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Wed Apr 3 17:40:18 2013, Jamie, Configuration, Electronics, putting together a 110 MHz LSC demod board
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Wed Apr 3 18:41:22 2013, Jamie, Configuration, Electronics, putting together a 110 MHz LSC demod board
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Wed Apr 3 22:26:51 2013, rana, Configuration, Electronics, putting together a 110 MHz LSC demod board
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Thu Apr 4 14:37:15 2013, Jamie, Configuration, Electronics, putting together a 110 MHz LSC demod board
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Mon Aug 26 18:55:18 2013, Jenne, Configuration, Electronics, putting together a 110 MHz LSC demod board for AS
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Mon Aug 26 20:13:17 2013, rana, Configuration, Electronics, putting together a 110 MHz LSC demod board for AS
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Tue Aug 27 15:31:48 2013, Jenne, Configuration, Electronics, putting together a 110 MHz LSC demod board for AS
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Tue Sep 3 21:10:36 2013, Jenne, Configuration, Electronics, putting together a 110 MHz LSC demod board for AS
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Tue Aug 27 17:32:52 2013, Jenne, Configuration, Electronics, putting together a 110 MHz LSC demod board for AS
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Tue Aug 27 18:21:35 2013, Jenne, Configuration, Electronics, 110 MHz LO options
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Tue Aug 27 18:58:52 2013, Koji, Configuration, Electronics, 110 MHz LO options
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Mon Sep 2 16:46:32 2013, Jenne, Update, Electronics, RF distribution box is on the bench
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Mon Sep 2 18:06:21 2013, Jenne, Update, Electronics, RF distribution box: 110 MHz LO options  
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Tue Sep 3 21:08:13 2013, Jenne, Update, Electronics, RF distribution box: 110 MHz LO options
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Wed Sep 4 16:06:40 2013, Jenne, Update, Electronics, RF distribution box: Reinstalled
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Wed Sep 4 21:44:54 2013, Not Jenne, Update, Electronics, RF distribution box: Reinstalled
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Message ID: 9069
Entry time: Tue Aug 27 15:31:48 2013
In reply to: 9067
Reply to this: 9100
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Author: |
Jenne |
Type: |
Configuration |
Category: |
Electronics |
Subject: |
putting together a 110 MHz LSC demod board for AS |
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Quote: |
Quote: |
I have modified one of the spare demod boards that was sitting above the electronics bench (the one which was unlabeled - the others say 33MHz, 55MHz and 165MHz) to be the new AS110 demod board. In place of the T1 coil, and the C3 and C6 resistors, I have put the commercial splitter PSCQ-2-120+. In place of U5 (the low pass for the PD input) I have put an SCLF-135+.
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OK, but what kind of filter should we be actually using? i.e. what purpose the 135 MHz low pass serve in contrast to a PHP-100+ ?
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Hmmm. Indeed. This is just cutting off higher frequency stuff, but anything from other lower sidebands still gets through. I should actually stick in the SXBP-100's, which will band pass from 87-117 MHz. These have an insertion loss at 100 MHz of 1.64 dB.
Jamie ordered 2 of these, so I can put one in each of AS110 and POP110. |