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cso:instruments:heterodyne:heterodyne [2014-05-07 22:54] sradford |
cso:instruments:heterodyne:heterodyne [2014-05-07 22:54] (current) sradford |
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+ | ====== Heterodyne Systems ====== | ||
+ | Instructions for [[observing]]. | ||
+ | |||
+ | Heterodyne systems at the CSO permit high resolution spectroscopy in the atmospheric windows from 177 to 920 GHz. | ||
+ | |||
+ | ===== Receivers ===== | ||
+ | |||
+ | ^ Characteristics ^^^^^^^^ | ||
+ | ^ Receiver ^^ Range ^ IF BW ^ //T//<sub>rx</sub> ^ Tuning ^ Remarks ^ Status ^ | ||
+ | | ::: | ::: | [GHz] | [GHz] | DSB [K] | ::: | ::: | ::: | | ||
+ | | ||||||| | ||
+ | | Sidecab | 230 | 177-210 | 4-8 | 40 | auto. | Low freq. subband requires\\ add'l LO filter. Consult staff. | operational | | ||
+ | |:::| ::: | 210-286 | ::: | ::: | ::: | | ::: | | ||
+ | |:::| 345 | 315-380 | 1-2 | 90 | manual | | ::: | | ||
+ | |:::| 460 | 382-532 | 4-8 | 40 | auto. | | ::: | | ||
+ | |:::| 650 | 620-730 | 1-2 | 230 | manual | | ::: | | ||
+ | | ||||||| | ||
+ | | Cassegrain | Barney | 300-410 | 4-8 | 50 | manual | | //limited availability// | | ||
+ | |:::| 850 | 810-900 | 1-2 | 350-450 | manual | or Nasymth | //limited availability// | | ||
+ | | ||||||| | ||
+ | | | <del> Zrex </del> | <del> 200-290 </del> | <del> 4-12 </del> | <del> 160-50 </del> | <del>manual</del> | <del> aka Frank's receiver </del> | //decommissioned// | | ||
+ | |||
+ | |||
+ | ^ Measured Performance ^^^^^^^^^^ | ||
+ | ^ Receiver ^^ Line ^ Freq. ^ SB ^ //Y// ^ //T//<sub>sys</sub> ^ //τ//<sub>225</sub> ^ ZA ^ Date ^ | ||
+ | | ::: || ::: | [GHz] | | | SSB [K] | | [deg] | ::: | | ||
+ | | |||||||||| | ||
+ | | Sidecab | 230 | <sup>12</sup>CO(2-1) | 230.5 | Up | | 220 | 0.126 | 15° | 2013-03-05 | | ||
+ | |:::| 345 | <sup>12</sup>CO(3-2) | 345.8 | Up | 1.9 | 815 | 0.111 | 33° | 2013-04-04 | | ||
+ | |:::| 461 | <sup>12</sup>CO(4-3) | 461.0 | Lo | | 1240 | 0.059 | 17° | 2013-03-06 | | ||
+ | |:::| 650 | |||||||| | ||
+ | | |||||||||| | ||
+ | | Cassegrain | Barney | |||||||| | ||
+ | |:::| 850 | |||||||| | ||
+ | |||
+ | |||
+ | ==== Notes ==== | ||
+ | |||
+ | * All receivers are single polarization and double side band. | ||
+ | * Measured //T//<sub>sys</sub> at indicated zenith angle (ZA). | ||
+ | |||
+ | * [[sidecab_rxb]] | ||
+ | * [[.:tuning:barney]] | ||
+ | * [[obstime]] estimate | ||
+ | * [[http://cso.caltech.edu/atm/tuning.html|Receiver tuning diagram]] | ||
+ | * [[calibration]] | ||
+ | |||
+ | * [[http://www.submm.caltech.edu/cso/receivers/|Existing and New Balanced Receiver Development]] | ||
+ | * [[http://www.submm.caltech.edu/cso/receivers/instructions.html|Tuning Instructions]] (Narrow band sidecab and 850 GHz receivers) | ||
+ | * [[http://www.submm.caltech.edu/cso/receivers/beams.html|CSO Beam Efficiency Measurements]] | ||
+ | |||
+ | === Maintenance === | ||
+ | |||
+ | * [[cryogenfills]] | ||
+ | |||
+ | ===== Spectrometers ===== | ||
+ | |||
+ | ^ ID ^ //N//<sub>chan</sub> ^ spacing ^ BW ^Remarks ^ | ||
+ | | || [kHz] | [GHz] | | | ||
+ | | ||||| | ||
+ | | [[FFTS1|FFTS1]] | 8192 | 61 | 0.5 |tunable across 4-8 GHz IF | | ||
+ | | ::: | ::: | 122 | 1 |::: | | ||
+ | | [[FFTS2|FFTS2]] | 4 x 8192 | 268.6 | 4 x 2 | | | ||
+ | | [[AOS5|AOS5]] | 4 x 2048 | 650 | 4 x 1 |four overlapping sections, 4 GHz usable BW | | ||
+ | |||
+ | * [[FFTS1]] \\ Available with all receivers. | ||
+ | * [[FFTS2]] \\ Only available with the wide band (4-8 GHz) receivers. | ||
+ | * [[AOS5]] \\ Only available with the narrow band (1-2 GHz) 345 GHz and 650 GHz sidecab receivers, the 850 GHz receiver, and the wide band (4-8 GHz) 345 GHz receiver (Barney). | ||
+ | |