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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).
 +  ​
cso/instruments/heterodyne/heterodyne.txt · Last modified: 2014-05-07 22:54 by sradford
 
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