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CBH Gregorian Dome Receiver Log

as of Tuesday, 13-May-2008 04:10:02 AST

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***Note:*** if you were directed here from the Receiver Tsys page because the system temperature was high, please note that when the receiver is covered with a manual radar cover, the tsys will read high, although the receiver is OK. Check with the operator if in doubt.


Name Email Date Comment
lswlwray@naic.eduMonday, February 2, 2004 17:13:01Receiver up at test facility, first Trx measurements show 11-12K flat across band.
ansanolla@naic.eduWednesday, March 3, 2004 16:03:20System installed upstairs on 2/20/2004. It's Tsys is chann A 24 ēk and chann B is 28 ēk.
ansanolla@naic.eduMonday, March 8, 2004 14:19:48The remote cryotemp reading was hooked up to pos # 6 (former LBN one). The diodes order have to be fix because the 70 diode is hooked to the 16 deg stage and viceversa the 16 deg diode is at 70 deg stage.
ansanolla@naic.eduTuesday, March 9, 2004 13:02:25Dewar shimms added to Dewar , no change to focal point. They are 16" high.
ansanolla@naic.eduWednesday, March 17, 2004 13:35:13Diodes D102 & D502 on bias board been replaced by LED's.
lswlwray@naic.eduThursday, June 10, 2004 16:20:12Moving helium lines around in the cable wrap to reduce twistyness... receiver was off for ~5 minutes around 10am... recovered well.
lswlwray@naic.eduTuesday, June 15, 2004 08:25:24June 14: Dual beam radar causes the temp monitor data to go crazy, much more than the other receivers. Something is much more sensitive in this receiver.
ansanolla@naic.eduFriday, July 2, 2004 11:34:52System down due to power shut down (main power line shorted at the rotary joint).
ansanolla@naic.eduSaturday, July 3, 2004 16:33:18System been cooled.
ansanolla@naic.eduTuesday, July 6, 2004 10:47:19System back to normal after the power emegency on Friday. Vac valve was closed this morning.
ansanolla@naic.eduThursday, July 29, 2004 16:13:16Protective shutter on it.It increases the T Sys.
ansanolla@naic.eduFriday, August 13, 2004 14:47:24CBH shutter on .
ansanolla@naic.eduMonday, August 23, 2004 12:55:26Shutter removed.
ansanolla@naic.eduTuesday, August 31, 2004 20:03:44Automatic shutter installed today at AST 11:30.
ansanolla@naic.eduWednesday, September 22, 2004 13:06:26The shutter was formaly installed today , it first try was on August but had problems on it.
ansanolla@naic.eduThursday, September 30, 2004 14:35:28CBH shutter motor shorted out. It was causing that other shutters wont close. So motor removed in order to replace it, shutter closed by hand. Receiver on schedule for 10/8/2004.
ansanolla@naic.eduMonday, October 11, 2004 15:59:11System was down due to power failure on Saturday , was cooled down by BG and Ganesh.
ansanolla@naic.eduWednesday, November 24, 2004 13:16:44Bias & post amp chassis are off , pin pointing an rfi of 60 Mhz produced localy.
ansanolla@naic.eduMonday, November 29, 2004 13:36:22Bias & post amp boxes on again , when units are off they load cal select ckt. preventing them from changing.
ansanolla@naic.eduTuesday, November 30, 2004 14:31:45The calibration system was not working properly in all the receivers at the Dome . It was due that the post amp chassis for the CBH and XB were off. These was loading the other recvrs calibrators.
ansanolla@naic.eduTuesday, December 21, 2004 08:37:23DB 15 & 25 control cables removed from receiver for rfi test by JRV & CR.
ansanolla@naic.eduTuesday, January 4, 2005 15:51:00System down until further notice.
ansanolla@naic.eduThursday, January 13, 2005 12:55:10System been cooled ,cryocomp ED 010 tie up again with system.
ansanolla@naic.eduFriday, January 14, 2005 11:41:45System cooled. Its cryocomp found with a supply preassure of 240 , charged to 270. Keep an eye on it.
ansanolla@naic.eduFriday, January 14, 2005 11:51:07Forgot to mention that the crosshead was replaced due that the one in broke the motor shaft when it was stuck.It was done in 1/13/2005.
