.


No progress on the ISS tonight. I tried to implement a new filter (attached)to try and gain some phase before the notch. If anything this made things worse. More work is needed.

The ISS loop is off and the power is off at the chassis.
Attachment 1: ISSfilter.jpg  85 kB  | Show | Show all
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