Table of contents
System schematics
Setup 86 GHz
Target band: 86.000 - 87.024
1st LO: 93.0 GHz
RF: LSB 5-9 GHz
2nd LO (DBBC3): 9.048 GHz
Sky freq: 83.952 - 88.048 GHz
| sky | 83952 | 85976 | 86000 | 87024 |
| after 1st DC | 9048 | 8024 | 7000 | 5976 |
| after 2nd DC | 0 | 1024 | 2048 | 3072 |
=> DBBC3 should use filter1= 2000-3000
Setup 230 GHz
Target band: 215.000 - 216.024
1st LO: 221.010 GHz
RF: LSB 5-9 GHz
2nd LO (DBBC3): 8.058 GHz
Sky freq: 211.962 - 216.058 GHz
| sky | 212952 | 213976 | 215000 | 216024 |
| after 1st DC | 8058 | 7034 | 6010 | 4986 |
| after 2nd DC | 0 | 1024 | 2048 | 3072 |
=> DBBC3 should use filter1 = 2000-3000
DBBC3 setup
- load normally the OCT_120 firmware
- run dbbc3ctl.py and do check system all
- run /home/oper/rottmann/dbbc3/utilities/setupFPT_Nov22.py dbbc3 (sets the 1GHz filters and the LO freqs)
Modules & Recorders
recorder2
slot 1: MPIH%028/48000
slot 2: MPIH%029/48000
recorder3
slot 1: MPIH%034/48000
slot 2: EHT%0036/48000
module setup (do on both 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
Line injection test (2024 Nov 11th)
230 GHz signal chain
Line freq: 5754 MHz (corresponds to 215.256 GHz sky)
connected to boards A and B (corresponding to IF2 and IF4)
Line is expected to appear at 256 MHz in the filtered band. Difference in Pol. power comes from mislegnment of tone-injection horn.
86 GHz signal chain
Line freq 6744 MHz (corresponds to 86.256 GHz sky)
connected to boards C and D (corresponding to IF1 and IF3)
Line is expected to appear at 256 MHz in the filtered band. Difference in Pol. power comes from mislegnment of tone-injection horn.
Action
- Repeat phase test and tone injection if possible before observation
Comments