FPT Test Oct 2024

Overview

Dual-frequency test observations between PV and APEX in conjunction with the GMVA session C242.

System schematics

Setup 86 GHz

Target band: 86.012 - 87.036

1st LO:     93.012 GHz (confirmed OK)

RF:           E90LI (4-9GHz LSB)   

2nd LO (DBBC3): 9.048 GHz

Sky freq:    83.964 - 88.060 GHz

=> DBBC3 should use filter1= 2000-3000

Setup 260 GHz

Target band: 258.036 - 259.060

1st LO:     267.084 GHz (confirmed OK)

RF: ?? (assuming LSB 4-9 GHz)

2nd LO (DBBC3): 9048 GHz

Sky freq:    258.036 - 262132 GHz
 

=> DBBC3 should use filter1 = 0-1000

DBBC3 setup

• load the OCT_120 firmware (from the DBBC3 desktop)
• Check the setup files (located in c:\DBBC_CONF\OCT_D_120)
  • When using 1GHz filters the vsi_bitmask needs to be adapted in the core3h config files for all the boards running a 1 GHz filter. Files with the correct setups have been prepared e.g.: oct_D_1GHz_core3H_1.fila10g (for board A). These files need to referenced in the main config file: dbbc3_config_file_oct_D_120.txt. In the setup folder:
    • delete dbbc3_config_file_oct_D_120.txt
    • copy dbbc3_config_file_oct_D_120_copy_1GHz.txt -> dbbc3_config_file_oct_D_120.txt
  • Note: in order to restore the correct setup with 2 GHz filters after the FPT test do:
    • delete dbbc3_config_file_oct_D_120.txt
    • copy dbbc3_config_file_oct_D_120_copy_2GHz.txt -> dbbc3_config_file_oct_D_120.txt
• verify the setup from the control computer:

/home/oper/rottmann/dbbc3/utilities/dbbc3ctl.py dbbc3
and do 
check system all

• run /home/oper/rottmann/dbbc3/utilities/setupFPT_Oct24.py dbbc3  (sets the 1GHz filters and the LO freqs)

Modules & Recorders

group=new:12
input_stream=add:stream1:vdif:8224:50:42:eth3:::1
input_stream=add:stream2:vdif:8224:50:42:eth5:::2
input_stream=commit
group=open:12

Record tone in recorders

From recorder2/3:

plot_dbbc3_generic.sh
(Note labelling will always be 0-1024 MHz regardless if the real position in the basband of the DBBC3)

Action