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operations:documentation:lba_dbbc_config [2013/03/28 05:18]
Jim Lovell [S-band, dual polarisation - 4 channels maximum]
operations:documentation:lba_dbbc_config [2013/03/28 05:35] (current)
Jim Lovell
Line 142: Line 142:
  
  
-===== S-band, dual polarisation ​- 4 channels maximum ​=====+===== S-band, dual polarisation =====
  
-This is the configuration that is most fraught with hazard. It requires either physical recabling of the dbbc to put the correct S-band inputs into CoMos A and B, or requires the following (untested) procedure. If you use recabling, follow the X-band notes but note the [[hardware:​dbbc.routing|IF inputs]] and LO frequencies ​will differ.+In this case the [[hardware:​dbbc.routing|IF inputs]] ​setup dictates that you will have S-band LCP through CoMo A input 4, and S-band RCP through CoMo C, input 2. Consequently,​ ''​ifd01'' ​will need to look like this (for Ke):
  
-If not re-cablingthen read on...+<​code>​ 
 +define ​ ifd01         ​13075124605x ​            
 +ifa=4,agc,​2,​38000 
 +ifc=2,​agc,​2,​36000 
 +lo= 
 +lo=loa,1900.00,​usb,​lcp,​off 
 +lo=lob,1900.00,​usb,​rcp,​off 
 +enddef 
 +</​code>​
  
-In this case the [[hardware:​dbbc.routing|IF inputs]] setup dictates that you will have S-band LCP through ​CoMo A input 4and S-band RCP through CoMo C, input 2+As BBCs 1 4 are assigned to CoMo A, 8 to B, 9 - 12 to and 13 - 16 to Dyou want to set up BBCs 01 - 04 for LCP and 09 - 12 for RCP. e.g.
  
 +<​code>​
 +define ​ dbbc01d ​      ​13075124605x ​           ​
 +bbc01=300.00,​a,​16.00
 +bbc02=316.00,​a,​16.00
 +bbc03=332.00,​a,​16.00
 +bbc04=348.00,​a,​16.00
 +bbc09=300.00,​c,​16.00
 +bbc10=316.00,​c,​16.00
 +bbc11=332.00,​c,​16.00
 +bbc12=348.00,​c,​16.00
 +enddef
 +</​code>​
  
 +The Mark5 mode needs to pass though BBCs 1-4 and 9 - 12, so it should look like this:
 +<​code>​
 +mk5b_mode=ext,​0x0FF000FF,​1
 +</​code>​
  
 +Note for a 4-channel observation you would only need to set BBCs 1,2,9 and 10 and the Mark5 mode would be
 +<​code>​
 +mk5b_mode=ext,​0x00F0000F,​1
 +</​code>​
  
