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Message ID: 14479     Entry time: Thu Mar 14 23:26:47 2019
Author: Anjali 
Type: Update 
Category: ALS 
Subject: ALS delay line electronics 

Attachment #1 shows the schematic of the test setup. Signal generator (Marconi) was used to supply the RF input. We observed the IF output in the following three test conditions.

  1. Observed the spectrum with FM modulation (fcarrier of 40 MHz and fmod of 221 Hz )- a peak at 221 Hz was observed.
  2. Observed the noise spectrum without FM modulation.
  3. Observed the noise spectrum after disconnecting the delayed output of the delay line. 
  • It is observed that the broad band noise level is higher without FM modulation (2) compared to that we observed after disconnecting the delayed output of the delay line (3).
  • It is also observed that the noise level is increasing with increase in RF input power. 
  • We need to find the reason for increase in broad band noise .
Attachment 1: test_setup_ALS_delay_line_electronics.pdf  34 kB  Uploaded Sun Mar 17 01:38:01 2019  | Hide | Hide all
test_setup_ALS_delay_line_electronics.pdf
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