File Name : Name of Device Table to save.

Fronend

RX : Receiver name : MULT2 (fixed)

Ftrack : Tracking frequency. If you observe only one spectral line, enter the rest frequency of the line.
*For high z objects, enter the frequency corrected for z. In that case, the velocity of the source defined in Source Table should be 0 km/s.

U/L : Select upper sideband (USB) or lower sideband (LSB).

Fif : Ftrack is converted to Fif by 1LO. (2.0-2.6 GHz)

Syn : Number of synthesizer. This is set automatically.

Backend (MAC = Multi-beam Auto Correlator)

Band Width : Select band width of spectrometers (4 MHz, 8 MHz, 16 MHz, 32 MHz, 512 MHz). For 4 MHz, 8MHz, and 16 MHz, a part of the spectrometer is used. Alphabet indicates the difference of the frequency range of the spectrometer.

FCenter : Frequency which corresponds to the center channel of MAC. If Ftrack is the rest frequency of the spectral line, enter the rest frequency to detect the line at the center of MAC.

Frontend Options

RX Init Angle : Position angle of the rotator on the specified coordinate system in Scan Table.

Backend options

Channel : Number of channel which you use. If you select 9, inner 9 channels (3 × 3) are used. You can denfine the channels randomly by selecting Random.

Window of LAG : Window function.  Frequency resolution (df) is calculated by

df = A * Band Width / 1024 (Hz),

where A is 1.21 (None), 2.00 (HANN), 1.82 (HAMM), 2.30 (BLCK).

AOS (H,W) : AOS Window appears to set parameters.

• AOS

Fig 5.3.2  AOS Window

Usage : You can use MAC and AOS simultanoeously. But, both of AOS-H and AOS-W can not be used simultaneously with MAC.

MAC : Auto Correlator.
AOS-H : AOS-High.
AOS-W : AOS-Wide.

Att : The power from the black body at room temperature for intensity calibration is attenuated by the rate defined here. This parameter depends on the system temperature (R-Sky value (dB)). You should decide the value after checking the system temperature at RX tuning.

BPF2 : Band pass filter with a bandwidth of 100 MHz (50 MHz step).  Select an adequate filter, which passes the frequency that you observe, from the list shown by pushing the button. The number indicates the lower frequency of the pass band (e.g., 2.20 means 2.20-2.30 GHz).

4LO : Frequency of 4th local oscillator (AOS-High : 1600 - 2099 MHz,  AOS-Wide : 1950MHz fixed). Fif is converted to Fif - F(4LO) (- 540 MHz : for High). Confirm that the frequency that you observe is in the frequency range of AOS (High : 45-85 MHz, Wide : 250-500 MHz) after the conversion. If Ftrack is the rest frequency of the spectral line, F(4LO) should be Fif - 540 MHz - 65 MHz to detect the line at the center of AOS-High, where 65 MHz is the center frequency of AOS-High.

Fcenter : Frequency which corresponds to the center channel of AOS. If Ftrack is the rest frequency of the spectral line, enter the rest frequency to detect the line at the center of AOS.