Table of contents
- 1. Summary
- 2. Setup
- 2.1.1. VLBA
- 2.1.2. DBBC2 stations (Pv, On, Ys, Mh, Ef)
- 2.1.3. DBBC3 stations (Pico Veleta P3)
- 2.1.4. R2DBE stations (NOEMA)
Summary
Prior to the regular fringe test of session c191 a test for recording at 4 Gbps will be executed.
Schedule: f191a (UT 12:00 - 13:00) Rev 5 with R Cas and V1111 Oph masers
Participating stations: VLBA, Pv, On, Ys, Mh, Ef, Noema
Sky frequency band: 86012 - 86524 MHz (512 MHz)
Setup
VLBA
RDBE DDC mode with 4x128 MHz bands, dual-pol
sky start | sky stop | bandwidth | Sideband |
---|---|---|---|
86012 | 86140 | 128 | USB |
86140 | 86268 | 128 | USB |
86268 | 86396 | 128 | USB |
86396 | 86524 | 128 | USB |
DBBC2 stations (Pv, On, Ys, Mh, Ef)
All DBBC2 stations should use:
- DDC mode (firmware 107 beta3)
- 8x64 MHz bands, dual-pol.
- IF setup: identical to standard GMVA 2Gbps mode using 2 core boards
- Use 2nd Nyquist zone: 512 -1024 MHz
- dbbcform=astro
bbc freq | sideband | bandwidth | sky start | sky stop |
---|---|---|---|---|
960 | USB | 64 | 86460 | 86524 |
LSB | 64 | 86460 | 86396 | |
832 | USB | 64 | 86332 | 86396 |
LSB | 64 | 86332 | 86268 | |
704 | USB | 64 | 86204 | 86268 |
LSB | 64 | 86204 | 86140 | |
576 | USB | 64 | 86076 | 86140 |
LSB | 64 | 86076 | 86012 |
DBBC3 stations (Pico Veleta P3)
Pico Veleta will do simultaneous processing on the DBBC2 and DBBC3 backends.
- DDC_V mode (firmware V124)
- 16x32 MHz bands, dual-pol.
- 1st LO=92100 (dictated by the DBBC2 IF requirements)
- 2nd LO= 9048 (DBBC3 GComo)
- Use E90LI IFs (4-9GHz LSB)
- Baseband: 0-4 GHz USB => 83052 - 87052 sky freq
bbc freq | net sideband | bandwidth | sky start | sky stop |
---|---|---|---|---|
2992 | LSB | 32 | 86012 | 86044 |
USB | 32 | 86044 | 86076 | |
3056 | LSB | 32 | 86076 | 86108 |
USB | 32 | 86108 | 86140 | |
3120 | LSB | 32 | 86140 | 86172 |
USB | 32 | 86172 | 86204 | |
3184 | LSB | 32 | 86204 | 86236 |
USB | 32 | 86236 | 86268 | |
3248 | LSB | 32 | 86268 | 86300 |
USB | 32 | 86300 | 86332 | |
3312 | LSB | 32 | 86332 | 86364 |
USB | 32 | 86364 | 86396 | |
3376 | LSB | 32 | 86396 | 86428 |
USB | 32 | 86428 | 86460 | |
3440 | LSB | 32 | 86460 | 86492 |
USB | 32 | 86492 | 86524 |
R2DBE stations (NOEMA)
- Will use EHT mode: 1 x 2048 MHz dual-pol
- Manual setup not based on vex-file
- Tuning/IF selection based on the document supplied by Olivier.
- Sideband: net LSB
- Receiver : LSB
- Mixing stages: IF1 cover 4-8 GHz x 9 GHz LO2-A (LSB); filtered IF2 cover ~2-4 GHz x 4 GHz LO3 (LSB)
- Net sideband: RX LSB * (mix LSB)^2 = net LSB
- Antenna #4 on pad N05
XYZ : 4523970.486 468039.210 4460342.195 - Maser rate +4.52e-15 over 30 past days
- Clock offset ~12 nanosec
- Additional details of the NOEMA VLBI setup including local testing are on NOEMA April 2019
- Weather
- 03.04.2019 telescopes are stowed, snowfall and snowstorm
- 04.04.2019 bad weather in the morning until 6am but looks much better after, good chance of observing
- 04.04.2019 12 UT weather 3-4mm PWV variable and relatively fine so f191a observation was triggered (2013+370 only, no 3C454.3 because it fell into sun avoidance)
sky start | sky stop | bandwidth | sideband |
---|---|---|---|
85756 | 87804 | 2048 | net LSB |