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Entry  Wed Aug 8 17:32:56 2018, Rich Abbott, General, Characterization, Modulation Index Test Setup at 40m Lab 40mLabModIndexSetup.pdf
    Reply  Thu Aug 9 11:24:29 2018, Koji, General, Characterization, Modulation Index Test Setup at 40m Lab modulation_depth.pdfmodulation_depth_zoom.pdf
Message ID: 306     Entry time: Thu Aug 9 11:24:29 2018     In reply to: 305
Author: Koji 
Type: General 
Category: Characterization 
Subject: Modulation Index Test Setup at 40m Lab 

[Rich Koji]

The impedances of the new LLO EOM were measured with the beat note setup at the 40m PSL (as described in the previous ELOG entry.

At the target frequencies (9.1MHz, 24.1MHz, 45.5MHz, 118.3MHz), the modulation responses were (0.09, 2.9e-3, 0.053, 0.021) rad/V.

This corresponds to the requirement for the driving power as follows.

Frequency
[MHz]
Response
[rad/V]
modulation depth 
required (LHO) [rad]
Required
drive [Vpk]
Required
drive [dBm]
    9.1 0.09 0.22 2.4 17.8
  24.1 2.9e-3   0.014 4.8 23.7
  45.5   0.053 0.28 5.3 24.5
118.3   0.021   0.010   0.48   3.6

 

Attachment 1: modulation_depth.pdf  761 kB  Uploaded Thu Aug 9 12:24:40 2018  | Show | Hide all | Show all
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modulation_depth_zoom.pdf
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