During the NZ trip, Gino advised us that the DBBC performance could be improved by adjusting the DBBCIF power targets. The recommended method was to adjust the IF powers by changing the attenuation to maximise the apparent aplitude of a tone in the BBC channels. This has been carried out for Hb, Ke and Yg, using the pcal tones as a reference. The improvement in apparent magnitude (as estimated through Haystack's bpcal software) ranges between ~30 - 300% over the default values. The table below lists the new targets. A test is planned to see if the improvements in apparent magnitude of the tones carries across to an improved SNR in VLBI observations.
| Hb CoMo | Previous Target | New Target |
|---|---|---|
| A | 55000 | 32000 |
| B | 55000 | 40000 |
| C | 55000 | 30000 |
| D | 55000 | 30000 |
| Ke CoMo | Previous Target | New Target |
|---|---|---|
| A | 55000 | 35000 |
| B | 55000 | 28000 |
| C | 55000 | 28000 |
| D | 51000 | 40000 |
| Yg CoMo | Previous Target | New Target |
|---|---|---|
| A | 55000 | 26000 |
| B | 55000 | 26000 |
| C | 55000 | 45000 |
| D | 55000 | 31000 |