ASTE Observations using MAC/WHSF + CATS345

Tuning Guide

MAC+CATS345

Figure shows a block diagram of the ASTE cabin from receiver to backend.

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1. Start tuning on COSMOS GUI

1. Take priority by pushing "THIS NODE"
2. Select observing table from "FILE LIST" or by putting its name into "FILE NAME"
3. CStar tuning by pushing "START TUNING". The tuning process automatically ends with the sound of Beethoven's Symphony No.5.
• This tuning process sets the following things:
1. Change backend to MAC
2. Combination between USB/LSB and E/Os (#1, #2)
3. Combination between arrays (A1, A2, A3, and A4) and IFs.
4. Frequency of 1st LO
5. Frequency of 2nd LO
6. Frequency of 3rd LO

2. Adjust receiver and E/O

1. Adjust 1st LO attenuator
• set automatically
1. aste-3c{asteobs} loatt_cats345_tune
• set manually
1. aste-3c{asteobs} loatt_cats345 (attenuator level)s
• check the current value
1. aste-3c{asteobs} loatt_cats345
2. Adjust input power levels for E/O #1 and #2
1. Stop chopper at R position
• aste-3c{asteobs} mmc1_rstop
2. aste-3c{asteobs} ifeo_tune 1 0.038
3. aste-3c{asteobs} ifeo_tune 2 0.054

3. Start tuning on COSMOS GUI

1. Confirm that the same observing table is selected in "FILE NAME"
2. Star tuning by pushing "START TUNING".
This process adjusts the input level for MAC.