  
-* Create a new configuration file in @@C:​\DBBC_CONF@@ of dbbcke if needed. If the experiment shares a configuration with a previous experiment (same frequencies,​ polarisations,​ channel order) then you should be able to use that. Otherwise, read on.  +===== S/X-band, ​single polarisation ===== 
-** Copy the basic layout from @@dbbc_config_file_lba.txt@@ to your new file and then edit the frequencies. Put all of the channels at one frequency in lines 1-4 and have lines 9-12 for the other polarisation. If the schedule shows the channels as alternating between RCP and LCP, tell the LBA chat (Cormac and Chris by email) that the recorded channel ordering will be different. +This setup is not dissimilar from S-band dual polarisation aboveexcept CoMo A would be used for X-band.
-** Start by checking the listed frequencies of each channel on the ATNF Wiki. In the corresponding entry in your experiment'​s config file change the frequency to (lower ​band edge-1900). As an exampleif channel 1's lower band edge is 2209 MHz then the first line in the @@dbbc_config_file_v999a.txt@@ is then @@1 dbbc2.bit 309.00 16@@ as is the ninth line. If channel 2's lower band edge is 2225 MHz then the second and tenth lines will be @@1 dbbc2.bit 325.00 16@@. +
-* %red%Load the configuration into the DBBC with the @@DBBC Client@@ command @@load=dbbc_config_file_v999a.txt@@ +
-* %red%Reconfigure the DBBC with @@reconfig@@ +
-* %red%Use the @@DBBC Client@@ to send the command @@dbbcform=geo@@ +
-* %red%Set up the IF inputs.  +
-** %red%Send these commands:​\\ +
-%red%@@dbbcifa=4,​agc,​2@@\\ +
-%red%@@dbbcifc=2,agc,2@@\\ +
-%red%@@pps_sync@@ +
-* %red%Confirm that the crossover switches are in the correct position. For SLCP/SRCPthe switches should ​be direct, while for SRCP/SLCP you need to have the switches crossed. If you do change this, ''​please leave a note for the next observer!''​. To check the status, it's easiest to do this by starting up a system monitor. Connect to ops4 with @@shh -observer@ops4@@ and run @@monitor_system.pl@@. Select the relevant telescope & check the settings of the "Cross-over switches"​ +
-* Edit the mk5b_mode line in the @@/​usr2/​proc/​v999ake.prc@@ file. For 4 channels only, it should read as @@mk5b_mode=ext,​0x00F0000F,​1@@.+
  
-!!!S-band, dual polarisation ​8 channels maximum +Here's an example of a S-RCP and X-RCP setup: 
-This is the configuration that is most fraught with hazardIt requires either physical recabling of the dbbc to put the correct S-band inputs into CoMos and B, or requires the following (untested) procedure. If you use recablingfollow the X-band notes but use 1900 when working out dbbc frequencies.+ 
 +<​code>​ 
 +define ​ ifd01         ​13075124605x ​            
 +ifa=1,​agc,​1,​38000 
 +ifc=2,​agc,​2,​36000 
 +lo= 
 +lo=loa,7600.00,​usb,​rcp,​off 
 +lo=lob,​1900.00,​usb,​rcp,​off 
 +enddef 
 +</​code>​ 
 + 
 +As BBCs 1 4 are assigned to CoMo A, 5 - 8 to B, 9 - 12 to C and 13 - 16 to Dyou want to set up BBCs 01 - 04 for RCP and 09 12 for S RCPe.g. 
 + 
 +<​code>​ 
 +define ​ dbbc01d ​      ​13075124605x ​            
 +bbc01=793.00,​a,​16.00 
 +bbc02=809.00,​a,​16.00 
 +bbc03=825.00,​a,​16.00 
 +bbc04=841.00,​a,​16.00 
 +bbc09=300.00,​c,​16.00 
 +bbc10=316.00,​c,​16.00 
 +bbc11=332.00,​c,​16.00 
 +bbc12=348.00,​c,​16.00 
 +enddef 
 +</​code>​ 
 + 
 +The Mark5 mode needs to pass though BBCs 1-4 and 9 - 12, so it should look like this: 
 +<​code>​ 
 +mk5b_mode=ext,​0x0FF000FF,​1 
 +</​code>​
  
