Select a receiver from the list shown by pushing the button. Both DASH345 and BAND8 are available for line observation in the 2015 season.
Ftrack :
Tracking frequency. You can define up to the 6th decimal place.
Single line obs. : Enter the rest frequency of the line.
Multi-line obs. (with single receiver) : Ftrack should be near the average of the rest frequencies of the lines.
For high z objects, enter the frequency corrected for Doppler shift. In that case, the velocity of the source defined in "Source Table" should be 0.
U/L :
Select upper sideband (USB)
or lower sideband (LSB).
The common selection is listed below.
RX
Frequencyrange (GHz)
Sideband
DASH3
321 - 376 GHz
USB
BAND8
387 - 498 GHz
USB
POL&SB :
Select input IFs of MAC from outputs of RX.
IF
Receiver output
P0U
Pol0 USB
P0L
Pol0 LSB
P1U
Pol1 USB
P1L
Pol1 LSB
Fif :
Ftrack is
converted to Fif by 1st LO.
Set Fif so as to be in the range of 4.5-7 GHz.
The commonly used values are listed below.
RX
Fif (GHz)
DASH3
6
BAND8
6
Syn :
Select synthesizer used as 1st LO.
RX
Synth
DASH3
B
BAND8
B
IF :
Select IF# for each sideband (Default: USB-->IF1, LSB-->IF2).
DSB Factor :
Scaling factor of intensity. You should choose one depending on RX.
2.0 (DSB Rx) : For observations with DSB RX.
1.0 (SSB Rx) : Default. For observations with 2SB/SSB RX (e.g. DASH3, BAND8).
Backend
IF :
Select IF# which pass the line for which you want to use
the spectrometer.
2nd LO :
Set 2nd LO frequency. (Default: 8300 [MHz])
F2ndLO = Fif +/- (Ftrack - Fcenter) + 2.300 GHz,
where the sign of the second term is "+" for LSB and "-" for USB.
Band Width :
Select Band Width of spectrometers. Wide mode (512 MHz) and High mode (128 MHz) can be used.
Fcenter :
Frequency which corresponds to the center channel of
the digital backend (AC). You can define up to the 6th decimal place.
U/L :
Select upper sideband (USB) or lower sideband (LSB).
Qlook :
If you want use the qlook system during observations, check the on/off button for each spectrometer.
In addition, you can set the binning channels of each spectrum if you want.
Single line obs. : Enter the rest frequency of the observed line to detect the line at the center of AC.
Backend options
Window of LAG :
Window function. Frequency resolution (df) is calculated by
df = A ¡ß Band Width ¡à 1024 (Hz),
where A is
1.21 (None),
2.00 (Hanning),
1.82 (Hamming),
2.30 (Blackman).
