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lbaops:lbajun2013:v490a

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lbaops:lbajun2013:v490a [2013/06/13 13:41]
sellings
lbaops:lbajun2013:v490a [2015/12/18 16:38] (current)
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 ==== Hobart, Ceduna :  ==== ==== Hobart, Ceduna :  ====
  
-The 4 x 16 MHz bandpass setup requires feeding two separate LOs into IFP#1 and #2 on the DAS/​frequency translator. ​ For both Hobart and Ceduna the LOs should be set to 706 MHz (IFP#1) and 206 MHz (IFP#2) for the 4 x 16 MHz setup and 495 MHz for the 2 x 16 MHz setup. ​ For Hobart use 16.37 GHz as the Agilent frequency and for Ceduna use 17.47 GHz.+The 4 x 16 MHz bandpass setup requires feeding two separate LOs into IFP#1 and #2 on the DAS/​frequency translator. ​ For both Hobart and Ceduna the LOs should be set to 706 MHz (IFP#1) and 206 MHz (IFP#2) for the 4 x 16 MHz setup and 495 MHz for the 2 x 16 MHz setup. ​ For Hobart use 16.37 GHz as the Agilent frequency and for Ceduna use 17.47 GHz.  For the 4x16 MHz setup 880.2 and 900.2 MHz should give coherence in IF#1 and IF#2 respectively,​ while for the 2x16 MHz use 888.64 MHz to check coherence.
  
 The level into IF#2 will change significantly between the two setups. ​ Set the level into the DAS so that it is within range for both setups. ​ Setup the system temperature measurement so that it works for both IFs for the v490a.1cm setup - it doesn'​t matter if the system temperature measurement doesn'​t work for the second IF during the ICRF observations as these are only to calibrate the delay. ​ Please don't change the attenuation into the DAS when the setup changes as that may change the delay.  ​ The level into IF#2 will change significantly between the two setups. ​ Set the level into the DAS so that it is within range for both setups. ​ Setup the system temperature measurement so that it works for both IFs for the v490a.1cm setup - it doesn'​t matter if the system temperature measurement doesn'​t work for the second IF during the ICRF observations as these are only to calibrate the delay. ​ Please don't change the attenuation into the DAS when the setup changes as that may change the delay.  ​
lbaops/lbajun2013/v490a.1371094906.txt.gz · Last modified: 2015/12/18 16:38 (external edit)