-* Create a new configuration file in @@C:​\DBBC_CONF@@ of dbbcke if needed. If the experiment shares a configuration with a previous experiment (same frequencies,​ polarisations,​ channel order) then you should be able to use that one in the next step. Otherwise, read on.  
-** Copy the basic layout from @@dbbc_config_file_lba.txt@@ to your new file and then edit the frequencies. Put all of the channels at one polarisation in lines 1-4 and have lines 9-12 for the other polarisation. If the schedule shows the channels as alternating between RCP and LCP, tell the LBA chat (Cormac and Chris by email) that the recorded channel ordering will be different. 
-** Start by checking the listed frequencies of each channel on the ATNF Wiki. In the corresponding entry in your experiment'​s config file change the frequency to (lower band edge-1900). Using [[http://​www.atnf.csiro.au/​vlbi/​wiki/​index.php?​n=LBAApr2012.V444B|v444b]] as an example, channel 1's lower band edge is 2244 MHz. The first line in the @@dbbc_config_file_v444b.txt@@ is then @@1 dbbc2.bit 344.00 16@@. The second RCP channel has a lower band edge of 2260 MHz and so the second line is @@1 dbbc2.bit 360.00 16@@. Lines 9-12 in the file are the same as lines 1-4 (as this sets these channels to matched frequencies) 
-* %red%Load the configuration into the DBBC with the @@DBBC Client@@ command @@load=dbbc_config_file_v444b.txt@@ 
-* %red%Reconfigure the DBBC with @@reconfig@@ 
-* %red%Use the @@DBBC Client@@ to send the command @@dbbcform=geo@@ 
-* %red%Set up the IF inputs. ​ 
-** %red%Send these commands:\\ 
-%red%@@dbbcifa=4,​agc,​2@@\\ 
-%red%@@dbbcifc=2,​agc,​2@@\\ 
-%red%@@pps_sync@@ 
-* %red%Confirm that the crossover switches are in the correct position. For SLCP/SRCP, the switches should be direct, while SRCP/SLCP you need to have the switches crossed. If you do change this, ''​please leave a note for the next observer!''​. To check the status, it's easiest to do this by starting up a system monitor. Connect to ops4 with @@shh -X observer@ops4@@ and run @@monitor_system.pl@@. Select the relevant telescope & check the settings of the "​Cross-over switches"​ 
-* Edit the mk5b_mode line in the @@/​usr2/​proc/​v999ake.prc@@ file to read @@mk5b_mode=ext,​0x0FF000FF,​1@@ 
  
-!!!S/​X-band,​ single polarisation 
-* Create a new configuration file in @@C:​\DBBC_CONF@@ of dbbcke if needed. If the experiment shares a configuration with a previous experiment (same frequencies,​ polarisations,​ channel order) then you should be able to use that. Otherwise, read on.  
-** Copy the basic layout from @@dbbc_config_file_lba.txt@@ to your new file and then edit the frequencies. Start by checking the listed frequencies of each channel on the ATNF Wiki. In the corresponding entry in your experiment'​s config file change the frequency to (lower band edge-7600). Using [[http://​www.atnf.csiro.au/​vlbi/​wiki/​index.php?​n=LBASep2012.V469a|v469a]] as an example, channel 1's lower band edge is 8409 MHz. The first line in the @@dbbc_config_file_v469a.txt@@ is then @@1 dbbc2.bit 809.00 16@@. Repeat for all needed channels and leave unused channels alone. 
-* %red%Load the configuration into the DBBC with the @@DBBC Client@@ command @@load=dbbc_config_file_v469a.txt@@ 
-* %red%Reconfigure the DBBC with @@reconfig@@ 
-* %red%Use the @@DBBC Client@@ to send the command @@dbbcform=geo@@ 
-* %red%Set up the IF inputs. I've assumed that the observing frequencies for X-band are between 8112 and 8624 MHz which is normal for the LBA.  
-** %red%Send these commands:\\ 
-%red%@@dbbcifa=1,​agc,​1@@\\ 
-%red%@@dbbcifc=2,​agc,​2@@\\ 
-%red%@@pps_sync@@ 
-* %red%For RCP, confirm that the crossover switches are in the direct position. It's easiest to do this by starting up a system monitor. Connect to ops4 with @@ssh -X observer@ops4@@ and run @@monitor_system.pl@@. Select the relevant telescope & check the settings of the "​Cross-over switches"​. For LCP, the crossover switches should be crossed. 
-* Check the mk5b_mode line in the @@/​usr2/​proc/​v469ake.prc@@ file. For 8 channels it should be @@mk5b_mode=ext,​0x0FF000FF,​1@@. 
/home/www/auscope/opswiki/data/pages/operations/documentation/lba_dbbc_config.txt · Last modified: 2013/03/28 05:35 by Jim Lovell