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hardware:dbbc [2012/03/29 02:43]
Stuart Weston [Installation on a Compact Flash Card]
hardware:dbbc [2012/04/10 02:11] (current)
Stuart Weston
Line 5: Line 5:
   * [[hardware:​dbbc.calibration| DBBC Calibration procedure]]   * [[hardware:​dbbc.calibration| DBBC Calibration procedure]]
   * [[hardware.dbbc.wiring| DBBC back-end wiring configuration]]   * [[hardware.dbbc.wiring| DBBC back-end wiring configuration]]
 +
 +  * {{:​hardware:​dbbc-command-set-v2.3.pdf| DBBC Command Set V2.3}}
 +
 +  *{{:​hardware:​s23-tuccari.pdf|A Flexible Environment for VLBI and Space Research: Digital Receiver and Back-end}}
  
 ====== DBBC Configuration ====== ====== DBBC Configuration ======
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 Ran "DBBC control",​ answered "​y"​ to reconfiguration. Sampling modules were re-initialised and resumed processing with the 1PPS sync. Ran "DBBC control",​ answered "​y"​ to reconfiguration. Sampling modules were re-initialised and resumed processing with the 1PPS sync.
 +
 +=== DBBC Callibration ===
 +
 +* [[hardware:​dbbc.callibration|DBBC Callibration]]
 +
 +=== Mapping of channels to VSI ===
 +
 +The DBBC has 4 channels per IF board (we have 4 IF boards), each of these channels has an upper and lower sideband. The VSI interface has 32 bit streams, for 2 bit we have Sign bit and Magnitude bit. So we can't record all channels at 2bit. The question is how these channels and bands are mapped to the VSI interface from the DBBC.
 +There are two channel mappings that are implemented in the DBBC - astro and geo. You can select these with the command "​dbbcform=geo"​ or "​dbbcform=astro"​. By default, it's in geodetic mode but you can query that with "​dbbcform"​. I've included the channel mapping info we were given by Gino. With the "Mark 4 sampler output column",​ the code represents the base-band converter number, whether it is the Upper or Lower sideband, and whether it is the Sign or Magnitude bit. You can use the bitmasking in the mk5 to select a subset of channels and/or 1-bit sampling. For the first 4 channels with upper sidebands (dbbc01, dbbc02, dbbc03, dbbc04) at 2-bit sampling (for LBA-type observations) the mask is 0x000000ff and for 16 channels at 1-bit it is 0x55555555.
 +
 +{{:​hardware:​mapping-mk5b.pdf|Original Modes}}
 +
 +{{:​hardware:​mapping-2-mk5b.pdf|May 2011: new test and VSI modes added}}
 ====== DBBC 3rd Party Utilities & Software ====== ====== DBBC 3rd Party Utilities & Software ======
  
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 * [[hardware:​dbbc.record_config_mk5b|Recording Configuration DBBC And Mark5B+]] * [[hardware:​dbbc.record_config_mk5b|Recording Configuration DBBC And Mark5B+]]
  
 +====== OS Installation ======
  
-====== ​Linux OS Installation ======+===== MS Windows XP ===== 
 + 
 +* [[hardware:​dbbc.windowsxp|MS Windows XP OS Installation]] 
 + 
 +===== Linux OS Installation ​=====
  
 * [[hardware:​dbbc.linux|Linux OS Installation]] * [[hardware:​dbbc.linux|Linux OS Installation]]
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 * [[hardware.dbbc.boards| DBBC commercial boards used]] * [[hardware.dbbc.boards| DBBC commercial boards used]]
  
 +====== Related Links =====
 +
 +{{http://​www.noto.ira.inaf.it/​index.php/​project|DBBC project home page}}
 +
 +{{https://​deki.mpifr-bonn.mpg.de/​Cooperations/​dBBC|Bonn DBBC Wiki}}
 +
 +=== TOW 2011 ===
 +
 +{{ftp://​ivscc.gsfc.nasa.gov/​pub/​TOW/​tow2011/​notebook/​Tuccari.Sem.pdf|DBBC Overview}}
 +
 +=== DBBC3 ===
 +
 +{{http://​www.oan.es/​gm2012/​pdf/​oral_id_130.pdf|DBBC3 - A full digital implementation of the VLBI2010 backend}}
/home/www/auscope/opswiki/data/attic/hardware/dbbc.1332989018.txt.gz · Last modified: 2012/03/29 02:43 by Stuart Weston