ansanolla@naic.eduWednesday, January 19, 2005 16:04:35Last entry not valid. It belongs to the XB reveiver.
ansanolla@naic.eduThursday, January 20, 2005 12:54:34Noise injection board modified ( to avoid oscillations ,in the SBL it was causing a 60 Mhz interference).Also TTL cal driver board modified (10K resistor at input for a low in condition ).
crvcrios@naic.eduMonday, March 21, 2005 15:49:37Mux board bypass removed and the mux board was reconected.
ansanolla@naic.eduTuesday, March 22, 2005 14:23:00The mux board removed again due to suspicius rfi at the LBW receiver. Its mux board is a no modified one.
ansanolla@naic.eduMonday, May 23, 2005 15:38:22Channel B coax cable from Dewar to cabinet was smash.Replaced.
W. Genterwgenter@naic.eduMonday, August 1, 2005 09:40:04Receiver warmed up on July 29, 2005 due to power dip and compressor failure to restart. Recooled the receiver on the same day.
W. Genterwgenter@naic.eduMonday, August 1, 2005 10:04:14Previous entry for SB High receiver.
ansanolla@naic.eduThursday, August 4, 2005 16:17:44Channel A rf cable(5 ft. long) between Dewar 7 post amp bad, replaced with spare one.Also channel B rf cable (12 ft. long) between post amp & RF cabinet was bad.
ansanolla@naic.eduFriday, August 26, 2005 13:07:48Due to power failure on 8/25/2005 system warmed up.
ansanolla@naic.eduTuesday, August 30, 2005 15:44:28System been cooled. 3 vac pumps on it.
ansanolla@naic.eduWednesday, August 31, 2005 15:44:19System back to normal.
W. Genterwgenter@naic.eduFriday, October 14, 2005 09:07:25Last evening the shutter would not fully open or close. The motor (brushes) caused broadband RFI in all the receivers. When the shutters were commanded to close, the motor timed out and the RFI vanished. On the command to open the shutter, the motor ran continusly. The shutter motor power was removed and the shutter closed and secured.
W. Genterwgenter@naic.eduWednesday, July 26, 2006 16:26:39Two PAMTECH Isolators arrived today. Still waiting on the Mac Tech directional couplers.
ansanolla@naic.eduFriday, August 11, 2006 14:21:35The cryo comp ED 014 has a leak on it.CR & VN working on it.
W. Genterwgenter@naic.eduWednesday, August 16, 2006 07:53:55Mac Tech directional couplers have been received.
ansanolla@naic.eduTuesday, December 5, 2006 13:23:56System cryo down in order to use its cryo comp & lines with the XB/SBN receivers.
crvcrios@naic.eduTuesday, December 12, 2006 13:21:12System satrting to cool down with it's original compresor and lines.
ansanolla@naic.eduThursday, December 14, 2006 16:19:09System back to normal.Own cryo comp & lines.
ansanolla@naic.eduWednesday, January 17, 2007 13:18:50Cryo system shut off in order to use its cryo comp (ED 010) for feeding the LBW cryo system ,LBW cryo comp (ED 007) cooling fan failed.
ansanolla@naic.eduFriday, February 2, 2007 11:28:36Cryo comp ED 010 back to it , it was with the LBW cryo system due to an emergency. Cool down started.
ansanolla@naic.eduMonday, February 5, 2007 11:25:56Dewar vac valve closed. System back to normal.
ansanolla@naic.eduTuesday, April 24, 2007 10:45:20System down due to painting project.
ansanolla@naic.eduWednesday, April 25, 2007 13:00:59The system cryo comp ( ED010) was taken down for service.
ansanolla@naic.eduMonday, May 7, 2007 10:23:42New power supplies added to the bias box (15 vdc for bias was replaced by an Acopian 15DB-30 , it was Lamda one ). Also an Acopian 5EB50 was added to supply the 5 vdc for the digital ckts , they were supplied from the Post amp chassis.The power sw for the bias box was replaced for a locking type one to avoid accidental turn off. The Post amp box power sw was also replaced with a locking type to avoid accidental turn off.
CRVcrios@naic.eduWednesday, January 2, 2008 14:25:19Vacuum pump connected at dewar and is pumping.


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