Table of contents
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: 93.0 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: EHT%0017
slot 2: EHT%0018
recorder3
slot 1: EHT%0019
slot 2: EHT%0020
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 (Nov 10th)
230 GHz signal chain
Line freq: 5810 MHz (corresponds to 215.2 GHz sky)
connected to boards A and B (corresponding to IF2 and IF4)
Line is expected to appear at 2248 MHz in base band and at 200 MHz in the filtered band
86 GHz signal chain
Line freq 6800 MHz (corresponds to 86.2 GHz sky)
connected to boards C and D (corresponding to IF1 and IF3)
Line is expected to appear at 2248 MHz in base band and at 200 MHz in the filtered band
Action
Change GMVA modules to recorder1 (SS)Insert new modules to recorders 2 & 3 (SS)update google sheet (SS)
