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: 93.012 GHz (confirm that this is possible)
RF: E90LI (4-9GHz LSB)
2nd LO (DBBC3): 9.048 GHz
Sky freq: 83.964 - 88.060 GHz
| sky | 83964 | 84988 | 86012 | 87036 |
| after 1st DC | 9048 | 8024 | 7000 | 5976 |
| after 2nd DC | 0 | 1024 | 2048 | 3072 |
=> DBBC3 should use filter1= 2000-3000
Setup 260 GHz
Target band: 258.036 - 259.060
1st LO: 267.084 GHz (confirm that this is possible)
RF: ?? (assuming LSB 4-9 GHz)
2nd LO (DBBC3): 9048 GHz
Sky freq: 258.036 - 262132 GHz
| sky | 258036 | 259060 | 260084 | 261108 |
| after 1st DC | 9048 | 8024 | 7000 | 5976 |
| 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_Oct24.py dbbc3 (sets the 1GHz filters and the LO freqs)
Modules & Recorders
recorder2
slot 1: ??
slot 2: ??
recorder3
slot 1: ??
slot 2: ??
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)
